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scylladb/test/boost/tablets_test.cc
Botond Dénes 35da9551fb Merge 'storage_service: Add describe_ring support for tablet table' from Asias He 
The table query param is added to get the describe_ring result for a
given table.

Both vnode table and tablet table can use this table param, so it is
easier for users to user.

If the table param is not provided by user and the keyspace contains
tablet table, the request will be rejected.

E.g.,
curl "http://127.0.0.1:10000/storage_service/describe_ring/system_auth?table=roles"
curl "http://127.0.0.1:10000/storage_service/describe_ring/ks1?table=standard1"

Refs #16509

Closes scylladb/scylladb#17118

* github.com:scylladb/scylladb:
  tablets: Convert to use the new version of for_each_tablet
  storage_service: Add describe_ring support for tablet table
  storage_service: Mark host2ip as const
  tablets: Add for_each_tablet_gently
2024-02-07 10:41:36 +02:00

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/*
* Copyright (C) 2023-present-2020 ScyllaDB
*/
/*
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#include "test/lib/scylla_test_case.hh"
#include "test/lib/random_utils.hh"
#include <seastar/testing/thread_test_case.hh>
#include "test/lib/cql_test_env.hh"
#include "test/lib/log.hh"
#include "db/config.hh"
#include "schema/schema_builder.hh"
#include "replica/tablets.hh"
#include "replica/tablet_mutation_builder.hh"
#include "locator/tablets.hh"
#include "service/tablet_allocator.hh"
#include "locator/tablet_sharder.hh"
#include "locator/load_sketch.hh"
#include "utils/UUID_gen.hh"
#include "utils/error_injection.hh"
using namespace locator;
using namespace replica;
using namespace service;
static api::timestamp_type current_timestamp(cql_test_env& e) {
// Mutations in system.tablets got there via group0, so in order for new
// mutations to take effect, their timestamp should be "later" than that
return utils::UUID_gen::micros_timestamp(e.get_system_keyspace().local().get_last_group0_state_id().get()) + 1;
}
static utils::UUID next_uuid() {
static uint64_t counter = 1;
return utils::UUID_gen::get_time_UUID(std::chrono::system_clock::time_point(
std::chrono::duration_cast<std::chrono::system_clock::duration>(
std::chrono::seconds(counter++))));
}
static
void verify_tablet_metadata_persistence(cql_test_env& env, const tablet_metadata& tm, api::timestamp_type& ts) {
save_tablet_metadata(env.local_db(), tm, ts++).get();
auto tm2 = read_tablet_metadata(env.local_qp()).get();
BOOST_REQUIRE_EQUAL(tm, tm2);
}
static
cql_test_config tablet_cql_test_config() {
cql_test_config c;
c.db_config->experimental_features({
db::experimental_features_t::feature::TABLETS,
}, db::config::config_source::CommandLine);
c.initial_tablets = 2;
return c;
}
static
future<table_id> add_table(cql_test_env& e) {
auto id = table_id(utils::UUID_gen::get_time_UUID());
co_await e.create_table([id] (std::string_view ks_name) {
return *schema_builder(ks_name, id.to_sstring(), id)
.with_column("p1", utf8_type, column_kind::partition_key)
.with_column("r1", int32_type)
.build();
});
co_return id;
}
SEASTAR_TEST_CASE(test_tablet_metadata_persistence) {
return do_with_cql_env_thread([] (cql_test_env& e) {
auto h1 = host_id(utils::UUID_gen::get_time_UUID());
auto h2 = host_id(utils::UUID_gen::get_time_UUID());
auto h3 = host_id(utils::UUID_gen::get_time_UUID());
auto table1 = add_table(e).get();
auto table2 = add_table(e).get();
auto ts = current_timestamp(e);
{
tablet_metadata tm = read_tablet_metadata(e.local_qp()).get();
// Add table1
{
tablet_map tmap(1);
tmap.set_tablet(tmap.first_tablet(), tablet_info {
tablet_replica_set {
tablet_replica {h1, 0},
tablet_replica {h2, 3},
tablet_replica {h3, 1},
}
});
tm.set_tablet_map(table1, std::move(tmap));
}
verify_tablet_metadata_persistence(e, tm, ts);
// Add table2
{
tablet_map tmap(4);
auto tb = tmap.first_tablet();
tmap.set_tablet(tb, tablet_info {
tablet_replica_set {
tablet_replica {h1, 0},
}
});
tb = *tmap.next_tablet(tb);
tmap.set_tablet(tb, tablet_info {
tablet_replica_set {
tablet_replica {h3, 3},
}
});
tb = *tmap.next_tablet(tb);
tmap.set_tablet(tb, tablet_info {
tablet_replica_set {
tablet_replica {h2, 2},
}
});
tb = *tmap.next_tablet(tb);
tmap.set_tablet(tb, tablet_info {
tablet_replica_set {
tablet_replica {h1, 1},
}
});
tm.set_tablet_map(table2, std::move(tmap));
}
verify_tablet_metadata_persistence(e, tm, ts);
// Increase RF of table2
{
auto&& tmap = tm.get_tablet_map(table2);
auto tb = tmap.first_tablet();
tb = *tmap.next_tablet(tb);
tmap.set_tablet_transition_info(tb, tablet_transition_info{
tablet_transition_stage::allow_write_both_read_old,
tablet_transition_kind::migration,
tablet_replica_set {
tablet_replica {h3, 3},
tablet_replica {h1, 7},
},
tablet_replica {h1, 7}
});
tb = *tmap.next_tablet(tb);
tmap.set_tablet_transition_info(tb, tablet_transition_info{
tablet_transition_stage::use_new,
tablet_transition_kind::migration,
tablet_replica_set {
tablet_replica {h1, 4},
tablet_replica {h2, 2},
},
tablet_replica {h1, 4},
session_id(utils::UUID_gen::get_time_UUID())
});
}
verify_tablet_metadata_persistence(e, tm, ts);
// Reduce tablet count in table2
{
tablet_map tmap(2);
auto tb = tmap.first_tablet();
tmap.set_tablet(tb, tablet_info {
tablet_replica_set {
tablet_replica {h1, 0},
}
});
tb = *tmap.next_tablet(tb);
tmap.set_tablet(tb, tablet_info {
tablet_replica_set {
tablet_replica {h3, 3},
}
});
tm.set_tablet_map(table2, std::move(tmap));
}
verify_tablet_metadata_persistence(e, tm, ts);
// Reduce RF for table1, increasing tablet count
{
tablet_map tmap(2);
auto tb = tmap.first_tablet();
tmap.set_tablet(tb, tablet_info {
tablet_replica_set {
tablet_replica {h3, 7},
}
});
tb = *tmap.next_tablet(tb);
tmap.set_tablet(tb, tablet_info {
tablet_replica_set {
tablet_replica {h1, 3},
}
});
tm.set_tablet_map(table1, std::move(tmap));
}
verify_tablet_metadata_persistence(e, tm, ts);
// Reduce tablet count for table1
{
tablet_map tmap(1);
auto tb = tmap.first_tablet();
tmap.set_tablet(tb, tablet_info {
tablet_replica_set {
tablet_replica {h1, 3},
}
});
tm.set_tablet_map(table1, std::move(tmap));
}
verify_tablet_metadata_persistence(e, tm, ts);
// Change replica of table1
{
tablet_map tmap(1);
auto tb = tmap.first_tablet();
tmap.set_tablet(tb, tablet_info {
tablet_replica_set {
tablet_replica {h3, 7},
}
});
tm.set_tablet_map(table1, std::move(tmap));
}
verify_tablet_metadata_persistence(e, tm, ts);
// Change resize decision of table1
{
tablet_map tmap(1);
locator::resize_decision decision;
decision.way = locator::resize_decision::split{},
decision.sequence_number = 1;
tmap.set_resize_decision(decision);
tm.set_tablet_map(table1, std::move(tmap));
}
verify_tablet_metadata_persistence(e, tm, ts);
}
}, tablet_cql_test_config());
}
SEASTAR_TEST_CASE(test_get_shard) {
return do_with_cql_env_thread([] (cql_test_env& e) {
auto h1 = host_id(utils::UUID_gen::get_time_UUID());
auto h2 = host_id(utils::UUID_gen::get_time_UUID());
auto h3 = host_id(utils::UUID_gen::get_time_UUID());
auto table1 = table_id(utils::UUID_gen::get_time_UUID());
tablet_metadata tm;
tablet_id tid(0);
tablet_id tid1(0);
{
tablet_map tmap(2);
tid = tmap.first_tablet();
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {h1, 0},
tablet_replica {h3, 5},
}
});
tid1 = *tmap.next_tablet(tid);
tmap.set_tablet(tid1, tablet_info {
tablet_replica_set {
tablet_replica {h1, 2},
tablet_replica {h3, 1},
}
});
tmap.set_tablet_transition_info(tid, tablet_transition_info {
tablet_transition_stage::allow_write_both_read_old,
tablet_transition_kind::migration,
tablet_replica_set {
tablet_replica {h1, 0},
tablet_replica {h2, 3},
},
tablet_replica {h2, 3}
});
tm.set_tablet_map(table1, std::move(tmap));
}
auto&& tmap = tm.get_tablet_map(table1);
BOOST_REQUIRE_EQUAL(tmap.get_shard(tid1, h1), std::make_optional(shard_id(2)));
BOOST_REQUIRE(!tmap.get_shard(tid1, h2));
BOOST_REQUIRE_EQUAL(tmap.get_shard(tid1, h3), std::make_optional(shard_id(1)));
BOOST_REQUIRE_EQUAL(tmap.get_shard(tid, h1), std::make_optional(shard_id(0)));
BOOST_REQUIRE_EQUAL(tmap.get_shard(tid, h2), std::make_optional(shard_id(3)));
BOOST_REQUIRE_EQUAL(tmap.get_shard(tid, h3), std::make_optional(shard_id(5)));
}, tablet_cql_test_config());
}
SEASTAR_TEST_CASE(test_mutation_builder) {
return do_with_cql_env_thread([] (cql_test_env& e) {
auto h1 = host_id(utils::UUID_gen::get_time_UUID());
auto h2 = host_id(utils::UUID_gen::get_time_UUID());
auto h3 = host_id(utils::UUID_gen::get_time_UUID());
auto table1 = add_table(e).get();
auto ts = current_timestamp(e);
tablet_metadata tm;
tablet_id tid(0);
tablet_id tid1(0);
{
tablet_map tmap(2);
tid = tmap.first_tablet();
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {h1, 0},
tablet_replica {h3, 5},
}
});
tid1 = *tmap.next_tablet(tid);
tmap.set_tablet(tid1, tablet_info {
tablet_replica_set {
tablet_replica {h1, 2},
tablet_replica {h3, 1},
}
});
tm.set_tablet_map(table1, std::move(tmap));
}
save_tablet_metadata(e.local_db(), tm, ts++).get();
{
tablet_mutation_builder b(ts++, table1);
auto last_token = tm.get_tablet_map(table1).get_last_token(tid1);
b.set_new_replicas(last_token, tablet_replica_set {
tablet_replica {h1, 2},
tablet_replica {h2, 3},
});
b.set_stage(last_token, tablet_transition_stage::write_both_read_new);
b.set_transition(last_token, tablet_transition_kind::migration);
e.local_db().apply({freeze(b.build())}, db::no_timeout).get();
}
{
tablet_map expected_tmap(2);
tid = expected_tmap.first_tablet();
expected_tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {h1, 0},
tablet_replica {h3, 5},
}
});
tid1 = *expected_tmap.next_tablet(tid);
expected_tmap.set_tablet(tid1, tablet_info {
tablet_replica_set {
tablet_replica {h1, 2},
tablet_replica {h3, 1},
}
});
expected_tmap.set_tablet_transition_info(tid1, tablet_transition_info {
tablet_transition_stage::write_both_read_new,
tablet_transition_kind::migration,
tablet_replica_set {
tablet_replica {h1, 2},
tablet_replica {h2, 3},
},
tablet_replica {h2, 3}
});
auto tm_from_disk = read_tablet_metadata(e.local_qp()).get();
BOOST_REQUIRE_EQUAL(expected_tmap, tm_from_disk.get_tablet_map(table1));
}
{
tablet_mutation_builder b(ts++, table1);
auto last_token = tm.get_tablet_map(table1).get_last_token(tid1);
b.set_stage(last_token, tablet_transition_stage::use_new);
b.set_transition(last_token, tablet_transition_kind::migration);
e.local_db().apply({freeze(b.build())}, db::no_timeout).get();
}
{
tablet_map expected_tmap(2);
tid = expected_tmap.first_tablet();
expected_tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {h1, 0},
tablet_replica {h3, 5},
}
});
tid1 = *expected_tmap.next_tablet(tid);
expected_tmap.set_tablet(tid1, tablet_info {
tablet_replica_set {
tablet_replica {h1, 2},
tablet_replica {h3, 1},
}
});
expected_tmap.set_tablet_transition_info(tid1, tablet_transition_info {
tablet_transition_stage::use_new,
tablet_transition_kind::migration,
tablet_replica_set {
tablet_replica {h1, 2},
tablet_replica {h2, 3},
},
tablet_replica {h2, 3}
});
auto tm_from_disk = read_tablet_metadata(e.local_qp()).get();
BOOST_REQUIRE_EQUAL(expected_tmap, tm_from_disk.get_tablet_map(table1));
}
{
tablet_mutation_builder b(ts++, table1);
auto last_token = tm.get_tablet_map(table1).get_last_token(tid1);
b.set_replicas(last_token, tablet_replica_set {
tablet_replica {h1, 2},
tablet_replica {h2, 3},
});
b.del_transition(last_token);
e.local_db().apply({freeze(b.build())}, db::no_timeout).get();
}
{
tablet_map expected_tmap(2);
tid = expected_tmap.first_tablet();
expected_tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {h1, 0},
tablet_replica {h3, 5},
}
});
tid1 = *expected_tmap.next_tablet(tid);
expected_tmap.set_tablet(tid1, tablet_info {
tablet_replica_set {
tablet_replica {h1, 2},
tablet_replica {h2, 3},
}
});
auto tm_from_disk = read_tablet_metadata(e.local_qp()).get();
BOOST_REQUIRE_EQUAL(expected_tmap, tm_from_disk.get_tablet_map(table1));
}
static const auto resize_decision = locator::resize_decision("split", 1);
{
tablet_mutation_builder b(ts++, table1);
auto last_token = tm.get_tablet_map(table1).get_last_token(tid1);
b.set_replicas(last_token, tablet_replica_set {
tablet_replica {h1, 2},
tablet_replica {h2, 3},
});
b.del_transition(last_token);
b.set_resize_decision(resize_decision);
e.local_db().apply({freeze(b.build())}, db::no_timeout).get();
}
{
tablet_map expected_tmap(2);
tid = expected_tmap.first_tablet();
expected_tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {h1, 0},
tablet_replica {h3, 5},
}
});
tid1 = *expected_tmap.next_tablet(tid);
expected_tmap.set_tablet(tid1, tablet_info {
tablet_replica_set {
tablet_replica {h1, 2},
tablet_replica {h2, 3},
}
});
expected_tmap.set_resize_decision(resize_decision);
auto tm_from_disk = read_tablet_metadata(e.local_qp()).get();
BOOST_REQUIRE_EQUAL(expected_tmap, tm_from_disk.get_tablet_map(table1));
}
}, tablet_cql_test_config());
}
SEASTAR_TEST_CASE(test_sharder) {
return do_with_cql_env_thread([] (cql_test_env& e) {
auto h1 = host_id(utils::UUID_gen::get_time_UUID());
auto h2 = host_id(utils::UUID_gen::get_time_UUID());
auto h3 = host_id(utils::UUID_gen::get_time_UUID());
auto table1 = table_id(utils::UUID_gen::get_time_UUID());
token_metadata tokm(token_metadata::config{ .topo_cfg{ .this_host_id = h1 } });
tokm.get_topology().add_or_update_endpoint(h1, tokm.get_topology().my_address());
std::vector<tablet_id> tablet_ids;
{
tablet_map tmap(4);
auto tid = tmap.first_tablet();
tablet_ids.push_back(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {h1, 3},
tablet_replica {h3, 5},
}
});
tid = *tmap.next_tablet(tid);
tablet_ids.push_back(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {h2, 3},
tablet_replica {h3, 1},
}
});
tid = *tmap.next_tablet(tid);
tablet_ids.push_back(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {h3, 2},
tablet_replica {h1, 1},
}
});
tmap.set_tablet_transition_info(tid, tablet_transition_info {
tablet_transition_stage::use_new,
tablet_transition_kind::migration,
tablet_replica_set {
tablet_replica {h1, 1},
tablet_replica {h2, 3},
},
tablet_replica {h2, 3}
});
tid = *tmap.next_tablet(tid);
tablet_ids.push_back(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {h3, 7},
tablet_replica {h2, 3},
}
});
tablet_metadata tm;
tm.set_tablet_map(table1, std::move(tmap));
tokm.set_tablets(std::move(tm));
}
auto& tm = tokm.tablets().get_tablet_map(table1);
tablet_sharder sharder(tokm, table1);
BOOST_REQUIRE_EQUAL(sharder.shard_of(tm.get_last_token(tablet_ids[0])), 3);
BOOST_REQUIRE_EQUAL(sharder.shard_of(tm.get_last_token(tablet_ids[1])), 0); // missing
BOOST_REQUIRE_EQUAL(sharder.shard_of(tm.get_last_token(tablet_ids[2])), 1);
BOOST_REQUIRE_EQUAL(sharder.shard_of(tm.get_last_token(tablet_ids[3])), 0); // missing
BOOST_REQUIRE_EQUAL(sharder.token_for_next_shard(tm.get_last_token(tablet_ids[1]), 0), tm.get_first_token(tablet_ids[3]));
BOOST_REQUIRE_EQUAL(sharder.token_for_next_shard(tm.get_last_token(tablet_ids[1]), 1), tm.get_first_token(tablet_ids[2]));
BOOST_REQUIRE_EQUAL(sharder.token_for_next_shard(tm.get_last_token(tablet_ids[1]), 3), dht::maximum_token());
BOOST_REQUIRE_EQUAL(sharder.token_for_next_shard(tm.get_first_token(tablet_ids[1]), 0), tm.get_first_token(tablet_ids[3]));
BOOST_REQUIRE_EQUAL(sharder.token_for_next_shard(tm.get_first_token(tablet_ids[1]), 1), tm.get_first_token(tablet_ids[2]));
BOOST_REQUIRE_EQUAL(sharder.token_for_next_shard(tm.get_first_token(tablet_ids[1]), 3), dht::maximum_token());
{
auto shard_opt = sharder.next_shard(tm.get_last_token(tablet_ids[0]));
BOOST_REQUIRE(shard_opt);
BOOST_REQUIRE_EQUAL(shard_opt->shard, 0);
BOOST_REQUIRE_EQUAL(shard_opt->token, tm.get_first_token(tablet_ids[1]));
}
{
auto shard_opt = sharder.next_shard(tm.get_last_token(tablet_ids[1]));
BOOST_REQUIRE(shard_opt);
BOOST_REQUIRE_EQUAL(shard_opt->shard, 1);
BOOST_REQUIRE_EQUAL(shard_opt->token, tm.get_first_token(tablet_ids[2]));
}
{
auto shard_opt = sharder.next_shard(tm.get_last_token(tablet_ids[2]));
BOOST_REQUIRE(shard_opt);
BOOST_REQUIRE_EQUAL(shard_opt->shard, 0);
BOOST_REQUIRE_EQUAL(shard_opt->token, tm.get_first_token(tablet_ids[3]));
}
{
auto shard_opt = sharder.next_shard(tm.get_last_token(tablet_ids[3]));
BOOST_REQUIRE(!shard_opt);
}
}, tablet_cql_test_config());
}
SEASTAR_TEST_CASE(test_large_tablet_metadata) {
return do_with_cql_env_thread([] (cql_test_env& e) {
tablet_metadata tm;
auto h1 = host_id(utils::UUID_gen::get_time_UUID());
auto h2 = host_id(utils::UUID_gen::get_time_UUID());
auto h3 = host_id(utils::UUID_gen::get_time_UUID());
const int nr_tables = 1'00;
const int tablets_per_table = 1024;
for (int i = 0; i < nr_tables; ++i) {
tablet_map tmap(tablets_per_table);
for (tablet_id j : tmap.tablet_ids()) {
tmap.set_tablet(j, tablet_info {
tablet_replica_set {{h1, 0}, {h2, 1}, {h3, 2},}
});
}
auto id = add_table(e).get();
tm.set_tablet_map(id, std::move(tmap));
}
auto ts = current_timestamp(e);
verify_tablet_metadata_persistence(e, tm, ts);
}, tablet_cql_test_config());
}
SEASTAR_THREAD_TEST_CASE(test_token_ownership_splitting) {
const auto real_min_token = dht::token(dht::token_kind::key, std::numeric_limits<int64_t>::min() + 1);
const auto real_max_token = dht::token(dht::token_kind::key, std::numeric_limits<int64_t>::max());
for (auto&& tmap : {
tablet_map(1),
tablet_map(2),
tablet_map(4),
tablet_map(16),
tablet_map(1024),
}) {
testlog.debug("tmap: {}", tmap);
BOOST_REQUIRE_EQUAL(real_min_token, tmap.get_first_token(tmap.first_tablet()));
BOOST_REQUIRE_EQUAL(real_max_token, tmap.get_last_token(tmap.last_tablet()));
std::optional<tablet_id> prev_tb;
for (tablet_id tb : tmap.tablet_ids()) {
testlog.debug("first: {}, last: {}", tmap.get_first_token(tb), tmap.get_last_token(tb));
BOOST_REQUIRE_EQUAL(tb, tmap.get_tablet_id(tmap.get_first_token(tb)));
BOOST_REQUIRE_EQUAL(tb, tmap.get_tablet_id(tmap.get_last_token(tb)));
if (prev_tb) {
BOOST_REQUIRE_EQUAL(dht::next_token(tmap.get_last_token(*prev_tb)), tmap.get_first_token(tb));
}
prev_tb = tb;
}
}
}
static
void apply_resize_plan(token_metadata& tm, const migration_plan& plan) {
for (auto [table_id, resize_decision] : plan.resize_plan().resize) {
tablet_map& tmap = tm.tablets().get_tablet_map(table_id);
resize_decision.sequence_number = tmap.resize_decision().sequence_number + 1;
tmap.set_resize_decision(resize_decision);
}
for (auto table_id : plan.resize_plan().finalize_resize) {
auto& old_tmap = tm.tablets().get_tablet_map(table_id);
testlog.info("Setting new tablet map of size {}", old_tmap.tablet_count() * 2);
tablet_map tmap(old_tmap.tablet_count() * 2);
tm.tablets().set_tablet_map(table_id, std::move(tmap));
}
}
// Reflects the plan in a given token metadata as if the migrations were fully executed.
static
void apply_plan(token_metadata& tm, const migration_plan& plan) {
for (auto&& mig : plan.migrations()) {
tablet_map& tmap = tm.tablets().get_tablet_map(mig.tablet.table);
auto tinfo = tmap.get_tablet_info(mig.tablet.tablet);
tinfo.replicas = replace_replica(tinfo.replicas, mig.src, mig.dst);
tmap.set_tablet(mig.tablet.tablet, tinfo);
}
apply_resize_plan(tm, plan);
}
// Reflects the plan in a given token metadata as if the migrations were started but not yet executed.
static
void apply_plan_as_in_progress(token_metadata& tm, const migration_plan& plan) {
for (auto&& mig : plan.migrations()) {
tablet_map& tmap = tm.tablets().get_tablet_map(mig.tablet.table);
auto tinfo = tmap.get_tablet_info(mig.tablet.tablet);
tmap.set_tablet_transition_info(mig.tablet.tablet, migration_to_transition_info(tinfo, mig));
}
apply_resize_plan(tm, plan);
}
static
void rebalance_tablets(tablet_allocator& talloc, shared_token_metadata& stm, locator::load_stats_ptr load_stats = {}) {
while (true) {
auto plan = talloc.balance_tablets(stm.get(), load_stats).get();
if (plan.empty()) {
break;
}
stm.mutate_token_metadata([&] (token_metadata& tm) {
apply_plan(tm, plan);
return make_ready_future<>();
}).get();
}
}
static
void rebalance_tablets_as_in_progress(tablet_allocator& talloc, shared_token_metadata& stm) {
while (true) {
auto plan = talloc.balance_tablets(stm.get()).get();
if (plan.empty()) {
break;
}
stm.mutate_token_metadata([&] (token_metadata& tm) {
apply_plan_as_in_progress(tm, plan);
return make_ready_future<>();
}).get();
}
}
// Completes any in progress tablet migrations.
static
void execute_transitions(shared_token_metadata& stm) {
stm.mutate_token_metadata([&] (token_metadata& tm) {
for (auto&& [tablet, tmap_] : tm.tablets().all_tables()) {
auto& tmap = tmap_;
for (auto&& [tablet, trinfo]: tmap.transitions()) {
auto ti = tmap.get_tablet_info(tablet);
ti.replicas = trinfo.next;
tmap.set_tablet(tablet, ti);
}
tmap.clear_transitions();
}
return make_ready_future<>();
}).get();
}
SEASTAR_THREAD_TEST_CASE(test_load_balancing_with_empty_node) {
do_with_cql_env_thread([] (auto& e) {
// Tests the scenario of bootstrapping a single node
// Verifies that load balancer sees it and moves tablets to that node.
inet_address ip1("192.168.0.1");
inet_address ip2("192.168.0.2");
inet_address ip3("192.168.0.3");
auto host1 = host_id(next_uuid());
auto host2 = host_id(next_uuid());
auto host3 = host_id(next_uuid());
auto table1 = table_id(next_uuid());
unsigned shard_count = 2;
semaphore sem(1);
shared_token_metadata stm([&sem] () noexcept { return get_units(sem, 1); }, locator::token_metadata::config{
locator::topology::config{
.this_endpoint = ip1,
.local_dc_rack = locator::endpoint_dc_rack::default_location
}
});
stm.mutate_token_metadata([&] (token_metadata& tm) {
tm.update_host_id(host1, ip1);
tm.update_host_id(host2, ip2);
tm.update_host_id(host3, ip3);
tm.update_topology(host1, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tm.update_topology(host2, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tm.update_topology(host3, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tablet_map tmap(4);
auto tid = tmap.first_tablet();
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 0},
tablet_replica {host2, 1},
}
});
tid = *tmap.next_tablet(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 0},
tablet_replica {host2, 1},
}
});
tid = *tmap.next_tablet(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 0},
tablet_replica {host2, 0},
}
});
tid = *tmap.next_tablet(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 1},
tablet_replica {host2, 0},
}
});
tablet_metadata tmeta;
tmeta.set_tablet_map(table1, std::move(tmap));
tm.set_tablets(std::move(tmeta));
return make_ready_future<>();
}).get();
// Sanity check
{
load_sketch load(stm.get());
load.populate().get();
BOOST_REQUIRE_EQUAL(load.get_load(host1), 4);
BOOST_REQUIRE_EQUAL(load.get_avg_shard_load(host1), 2);
BOOST_REQUIRE_EQUAL(load.get_load(host2), 4);
BOOST_REQUIRE_EQUAL(load.get_avg_shard_load(host2), 2);
BOOST_REQUIRE_EQUAL(load.get_load(host3), 0);
BOOST_REQUIRE_EQUAL(load.get_avg_shard_load(host3), 0);
}
rebalance_tablets(e.get_tablet_allocator().local(), stm);
{
load_sketch load(stm.get());
load.populate().get();
for (auto h : {host1, host2, host3}) {
testlog.debug("Checking host {}", h);
BOOST_REQUIRE(load.get_load(h) <= 3);
BOOST_REQUIRE(load.get_load(h) > 1);
BOOST_REQUIRE(load.get_avg_shard_load(h) <= 2);
BOOST_REQUIRE(load.get_avg_shard_load(h) > 0);
}
}
}).get();
}
SEASTAR_THREAD_TEST_CASE(test_decommission_rf_met) {
// Verifies that load balancer moves tablets out of the decommissioned node.
// The scenario is such that replication factor of tablets can be satisfied after decommission.
do_with_cql_env_thread([](auto& e) {
inet_address ip1("192.168.0.1");
inet_address ip2("192.168.0.2");
inet_address ip3("192.168.0.3");
auto host1 = host_id(next_uuid());
auto host2 = host_id(next_uuid());
auto host3 = host_id(next_uuid());
auto table1 = table_id(next_uuid());
semaphore sem(1);
shared_token_metadata stm([&sem]() noexcept { return get_units(sem, 1); }, locator::token_metadata::config {
locator::topology::config {
.this_endpoint = ip1,
.local_dc_rack = locator::endpoint_dc_rack::default_location
}
});
stm.mutate_token_metadata([&](token_metadata& tm) {
const unsigned shard_count = 2;
tm.update_host_id(host1, ip1);
tm.update_host_id(host2, ip2);
tm.update_host_id(host3, ip3);
tm.update_topology(host1, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tm.update_topology(host2, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tm.update_topology(host3, locator::endpoint_dc_rack::default_location, node::state::being_decommissioned,
shard_count);
tablet_map tmap(4);
auto tid = tmap.first_tablet();
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 0},
tablet_replica {host2, 1},
}
});
tid = *tmap.next_tablet(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 0},
tablet_replica {host2, 1},
}
});
tid = *tmap.next_tablet(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 0},
tablet_replica {host3, 0},
}
});
tid = *tmap.next_tablet(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host2, 1},
tablet_replica {host3, 1},
}
});
tablet_metadata tmeta;
tmeta.set_tablet_map(table1, std::move(tmap));
tm.set_tablets(std::move(tmeta));
return make_ready_future<>();
}).get();
rebalance_tablets(e.get_tablet_allocator().local(), stm);
{
load_sketch load(stm.get());
load.populate().get();
BOOST_REQUIRE(load.get_avg_shard_load(host1) == 2);
BOOST_REQUIRE(load.get_avg_shard_load(host2) == 2);
BOOST_REQUIRE(load.get_avg_shard_load(host3) == 0);
}
stm.mutate_token_metadata([&](token_metadata& tm) {
tm.update_topology(host3, locator::endpoint_dc_rack::default_location, node::state::left);
return make_ready_future<>();
}).get();
rebalance_tablets(e.get_tablet_allocator().local(), stm);
{
load_sketch load(stm.get());
load.populate().get();
BOOST_REQUIRE(load.get_avg_shard_load(host1) == 2);
BOOST_REQUIRE(load.get_avg_shard_load(host2) == 2);
BOOST_REQUIRE(load.get_avg_shard_load(host3) == 0);
}
}).get();
}
SEASTAR_THREAD_TEST_CASE(test_decommission_two_racks) {
// Verifies that load balancer moves tablets out of the decommissioned node.
// The scenario is such that replication constraints of tablets can be satisfied after decommission.
do_with_cql_env_thread([](auto& e) {
inet_address ip1("192.168.0.1");
inet_address ip2("192.168.0.2");
inet_address ip3("192.168.0.3");
inet_address ip4("192.168.0.4");
auto host1 = host_id(next_uuid());
auto host2 = host_id(next_uuid());
auto host3 = host_id(next_uuid());
auto host4 = host_id(next_uuid());
std::vector<endpoint_dc_rack> racks = {
endpoint_dc_rack{ "dc1", "rack-1" },
endpoint_dc_rack{ "dc1", "rack-2" }
};
auto table1 = table_id(next_uuid());
semaphore sem(1);
shared_token_metadata stm([&sem]() noexcept { return get_units(sem, 1); }, locator::token_metadata::config {
locator::topology::config {
.this_endpoint = ip1,
.local_dc_rack = racks[0]
}
});
stm.mutate_token_metadata([&](token_metadata& tm) {
const unsigned shard_count = 1;
tm.update_host_id(host1, ip1);
tm.update_host_id(host2, ip2);
tm.update_host_id(host3, ip3);
tm.update_host_id(host4, ip4);
tm.update_topology(host1, racks[0], std::nullopt, shard_count);
tm.update_topology(host2, racks[1], std::nullopt, shard_count);
tm.update_topology(host3, racks[0], std::nullopt, shard_count);
tm.update_topology(host4, racks[1], node::state::being_decommissioned,
shard_count);
tablet_map tmap(4);
auto tid = tmap.first_tablet();
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 0},
tablet_replica {host2, 0},
}
});
tid = *tmap.next_tablet(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host2, 0},
tablet_replica {host3, 0},
}
});
tid = *tmap.next_tablet(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host3, 0},
tablet_replica {host4, 0},
}
});
tid = *tmap.next_tablet(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 0},
tablet_replica {host2, 0},
}
});
tablet_metadata tmeta;
tmeta.set_tablet_map(table1, std::move(tmap));
tm.set_tablets(std::move(tmeta));
return make_ready_future<>();
}).get();
rebalance_tablets(e.get_tablet_allocator().local(), stm);
{
load_sketch load(stm.get());
load.populate().get();
BOOST_REQUIRE(load.get_avg_shard_load(host1) >= 2);
BOOST_REQUIRE(load.get_avg_shard_load(host2) >= 2);
BOOST_REQUIRE(load.get_avg_shard_load(host3) >= 2);
BOOST_REQUIRE(load.get_avg_shard_load(host4) == 0);
}
// Verify replicas are not collocated on racks
{
auto tm = stm.get();
auto& tmap = tm->tablets().get_tablet_map(table1);
tmap.for_each_tablet([&](auto tid, auto& tinfo) -> future<> {
auto rack1 = tm->get_topology().get_rack(tinfo.replicas[0].host);
auto rack2 = tm->get_topology().get_rack(tinfo.replicas[1].host);
BOOST_REQUIRE(rack1 != rack2);
co_return;
}).get();
}
}).get();
}
SEASTAR_THREAD_TEST_CASE(test_decommission_rack_load_failure) {
// Verifies that load balancer moves tablets out of the decommissioned node.
// The scenario is such that it is impossible to distribute replicas without violating rack uniqueness.
do_with_cql_env_thread([](auto& e) {
inet_address ip1("192.168.0.1");
inet_address ip2("192.168.0.2");
inet_address ip3("192.168.0.3");
inet_address ip4("192.168.0.4");
auto host1 = host_id(next_uuid());
auto host2 = host_id(next_uuid());
auto host3 = host_id(next_uuid());
auto host4 = host_id(next_uuid());
std::vector<endpoint_dc_rack> racks = {
endpoint_dc_rack{ "dc1", "rack-1" },
endpoint_dc_rack{ "dc1", "rack-2" }
};
auto table1 = table_id(next_uuid());
semaphore sem(1);
shared_token_metadata stm([&sem]() noexcept { return get_units(sem, 1); }, locator::token_metadata::config {
locator::topology::config {
.this_endpoint = ip1,
.local_dc_rack = racks[0]
}
});
stm.mutate_token_metadata([&](token_metadata& tm) {
const unsigned shard_count = 1;
tm.update_host_id(host1, ip1);
tm.update_host_id(host2, ip2);
tm.update_host_id(host3, ip3);
tm.update_host_id(host4, ip4);
tm.update_topology(host1, racks[0], std::nullopt, shard_count);
tm.update_topology(host2, racks[0], std::nullopt, shard_count);
tm.update_topology(host3, racks[0], std::nullopt, shard_count);
tm.update_topology(host4, racks[1], node::state::being_decommissioned,
shard_count);
tablet_map tmap(4);
auto tid = tmap.first_tablet();
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 0},
tablet_replica {host4, 0},
}
});
tid = *tmap.next_tablet(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host2, 0},
tablet_replica {host4, 0},
}
});
tid = *tmap.next_tablet(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host3, 0},
tablet_replica {host4, 0},
}
});
tid = *tmap.next_tablet(tid);
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 0},
tablet_replica {host4, 0},
}
});
tablet_metadata tmeta;
tmeta.set_tablet_map(table1, std::move(tmap));
tm.set_tablets(std::move(tmeta));
return make_ready_future<>();
}).get();
BOOST_REQUIRE_THROW(rebalance_tablets(e.get_tablet_allocator().local(), stm), std::runtime_error);
}).get();
}
SEASTAR_THREAD_TEST_CASE(test_decommission_rf_not_met) {
// Verifies that load balancer moves tablets out of the decommissioned node.
// The scenario is such that replication factor of tablets can be satisfied after decommission.
do_with_cql_env_thread([](auto& e) {
inet_address ip1("192.168.0.1");
inet_address ip2("192.168.0.2");
inet_address ip3("192.168.0.3");
auto host1 = host_id(next_uuid());
auto host2 = host_id(next_uuid());
auto host3 = host_id(next_uuid());
auto table1 = table_id(next_uuid());
semaphore sem(1);
shared_token_metadata stm([&sem]() noexcept { return get_units(sem, 1); }, locator::token_metadata::config {
locator::topology::config {
.this_endpoint = ip1,
.local_dc_rack = locator::endpoint_dc_rack::default_location
}
});
stm.mutate_token_metadata([&](token_metadata& tm) {
const unsigned shard_count = 2;
tm.update_host_id(host1, ip1);
tm.update_host_id(host2, ip2);
tm.update_host_id(host3, ip3);
tm.update_topology(host1, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tm.update_topology(host2, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tm.update_topology(host3, locator::endpoint_dc_rack::default_location, node::state::being_decommissioned,
shard_count);
tablet_map tmap(1);
auto tid = tmap.first_tablet();
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 0},
tablet_replica {host2, 0},
tablet_replica {host3, 0},
}
});
tablet_metadata tmeta;
tmeta.set_tablet_map(table1, std::move(tmap));
tm.set_tablets(std::move(tmeta));
return make_ready_future<>();
}).get();
BOOST_REQUIRE_THROW(rebalance_tablets(e.get_tablet_allocator().local(), stm), std::runtime_error);
}).get();
}
SEASTAR_THREAD_TEST_CASE(test_load_balancing_works_with_in_progress_transitions) {
do_with_cql_env_thread([] (auto& e) {
// Tests the scenario of bootstrapping a single node.
// Verifies that the load balancer balances tablets on that node
// even though there is already an active migration.
// The test verifies that the load balancer creates a plan
// which when executed will achieve perfect balance,
// which is a proof that it doesn't stop due to active migrations.
inet_address ip1("192.168.0.1");
inet_address ip2("192.168.0.2");
inet_address ip3("192.168.0.3");
auto host1 = host_id(next_uuid());
auto host2 = host_id(next_uuid());
auto host3 = host_id(next_uuid());
auto table1 = table_id(next_uuid());
semaphore sem(1);
shared_token_metadata stm([&sem] () noexcept { return get_units(sem, 1); }, locator::token_metadata::config{
locator::topology::config{
.this_endpoint = ip1,
.local_dc_rack = locator::endpoint_dc_rack::default_location
}
});
stm.mutate_token_metadata([&] (token_metadata& tm) {
tm.update_host_id(host1, ip1);
tm.update_host_id(host2, ip2);
tm.update_host_id(host3, ip3);
tm.update_topology(host1, locator::endpoint_dc_rack::default_location, std::nullopt, 1);
tm.update_topology(host2, locator::endpoint_dc_rack::default_location, std::nullopt, 1);
tm.update_topology(host3, locator::endpoint_dc_rack::default_location, std::nullopt, 2);
tablet_map tmap(4);
std::optional<tablet_id> tid = tmap.first_tablet();
for (int i = 0; i < 4; ++i) {
tmap.set_tablet(*tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 0},
tablet_replica {host2, 0},
}
});
tid = tmap.next_tablet(*tid);
}
tmap.set_tablet_transition_info(tmap.first_tablet(), tablet_transition_info {
tablet_transition_stage::allow_write_both_read_old,
tablet_transition_kind::migration,
tablet_replica_set {
tablet_replica {host3, 0},
tablet_replica {host2, 0},
},
tablet_replica {host3, 0}
});
tablet_metadata tmeta;
tmeta.set_tablet_map(table1, std::move(tmap));
tm.set_tablets(std::move(tmeta));
return make_ready_future<>();
}).get();
rebalance_tablets_as_in_progress(e.get_tablet_allocator().local(), stm);
execute_transitions(stm);
{
load_sketch load(stm.get());
load.populate().get();
for (auto h : {host1, host2, host3}) {
testlog.debug("Checking host {}", h);
BOOST_REQUIRE(load.get_avg_shard_load(h) == 2);
}
}
}).get();
}
#ifdef SCYLLA_ENABLE_ERROR_INJECTION
SEASTAR_THREAD_TEST_CASE(test_load_balancer_shuffle_mode) {
do_with_cql_env_thread([] (auto& e) {
inet_address ip1("192.168.0.1");
inet_address ip2("192.168.0.2");
inet_address ip3("192.168.0.3");
auto host1 = host_id(next_uuid());
auto host2 = host_id(next_uuid());
auto host3 = host_id(next_uuid());
auto table1 = table_id(next_uuid());
semaphore sem(1);
shared_token_metadata stm([&sem] () noexcept { return get_units(sem, 1); }, locator::token_metadata::config{
locator::topology::config{
.this_endpoint = ip1,
.local_dc_rack = locator::endpoint_dc_rack::default_location
}
});
stm.mutate_token_metadata([&] (token_metadata& tm) {
tm.update_host_id(host1, ip1);
tm.update_host_id(host2, ip2);
tm.update_host_id(host3, ip3);
tm.update_topology(host1, locator::endpoint_dc_rack::default_location, std::nullopt, 1);
tm.update_topology(host2, locator::endpoint_dc_rack::default_location, std::nullopt, 1);
tm.update_topology(host3, locator::endpoint_dc_rack::default_location, std::nullopt, 2);
tablet_map tmap(4);
std::optional<tablet_id> tid = tmap.first_tablet();
for (int i = 0; i < 4; ++i) {
tmap.set_tablet(*tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 0},
tablet_replica {host2, 0},
}
});
tid = tmap.next_tablet(*tid);
}
tablet_metadata tmeta;
tmeta.set_tablet_map(table1, std::move(tmap));
tm.set_tablets(std::move(tmeta));
return make_ready_future<>();
}).get();
rebalance_tablets(e.get_tablet_allocator().local(), stm);
BOOST_REQUIRE(e.get_tablet_allocator().local().balance_tablets(stm.get()).get().empty());
utils::get_local_injector().enable("tablet_allocator_shuffle");
auto disable_injection = seastar::defer([&] {
utils::get_local_injector().disable("tablet_allocator_shuffle");
});
BOOST_REQUIRE(!e.get_tablet_allocator().local().balance_tablets(stm.get()).get().empty());
}).get();
}
#endif
SEASTAR_THREAD_TEST_CASE(test_load_balancing_with_two_empty_nodes) {
do_with_cql_env_thread([] (auto& e) {
inet_address ip1("192.168.0.1");
inet_address ip2("192.168.0.2");
inet_address ip3("192.168.0.3");
inet_address ip4("192.168.0.4");
auto host1 = host_id(next_uuid());
auto host2 = host_id(next_uuid());
auto host3 = host_id(next_uuid());
auto host4 = host_id(next_uuid());
auto table1 = table_id(next_uuid());
unsigned shard_count = 2;
semaphore sem(1);
shared_token_metadata stm([&sem] () noexcept { return get_units(sem, 1); }, locator::token_metadata::config{
locator::topology::config{
.this_endpoint = ip1,
.local_dc_rack = locator::endpoint_dc_rack::default_location
}
});
stm.mutate_token_metadata([&] (token_metadata& tm) {
tm.update_host_id(host1, ip1);
tm.update_host_id(host2, ip2);
tm.update_host_id(host3, ip3);
tm.update_host_id(host4, ip4);
tm.update_topology(host1, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tm.update_topology(host2, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tm.update_topology(host3, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tm.update_topology(host4, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tablet_map tmap(16);
for (auto tid : tmap.tablet_ids()) {
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, tests::random::get_int<shard_id>(0, shard_count - 1)},
tablet_replica {host2, tests::random::get_int<shard_id>(0, shard_count - 1)},
}
});
}
tablet_metadata tmeta;
tmeta.set_tablet_map(table1, std::move(tmap));
tm.set_tablets(std::move(tmeta));
return make_ready_future<>();
}).get();
rebalance_tablets(e.get_tablet_allocator().local(), stm);
{
load_sketch load(stm.get());
load.populate().get();
for (auto h : {host1, host2, host3, host4}) {
testlog.debug("Checking host {}", h);
BOOST_REQUIRE(load.get_avg_shard_load(h) == 4);
}
}
}).get();
}
SEASTAR_THREAD_TEST_CASE(test_load_balancer_disabling) {
do_with_cql_env_thread([] (auto& e) {
inet_address ip1("192.168.0.1");
inet_address ip2("192.168.0.2");
auto host1 = host_id(next_uuid());
auto host2 = host_id(next_uuid());
auto table1 = table_id(next_uuid());
unsigned shard_count = 1;
semaphore sem(1);
shared_token_metadata stm([&sem] () noexcept { return get_units(sem, 1); }, locator::token_metadata::config{
locator::topology::config{
.this_endpoint = ip1,
.local_dc_rack = locator::endpoint_dc_rack::default_location
}
});
// host1 is loaded and host2 is empty, resulting in an imbalance.
stm.mutate_token_metadata([&] (auto& tm) {
tm.update_host_id(host1, ip1);
tm.update_host_id(host2, ip2);
tm.update_topology(host1, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tm.update_topology(host2, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tablet_map tmap(16);
for (auto tid : tmap.tablet_ids()) {
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, 0},
}
});
}
tablet_metadata tmeta;
tmeta.set_tablet_map(table1, std::move(tmap));
tm.set_tablets(std::move(tmeta));
return make_ready_future<>();
}).get();
{
auto plan = e.get_tablet_allocator().local().balance_tablets(stm.get()).get();
BOOST_REQUIRE(!plan.empty());
}
// Disable load balancing
stm.mutate_token_metadata([&] (token_metadata& tm) {
tm.tablets().set_balancing_enabled(false);
return make_ready_future<>();
}).get();
{
auto plan = e.get_tablet_allocator().local().balance_tablets(stm.get()).get();
BOOST_REQUIRE(plan.empty());
}
// Check that cloning preserves the setting
stm.mutate_token_metadata([&] (token_metadata& tm) {
return make_ready_future<>();
}).get();
{
auto plan = e.get_tablet_allocator().local().balance_tablets(stm.get()).get();
BOOST_REQUIRE(plan.empty());
}
// Enable load balancing back
stm.mutate_token_metadata([&] (token_metadata& tm) {
tm.tablets().set_balancing_enabled(true);
return make_ready_future<>();
}).get();
{
auto plan = e.get_tablet_allocator().local().balance_tablets(stm.get()).get();
BOOST_REQUIRE(!plan.empty());
}
// Check that cloning preserves the setting
stm.mutate_token_metadata([&] (token_metadata& tm) {
return make_ready_future<>();
}).get();
{
auto plan = e.get_tablet_allocator().local().balance_tablets(stm.get()).get();
BOOST_REQUIRE(!plan.empty());
}
}).get();
}
SEASTAR_THREAD_TEST_CASE(test_load_balancing_with_random_load) {
do_with_cql_env_thread([] (auto& e) {
const int n_hosts = 6;
std::vector<host_id> hosts;
for (int i = 0; i < n_hosts; ++i) {
hosts.push_back(host_id(next_uuid()));
}
std::vector<endpoint_dc_rack> racks = {
endpoint_dc_rack{ "dc1", "rack-1" },
endpoint_dc_rack{ "dc1", "rack-2" }
};
for (int i = 0; i < 13; ++i) {
std::unordered_map<sstring, std::vector<host_id>> hosts_by_rack;
semaphore sem(1);
shared_token_metadata stm([&sem]() noexcept { return get_units(sem, 1); }, locator::token_metadata::config {
locator::topology::config {
.this_endpoint = inet_address("192.168.0.1"),
.this_host_id = hosts[0],
.local_dc_rack = racks[1]
}
});
size_t total_tablet_count = 0;
stm.mutate_token_metadata([&](token_metadata& tm) {
tablet_metadata tmeta;
int i = 0;
for (auto h : hosts) {
auto ip = inet_address(format("192.168.0.{}", ++i));
auto shard_count = 2;
tm.update_host_id(h, ip);
auto rack = racks[i % racks.size()];
tm.update_topology(h, rack, std::nullopt, shard_count);
if (h != hosts[0]) {
// Leave the first host empty by making it invisible to allocation algorithm.
hosts_by_rack[rack.rack].push_back(h);
}
}
size_t tablet_count_bits = 8;
int rf = tests::random::get_int<shard_id>(2, 4);
for (size_t log2_tablets = 0; log2_tablets < tablet_count_bits; ++log2_tablets) {
if (tests::random::get_bool()) {
continue;
}
auto table = table_id(next_uuid());
tablet_map tmap(1 << log2_tablets);
for (auto tid : tmap.tablet_ids()) {
// Choose replicas randomly while loading racks evenly.
std::vector<host_id> replica_hosts;
for (int i = 0; i < rf; ++i) {
auto rack = racks[i % racks.size()];
auto& rack_hosts = hosts_by_rack[rack.rack];
while (true) {
auto candidate_host = rack_hosts[tests::random::get_int<shard_id>(0, rack_hosts.size() - 1)];
if (std::find(replica_hosts.begin(), replica_hosts.end(), candidate_host) == replica_hosts.end()) {
replica_hosts.push_back(candidate_host);
break;
}
}
}
tablet_replica_set replicas;
for (auto h : replica_hosts) {
auto shard_count = tm.get_topology().find_node(h)->get_shard_count();
auto shard = tests::random::get_int<shard_id>(0, shard_count - 1);
replicas.push_back(tablet_replica {h, shard});
}
tmap.set_tablet(tid, tablet_info {std::move(replicas)});
}
total_tablet_count += tmap.tablet_count();
tmeta.set_tablet_map(table, std::move(tmap));
}
tm.set_tablets(std::move(tmeta));
return make_ready_future<>();
}).get();
testlog.debug("tablet metadata: {}", stm.get()->tablets());
testlog.info("Total tablet count: {}, hosts: {}", total_tablet_count, hosts.size());
rebalance_tablets(e.get_tablet_allocator().local(), stm);
{
load_sketch load(stm.get());
load.populate().get();
min_max_tracker<unsigned> min_max_load;
for (auto h: hosts) {
auto l = load.get_avg_shard_load(h);
testlog.info("Load on host {}: {}", h, l);
min_max_load.update(l);
}
testlog.debug("tablet metadata: {}", stm.get()->tablets());
testlog.debug("Min load: {}, max load: {}", min_max_load.min(), min_max_load.max());
// FIXME: The algorithm cannot achieve balance in all cases yet, so we only check that it stops.
// For example, if we have an overloaded node in one rack and target underloaded node in a different rack,
// we won't be able to reduce the load gap by moving tablets between the two. We have to balance the overloaded
// rack first, which is unconstrained.
// Uncomment the following line when the algorithm is improved.
// BOOST_REQUIRE(min_max_load.max() - min_max_load.min() <= 1);
}
}
}).get();
}
SEASTAR_TEST_CASE(test_tablet_id_and_range_side) {
static constexpr size_t tablet_count = 128;
locator::tablet_map tmap(tablet_count);
locator::tablet_map tmap_after_splitting(tablet_count * 2);
for (size_t id = 0; id < tablet_count; id++) {
auto left_id = tablet_id(id << 1);
auto right_id = tablet_id(left_id.value() + 1);
auto left_tr = tmap_after_splitting.get_token_range(left_id);
auto right_tr = tmap_after_splitting.get_token_range(right_id);
testlog.debug("id {}, left tr {}, right tr {}", id, left_tr, right_tr);
auto test = [&tmap, id] (dht::token token, tablet_range_side expected_side) {
auto [tid, side] = tmap.get_tablet_id_and_range_side(token);
BOOST_REQUIRE_EQUAL(tid.value(), id);
BOOST_REQUIRE_EQUAL(side, expected_side);
};
auto test_range = [&] (dht::token_range& tr, tablet_range_side expected_side) {
auto lower_token = tr.start()->value() == dht::minimum_token() ? dht::first_token() : tr.start()->value();
auto upper_token = tr.end()->value();
test(next_token(lower_token), expected_side);
test(upper_token, expected_side);
};
// Test the lower and upper bound of tablet's left and right ranges ("compaction groups").
test_range(left_tr, tablet_range_side::left);
test_range(right_tr, tablet_range_side::right);
}
return make_ready_future<>();
}
SEASTAR_THREAD_TEST_CASE(basic_tablet_storage_splitting_test) {
auto cfg = tablet_cql_test_config();
cfg.initial_tablets = std::bit_floor(smp::count);
do_with_cql_env_thread([] (cql_test_env& e) {
e.execute_cql(
"CREATE TABLE cf (pk int, ck int, v int, PRIMARY KEY (pk, ck))").get();
for (unsigned i = 0; i < smp::count * 20; i++) {
e.execute_cql(format("INSERT INTO cf (pk, ck, v) VALUES ({}, 0, 0)", i)).get();
}
e.db().invoke_on_all([] (replica::database& db) {
auto& table = db.find_column_family("ks", "cf");
return table.flush();
}).get();
testlog.info("Splitting sstables...");
e.db().invoke_on_all([] (replica::database& db) {
auto& table = db.find_column_family("ks", "cf");
testlog.info("sstable count: {}", table.sstables_count());
return table.split_all_storage_groups();
}).get();
testlog.info("Verifying sstables are split...");
BOOST_REQUIRE_EQUAL(e.db().map_reduce0([] (replica::database& db) {
auto& table = db.find_column_family("ks", "cf");
return make_ready_future<bool>(table.all_storage_groups_split());
}, bool(false), std::logical_or<bool>()).get(), true);
}, std::move(cfg)).get();
}
SEASTAR_THREAD_TEST_CASE(test_load_balancing_resize_requests) {
do_with_cql_env_thread([] (auto& e) {
inet_address ip1("192.168.0.1");
inet_address ip2("192.168.0.2");
auto host1 = host_id(next_uuid());
auto host2 = host_id(next_uuid());
auto table1 = table_id(next_uuid());
unsigned shard_count = 2;
semaphore sem(1);
shared_token_metadata stm([&sem] () noexcept { return get_units(sem, 1); }, locator::token_metadata::config{
locator::topology::config{
.this_endpoint = ip1,
.local_dc_rack = locator::endpoint_dc_rack::default_location
}
});
stm.mutate_token_metadata([&] (token_metadata& tm) {
tm.update_host_id(host1, ip1);
tm.update_host_id(host2, ip2);
tm.update_topology(host1, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tm.update_topology(host2, locator::endpoint_dc_rack::default_location, std::nullopt, shard_count);
tablet_map tmap(2);
for (auto tid : tmap.tablet_ids()) {
tmap.set_tablet(tid, tablet_info {
tablet_replica_set {
tablet_replica {host1, tests::random::get_int<shard_id>(0, shard_count - 1)},
tablet_replica {host2, tests::random::get_int<shard_id>(0, shard_count - 1)},
}
});
}
tablet_metadata tmeta;
tmeta.set_tablet_map(table1, std::move(tmap));
tm.set_tablets(std::move(tmeta));
return make_ready_future<>();
}).get();
auto tablet_count = [&] {
return stm.get()->tablets().get_tablet_map(table1).tablet_count();
};
auto resize_decision = [&] {
return stm.get()->tablets().get_tablet_map(table1).resize_decision();
};
auto do_rebalance_tablets = [&] (locator::load_stats load_stats) {
rebalance_tablets(e.get_tablet_allocator().local(), stm, make_lw_shared(std::move(load_stats)));
};
const size_t initial_tablets = tablet_count();
const uint64_t max_tablet_size = service::default_target_tablet_size * 2;
auto to_size_in_bytes = [&] (double max_tablet_size_pctg) -> uint64_t {
return (max_tablet_size * max_tablet_size_pctg) * tablet_count();
};
const auto initial_ready_seq_number = std::numeric_limits<locator::resize_decision::seq_number_t>::min();
// there are 2 tablets, each with avg size hitting merge threshold, so merge request is emitted
{
locator::load_stats load_stats = {
.tables = {
{ table1, table_load_stats{ .size_in_bytes = to_size_in_bytes(0.0), .split_ready_seq_number = initial_ready_seq_number }},
}
};
do_rebalance_tablets(std::move(load_stats));
BOOST_REQUIRE(tablet_count() == initial_tablets);
BOOST_REQUIRE(std::holds_alternative<locator::resize_decision::merge>(resize_decision().way));
}
// avg size moved above target size, so merge is cancelled
{
locator::load_stats load_stats = {
.tables = {
{ table1, table_load_stats{ .size_in_bytes = to_size_in_bytes(0.75), .split_ready_seq_number = initial_ready_seq_number }},
}
};
do_rebalance_tablets(std::move(load_stats));
BOOST_REQUIRE(tablet_count() == initial_tablets);
BOOST_REQUIRE(std::holds_alternative<locator::resize_decision::none>(resize_decision().way));
}
// avg size hits split threshold, and balancer emits split request
{
locator::load_stats load_stats = {
.tables = {
{ table1, table_load_stats{ .size_in_bytes = to_size_in_bytes(1.1), .split_ready_seq_number = initial_ready_seq_number }},
}
};
do_rebalance_tablets(std::move(load_stats));
BOOST_REQUIRE(tablet_count() == initial_tablets);
BOOST_REQUIRE(std::holds_alternative<locator::resize_decision::split>(resize_decision().way));
BOOST_REQUIRE(resize_decision().sequence_number > 0);
}
// replicas set their split status as ready, and load balancer finalizes split generating a new
// tablet map, twice as large as the previous one.
{
locator::load_stats load_stats = {
.tables = {
{ table1, table_load_stats{ .size_in_bytes = to_size_in_bytes(1.1), .split_ready_seq_number = resize_decision().sequence_number }},
}
};
do_rebalance_tablets(std::move(load_stats));
BOOST_REQUIRE(tablet_count() == initial_tablets * 2);
BOOST_REQUIRE(std::holds_alternative<locator::resize_decision::none>(resize_decision().way));
}
}).get();
}
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