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4e3b98f281581d8ff5ac36daa29b5bbc19ee324c
scylladb/streaming/stream_session.cc
Asias He 50bf65db8d streaming: Fix keep alive timer progress checking 
When the first time the keep alive timer fires, the _last_stream_bytes
btyes will be zero since it is the first time we update it. The keep
alive timer will be rearmed and fired again. The second time, we find
there is no progress, we close the session. The total idle time will be
2 * keep alive timer.

To make the idle time to close the session be more precise, we reduce
the interval to check the progess and close the session by checking last
time the progress is made.

Message-Id: <c959cffce0cc738a3d73caaf71d2adb709d46863.1456831616.git.asias@scylladb.com>
2016-03-01 16:46:08 +02:00

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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Modified by Cloudius Systems.
* Copyright 2015 Cloudius Systems.
*/
/*
* This file is part of Scylla.
*
* Scylla is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Scylla is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
*/
#include "log.hh"
#include "message/messaging_service.hh"
#include "streaming/stream_session.hh"
#include "streaming/prepare_message.hh"
#include "streaming/stream_result_future.hh"
#include "streaming/stream_manager.hh"
#include "mutation_reader.hh"
#include "dht/i_partitioner.hh"
#include "database.hh"
#include "utils/fb_utilities.hh"
#include "streaming/stream_plan.hh"
#include "core/sleep.hh"
#include "service/storage_service.hh"
#include "core/thread.hh"
#include "cql3/query_processor.hh"
#include "streaming/stream_state.hh"
#include "streaming/stream_session_state.hh"
#include "streaming/stream_exception.hh"
#include "service/storage_proxy.hh"
#include "service/priority_manager.hh"
#include "query-request.hh"
#include "schema_registry.hh"
namespace streaming {
logging::logger sslog("stream_session");
static auto get_stream_result_future(utils::UUID plan_id) {
auto& sm = get_local_stream_manager();
auto f = sm.get_sending_stream(plan_id);
if (!f) {
f = sm.get_receiving_stream(plan_id);
}
return f;
}
static auto get_session(utils::UUID plan_id, gms::inet_address from, const char* verb, std::experimental::optional<utils::UUID> cf_id = {}) {
if (cf_id) {
sslog.debug("[Stream #{}] GOT {} from {}: cf_id={}", plan_id, verb, from, *cf_id);
} else {
sslog.debug("[Stream #{}] GOT {} from {}", plan_id, verb, from);
}
auto sr = get_stream_result_future(plan_id);
if (!sr) {
auto err = sprint("[Stream #%s] GOT %s from %s: Can not find stream_manager", plan_id, verb, from);
sslog.warn(err.c_str());
throw std::runtime_error(err);
}
auto coordinator = sr->get_coordinator();
if (!coordinator) {
auto err = sprint("[Stream #%s] GOT %s from %s: Can not find coordinator", plan_id, verb, from);
sslog.warn(err.c_str());
throw std::runtime_error(err);
}
return coordinator->get_or_create_session(from);
}
void stream_session::init_messaging_service_handler() {
ms().register_prepare_message([] (const rpc::client_info& cinfo, prepare_message msg, UUID plan_id, sstring description) {
const auto& src_cpu_id = cinfo.retrieve_auxiliary<uint32_t>("src_cpu_id");
const auto& from = cinfo.retrieve_auxiliary<gms::inet_address>("baddr");
auto dst_cpu_id = engine().cpu_id();
return smp::submit_to(dst_cpu_id, [msg = std::move(msg), plan_id, description = std::move(description), from, src_cpu_id, dst_cpu_id] () mutable {
auto sr = stream_result_future::init_receiving_side(plan_id, description, from);
auto session = get_session(plan_id, from, "PREPARE_MESSAGE");
session->init(sr);
session->dst_cpu_id = src_cpu_id;
sslog.debug("[Stream #{}] GOT PREPARE_MESSAGE from {}: get session peer={}, dst_cpu_id={}",
session->plan_id(), from, session->peer, session->dst_cpu_id);
return session->prepare(std::move(msg.requests), std::move(msg.summaries));
});
});
ms().register_prepare_done_message([] (const rpc::client_info& cinfo, UUID plan_id, unsigned dst_cpu_id) {
const auto& from = cinfo.retrieve_auxiliary<gms::inet_address>("baddr");
return smp::submit_to(dst_cpu_id, [plan_id, from] () mutable {
auto session = get_session(plan_id, from, "PREPARE_DONE_MESSAGE");
session->follower_start_sent();
return make_ready_future<>();
});
});
ms().register_stream_mutation([] (const rpc::client_info& cinfo, UUID plan_id, frozen_mutation fm, unsigned dst_cpu_id) {
auto from = net::messaging_service::get_source(cinfo);
return do_with(std::move(fm), [plan_id, from] (const auto& fm) {
auto fm_size = fm.representation().size();
get_local_stream_manager().update_progress(plan_id, from.addr, progress_info::direction::IN, fm_size);
return service::get_schema_for_write(fm.schema_version(), from).then([&fm] (schema_ptr s) {
return service::get_storage_proxy().local().mutate_locally(std::move(s), fm);
});
});
});
ms().register_stream_mutation_done([] (const rpc::client_info& cinfo, UUID plan_id, std::vector<range<dht::token>> ranges, UUID cf_id, unsigned dst_cpu_id) {
const auto& from = cinfo.retrieve_auxiliary<gms::inet_address>("baddr");
return smp::submit_to(dst_cpu_id, [ranges = std::move(ranges), plan_id, cf_id, from] () mutable {
auto session = get_session(plan_id, from, "STREAM_MUTATION_DONE", cf_id);
session->receive_task_completed(cf_id);
return session->get_db().invoke_on_all([ranges = std::move(ranges), cf_id] (database& db) {
auto& cf = db.find_column_family(cf_id);
for (auto& range : ranges) {
cf.get_row_cache().invalidate(query::to_partition_range(range));
}
});
});
});
ms().register_complete_message([] (const rpc::client_info& cinfo, UUID plan_id, unsigned dst_cpu_id) {
const auto& from = cinfo.retrieve_auxiliary<gms::inet_address>("baddr");
return smp::submit_to(dst_cpu_id, [plan_id, from, dst_cpu_id] () mutable {
auto session = get_session(plan_id, from, "COMPLETE_MESSAGE");
session->complete();
});
});
}
distributed<database>* stream_session::_db;
stream_session::stream_session() = default;
stream_session::stream_session(inet_address peer_)
: peer(peer_) {
//this.metrics = StreamingMetrics.get(connecting);
}
stream_session::~stream_session() = default;
future<> stream_session::init_streaming_service(distributed<database>& db) {
_db = &db;
// #293 - do not stop anything
// engine().at_exit([] {
// return get_stream_manager().stop();
// });
return get_stream_manager().start().then([] {
return _db->invoke_on_all([] (auto& db) {
init_messaging_service_handler();
});
});
}
future<> stream_session::test(distributed<cql3::query_processor>& qp) {
if (utils::fb_utilities::get_broadcast_address() == inet_address("127.0.0.1")) {
auto tester = make_shared<timer<lowres_clock>>();
tester->set_callback ([tester, &qp] {
seastar::async([&qp] {
sslog.debug("================ STREAM_PLAN TEST ==============");
auto cs = service::client_state::for_external_calls();
service::query_state qs(cs);
auto& opts = cql3::query_options::DEFAULT;
qp.local().process("CREATE KEYSPACE ks WITH REPLICATION = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };", qs, opts).get();
sslog.debug("CREATE KEYSPACE = KS DONE");
sleep(std::chrono::seconds(3)).get();
qp.local().process("CREATE TABLE ks.tb ( key text PRIMARY KEY, C0 text, C1 text, C2 text, C3 blob, C4 text);", qs, opts).get();
sslog.debug("CREATE TABLE = TB DONE");
sleep(std::chrono::seconds(3)).get();
qp.local().process("insert into ks.tb (key,c0) values ('1','1');", qs, opts).get();
sslog.debug("INSERT VALUE DONE: 1");
qp.local().process("insert into ks.tb (key,c0) values ('2','2');", qs, opts).get();
sslog.debug("INSERT VALUE DONE: 2");
qp.local().process("insert into ks.tb (key,c0) values ('3','3');", qs, opts).get();
sslog.debug("INSERT VALUE DONE: 3");
qp.local().process("insert into ks.tb (key,c0) values ('4','4');", qs, opts).get();
sslog.debug("INSERT VALUE DONE: 4");
qp.local().process("insert into ks.tb (key,c0) values ('5','5');", qs, opts).get();
sslog.debug("INSERT VALUE DONE: 5");
qp.local().process("insert into ks.tb (key,c0) values ('6','6');", qs, opts).get();
sslog.debug("INSERT VALUE DONE: 6");
}).then([] {
sleep(std::chrono::seconds(10)).then([] {
sslog.debug("================ START STREAM ==============");
auto sp = stream_plan("MYPLAN");
auto to = inet_address("127.0.0.2");
auto tb = sstring("tb");
auto ks = sstring("ks");
std::vector<query::range<token>> ranges = {query::range<token>::make_open_ended_both_sides()};
std::vector<sstring> cfs{tb};
sp.transfer_ranges(to, ks, ranges, cfs).request_ranges(to, ks, ranges, cfs).execute().then_wrapped([] (auto&& f) {
try {
auto state = f.get0();
sslog.debug("plan_id={} description={} DONE", state.plan_id, state.description);
sslog.debug("================ FINISH STREAM ==============");
} catch (const stream_exception& e) {
auto& state = e.state;
sslog.debug("plan_id={} description={} FAIL: {}", state.plan_id, state.description, e.what());
sslog.error("================ FAIL STREAM ==============");
}
});
});
});
});
tester->arm(std::chrono::seconds(10));
}
return make_ready_future<>();
}
future<> stream_session::on_initialization_complete() {
// send prepare message
set_state(stream_session_state::PREPARING);
auto prepare = prepare_message();
std::copy(_requests.begin(), _requests.end(), std::back_inserter(prepare.requests));
for (auto& x : _transfers) {
prepare.summaries.emplace_back(x.second.get_summary());
}
auto id = msg_addr{this->peer, 0};
sslog.debug("[Stream #{}] SEND PREPARE_MESSAGE to {}", plan_id(), id);
return ms().send_prepare_message(id, std::move(prepare), plan_id(), description()).then_wrapped([this, id] (auto&& f) {
try {
auto msg = f.get0();
sslog.debug("[Stream #{}] GOT PREPARE_MESSAGE Reply from {}", this->plan_id(), this->peer);
this->dst_cpu_id = msg.dst_cpu_id;
for (auto& summary : msg.summaries) {
this->prepare_receiving(summary);
}
_stream_result->handle_session_prepared(this->shared_from_this());
this->start_streaming_files();
} catch (...) {
sslog.error("[Stream #{}] Fail to send PREPARE_MESSAGE to {}, {}", this->plan_id(), id, std::current_exception());
throw;
}
return make_ready_future<>();
}).then([this, id] {
auto plan_id = this->plan_id();
sslog.debug("[Stream #{}] SEND PREPARE_DONE_MESSAGE to {}", plan_id, id);
return ms().send_prepare_done_message(id, plan_id, this->dst_cpu_id).then([this] {
sslog.debug("[Stream #{}] GOT PREPARE_DONE_MESSAGE Reply from {}", this->plan_id(), this->peer);
}).handle_exception([id, plan_id] (auto ep) {
sslog.error("[Stream #{}] Fail to send PREPARE_DONE_MESSAGE to {}, {}", plan_id, id, ep);
std::rethrow_exception(ep);
});
});
}
void stream_session::on_error() {
sslog.error("[Stream #{}] Streaming error occurred", plan_id());
// fail session
close_session(stream_session_state::FAILED);
}
// Only follower calls this function upon receiving of prepare_message from initiator
future<prepare_message> stream_session::prepare(std::vector<stream_request> requests, std::vector<stream_summary> summaries) {
auto plan_id = this->plan_id();
sslog.debug("[Stream #{}] prepare requests nr={}, summaries nr={}", plan_id, requests.size(), summaries.size());
// prepare tasks
set_state(stream_session_state::PREPARING);
auto& db = get_local_db();
for (auto& request : requests) {
// always flush on stream request
sslog.debug("[Stream #{}] prepare stream_request={}", plan_id, request);
auto ks = request.keyspace;
// Make sure cf requested by peer node exists
for (auto& cf : request.column_families) {
try {
db.find_column_family(ks, cf);
} catch (no_such_column_family) {
auto err = sprint("[Stream #{}] prepare requested ks={} cf={} does not exist", ks, cf);
sslog.error(err.c_str());
throw std::runtime_error(err);
}
}
add_transfer_ranges(request.keyspace, request.ranges, request.column_families);
}
for (auto& summary : summaries) {
sslog.debug("[Stream #{}] prepare stream_summary={}", plan_id, summary);
auto cf_id = summary.cf_id;
// Make sure cf the peer node will sent to us exists
try {
db.find_column_family(cf_id);
} catch (no_such_column_family) {
auto err = sprint("[Stream #{}] prepare cf_id=%s does not exist", plan_id, cf_id);
sslog.error(err.c_str());
throw std::runtime_error(err);
}
prepare_receiving(summary);
}
// Always send a prepare_message back to follower
prepare_message prepare;
if (!requests.empty()) {
for (auto& x: _transfers) {
auto& task = x.second;
prepare.summaries.emplace_back(task.get_summary());
}
}
prepare.dst_cpu_id = engine().cpu_id();;
_stream_result->handle_session_prepared(shared_from_this());
return make_ready_future<prepare_message>(std::move(prepare));
}
void stream_session::follower_start_sent() {
sslog.debug("[Stream #{}] Follower start to sent", this->plan_id());
this->start_streaming_files();
}
void stream_session::complete() {
if (_state == stream_session_state::WAIT_COMPLETE) {
send_complete_message();
sslog.debug("[Stream #{}] complete: WAIT_COMPLETE -> COMPLETE: session={}", plan_id(), this);
close_session(stream_session_state::COMPLETE);
} else {
sslog.debug("[Stream #{}] complete: {} -> WAIT_COMPLETE: session={}", plan_id(), _state, this);
set_state(stream_session_state::WAIT_COMPLETE);
}
}
void stream_session::session_failed() {
close_session(stream_session_state::FAILED);
}
session_info stream_session::make_session_info() {
std::vector<stream_summary> receiving_summaries;
for (auto& receiver : _receivers) {
receiving_summaries.emplace_back(receiver.second.get_summary());
}
std::vector<stream_summary> transfer_summaries;
for (auto& transfer : _transfers) {
transfer_summaries.emplace_back(transfer.second.get_summary());
}
return session_info(peer, std::move(receiving_summaries), std::move(transfer_summaries), _state);
}
void stream_session::receive_task_completed(UUID cf_id) {
_receivers.erase(cf_id);
sslog.debug("[Stream #{}] receive task_completed: cf_id={} done, stream_receive_task.size={} stream_transfer_task.size={}",
plan_id(), cf_id, _receivers.size(), _transfers.size());
maybe_completed();
}
void stream_session::transfer_task_completed(UUID cf_id) {
_transfers.erase(cf_id);
sslog.debug("[Stream #{}] transfer task_completed: cf_id={} done, stream_receive_task.size={} stream_transfer_task.size={}",
plan_id(), cf_id, _receivers.size(), _transfers.size());
maybe_completed();
}
void stream_session::send_complete_message() {
if (!_complete_sent) {
_complete_sent = true;
} else {
return;
}
auto id = msg_addr{this->peer, this->dst_cpu_id};
auto plan_id = this->plan_id();
sslog.debug("[Stream #{}] SEND COMPLETE_MESSAGE to {}", plan_id, id);
auto session = shared_from_this();
this->ms().send_complete_message(id, plan_id, this->dst_cpu_id).then([session, id, plan_id] {
sslog.debug("[Stream #{}] GOT COMPLETE_MESSAGE Reply from {}", plan_id, id.addr);
}).handle_exception([session, id, plan_id] (auto ep) {
sslog.warn("[Stream #{}] ERROR COMPLETE_MESSAGE Reply from {}: {}", plan_id, id.addr, ep);
session->on_error();
});
}
bool stream_session::maybe_completed() {
bool completed = _receivers.empty() && _transfers.empty();
if (completed) {
if (_state == stream_session_state::WAIT_COMPLETE) {
send_complete_message();
sslog.debug("[Stream #{}] maybe_completed: WAIT_COMPLETE -> COMPLETE: session={}, peer={}", plan_id(), this, peer);
close_session(stream_session_state::COMPLETE);
} else {
// notify peer that this session is completed
sslog.debug("[Stream #{}] maybe_completed: {} -> WAIT_COMPLETE: session={}, peer={}", plan_id(), _state, this, peer);
set_state(stream_session_state::WAIT_COMPLETE);
send_complete_message();
}
}
return completed;
}
void stream_session::prepare_receiving(stream_summary& summary) {
if (summary.files > 0) {
// FIXME: handle when cf_id already exists
_receivers.emplace(summary.cf_id, stream_receive_task(shared_from_this(), summary.cf_id, summary.files, summary.total_size));
}
}
void stream_session::start_streaming_files() {
sslog.debug("[Stream #{}] {}: {} transfers to send", plan_id(), __func__, _transfers.size());
if (!_transfers.empty()) {
set_state(stream_session_state::STREAMING);
}
for (auto it = _transfers.begin(); it != _transfers.end();) {
stream_transfer_task& task = it->second;
it++;
task.start();
}
}
std::vector<column_family*> stream_session::get_column_family_stores(const sstring& keyspace, const std::vector<sstring>& column_families) {
// if columnfamilies are not specified, we add all cf under the keyspace
std::vector<column_family*> stores;
auto& db = get_local_db();
if (column_families.empty()) {
for (auto& x : db.get_column_families()) {
column_family& cf = *(x.second);
auto cf_name = cf.schema()->cf_name();
auto ks_name = cf.schema()->ks_name();
if (ks_name == keyspace) {
sslog.info("Find ks={} cf={}", ks_name, cf_name);
stores.push_back(&cf);
}
}
} else {
// TODO: We can move this to database class and use shared_ptr<column_family> instead
for (auto& cf_name : column_families) {
try {
auto& x = db.find_column_family(keyspace, cf_name);
stores.push_back(&x);
} catch (no_such_column_family) {
sslog.warn("stream_session: {}.{} does not exist: {}\n", keyspace, cf_name, std::current_exception());
continue;
}
}
}
return stores;
}
void stream_session::add_transfer_ranges(sstring keyspace, std::vector<query::range<token>> ranges, std::vector<sstring> column_families) {
auto cfs = get_column_family_stores(keyspace, column_families);
for (auto& cf : cfs) {
auto cf_id = cf->schema()->id();
stream_transfer_task task(shared_from_this(), cf_id, ranges);
auto inserted = _transfers.emplace(cf_id, std::move(task)).second;
assert(inserted);
}
}
void stream_session::close_session(stream_session_state final_state) {
sslog.debug("[Stream #{}] close_session session={}, state={}, is_aborted={}", plan_id(), this, final_state, _is_aborted);
if (!_is_aborted) {
_is_aborted = true;
set_state(final_state);
if (final_state == stream_session_state::FAILED) {
for (auto& x : _transfers) {
stream_transfer_task& task = x.second;
sslog.debug("[Stream #{}] close_session session={}, state={}, abort stream_transfer_task cf_id={}", plan_id(), this, final_state, task.cf_id);
task.abort();
}
for (auto& x : _receivers) {
stream_receive_task& task = x.second;
sslog.debug("[Stream #{}] close_session session={}, state={}, abort stream_receive_task cf_id={}", plan_id(), this, final_state, task.cf_id);
task.abort();
}
}
// Note that we shouldn't block on this close because this method is called on the handler
// incoming thread (so we would deadlock).
//handler.close();
_stream_result->handle_session_complete(shared_from_this());
sslog.debug("[Stream #{}] close_session session={}, state={}, cancel keep_alive timer", plan_id(), this, final_state);
_keep_alive.cancel();
}
}
void stream_session::start() {
if (_requests.empty() && _transfers.empty()) {
sslog.info("[Stream #{}] Session does not have any tasks.", plan_id());
close_session(stream_session_state::COMPLETE);
return;
}
auto connecting = net::get_local_messaging_service().get_preferred_ip(peer);
if (peer == connecting) {
sslog.info("[Stream #{}] Starting streaming to {}", plan_id(), peer);
} else {
sslog.info("[Stream #{}] Starting streaming to {} through {}", plan_id(), peer, connecting);
}
on_initialization_complete().handle_exception([this] (auto ep) {
this->on_error();
});
}
void stream_session::init(shared_ptr<stream_result_future> stream_result_) {
_stream_result = stream_result_;
_keep_alive.set_callback([this] {
auto plan_id = this->plan_id();
get_local_stream_manager().get_progress_on_all_shards(plan_id, this->peer).then([this] (stream_bytes sbytes) {
auto now = lowres_clock::now();
sslog.debug("[Stream #{}] keep alive timer callback sbytes old: tx={}, rx={} new: tx={} rx={}",
this->plan_id(),
this->_last_stream_bytes.bytes_sent, this->_last_stream_bytes.bytes_received,
sbytes.bytes_sent, sbytes.bytes_received);
if (sbytes.bytes_sent > this->_last_stream_bytes.bytes_sent ||
sbytes.bytes_received > this->_last_stream_bytes.bytes_received) {
// Progress has been made
this->_last_stream_bytes = sbytes;
this->_last_stream_progress = now;
this->start_keep_alive_timer();
} else if (now - this->_last_stream_progress >= this->_keep_alive_timeout) {
// Timeout
sslog.info("[Stream #{}] The session {} is idle for {} seconds, the peer {} is probably gone, close it",
this->plan_id(), this, this->_keep_alive_timeout.count(), this->peer);
this->on_error();
} else {
// Start the timer to check again
this->start_keep_alive_timer();
}
}).handle_exception([plan_id] (auto ep) {
sslog.info("[Stream #{}] keep alive timer callback fails: {}", plan_id, ep);
});
});
_last_stream_progress = lowres_clock::now();
start_keep_alive_timer();
}
utils::UUID stream_session::plan_id() {
return _stream_result ? _stream_result->plan_id : UUID();
}
sstring stream_session::description() {
return _stream_result ? _stream_result->description : "";
}
future<> stream_session::update_progress() {
return get_local_stream_manager().get_progress_on_all_shards(plan_id(), peer).then([this] (auto sbytes) {
auto bytes_sent = sbytes.bytes_sent;
if (bytes_sent > 0) {
auto tx = progress_info(this->peer, "txnofile", progress_info::direction::OUT, bytes_sent, bytes_sent);
_session_info.update_progress(std::move(tx));
}
auto bytes_received = sbytes.bytes_received;
if (bytes_received > 0) {
auto rx = progress_info(this->peer, "rxnofile", progress_info::direction::IN, bytes_received, bytes_received);
_session_info.update_progress(std::move(rx));
}
});
}
} // namespace streaming
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