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scylladb/streaming/stream_blob.cc
Pavel Emelyanov bfbe802632 streaming: Relax load_sstable_for_tablet() 
The method does several excessive things, that can be relaxed

1. In order to transfer a table-id to another shard, finds the table on
   source shard, gets schema and captures schema id on invoke_on()'s
   lambda. It can just capture the original table-id

2. In order to get sstable parameters (format, version, etc.) generates
   toc_filename(), then calls parse_path() to convert it into the
   entry_descriptor. The descriptor can be read from sstable directly.

3. Logging "success" includes target shard into the message, but happens
   on the source shard. The message can be just logged on target shard.

Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>

Closes scylladb/scylladb#23197
2025-03-14 15:26:48 +02:00

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/*
* Copyright (C) 2023-present ScyllaDB
*/
/*
* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
*/
#include "message/messaging_service.hh"
#include "streaming/stream_blob.hh"
#include "streaming/stream_plan.hh"
#include "gms/inet_address.hh"
#include "utils/pretty_printers.hh"
#include "utils/error_injection.hh"
#include "locator/host_id.hh"
#include "replica/database.hh"
#include "sstables/sstables.hh"
#include "sstables/sstables_manager.hh"
#include "sstables/sstable_version.hh"
#include "sstables/generation_type.hh"
#include "sstables/types.hh"
#include "idl/streaming.dist.hh"
#include "service/topology_guard.hh"
#include <seastar/core/coroutine.hh>
#include <seastar/core/sstring.hh>
#include <seastar/core/future.hh>
#include <seastar/core/fstream.hh>
#include <seastar/coroutine/parallel_for_each.hh>
#include <seastar/coroutine/all.hh>
#include <vector>
#include <cfloat>
#include <filesystem>
#include <fmt/ranges.h>
namespace streaming {
static logging::logger blogger("stream_blob");
constexpr size_t file_stream_buffer_size = 128 * 1024;
constexpr size_t file_stream_write_behind = 10;
constexpr size_t file_stream_read_ahead = 4;
static sstables::sstable_state sstable_state(const streaming::stream_blob_meta& meta) {
return meta.sstable_state.value_or(sstables::sstable_state::normal);
}
static future<> load_sstable_for_tablet(const file_stream_id& ops_id, replica::database& db, table_id id, sstables::sstable_state state, sstables::entry_descriptor desc, seastar::shard_id shard) {
co_await db.container().invoke_on(shard, [id, desc, state, ops_id] (replica::database& db) -> future<> {
replica::table& t = db.find_column_family(id);
auto erm = t.get_effective_replication_map();
auto& sstm = t.get_sstables_manager();
auto sst = sstm.make_sstable(t.schema(), t.get_storage_options(), desc.generation, state, desc.version, desc.format);
co_await sst->load(erm->get_sharder(*t.schema()));
co_await t.add_sstable_and_update_cache(sst);
blogger.info("stream_sstables[{}] Loaded sstable {} successfully", ops_id, sst->toc_filename());
});
}
static utils::pretty_printed_throughput get_bw(size_t total_size, std::chrono::steady_clock::time_point start_time) {
auto duration = std::chrono::steady_clock::now() - start_time;
return utils::pretty_printed_throughput(total_size, duration);
}
// For tablet stream checks
class tablet_stream_status {
public:
bool finished = false;
void check_valid_stream();
};
void tablet_stream_status::check_valid_stream() {
if (finished) {
throw std::runtime_error("The stream has finished already");
}
}
static thread_local std::unordered_map<file_stream_id, lw_shared_ptr<tablet_stream_status>> tablet_streams;
future<> mark_tablet_stream_start(file_stream_id ops_id) {
return seastar::smp::invoke_on_all([ops_id] {
auto status = make_lw_shared<tablet_stream_status>();
tablet_streams.emplace(ops_id, status);
});
}
future<> mark_tablet_stream_done(file_stream_id ops_id) {
return seastar::smp::invoke_on_all([ops_id] {
auto it = tablet_streams.find(ops_id);
if (it == tablet_streams.end()) {
return;
}
auto status = it->second;
if (status) {
status->finished = true;
}
tablet_streams.erase(ops_id);
});
}
lw_shared_ptr<tablet_stream_status> get_tablet_stream(file_stream_id ops_id) {
auto status = tablet_streams[ops_id];
if (!status) {
auto msg = format("stream_sstables[{}] Could not find ops_id={}", ops_id, ops_id);
blogger.warn("{}", msg);
throw std::runtime_error(msg);
}
return status;
}
static void may_inject_error(const streaming::stream_blob_meta& meta, bool may_inject, const sstring& error) {
if (may_inject) {
if (rand() % 500 == 0) {
auto msg = format("fstream[{}] Injected file stream error={} file={}",
meta.ops_id, error, meta.filename);
blogger.warn("{}", msg);
throw std::runtime_error(msg);
}
}
}
future<> stream_blob_handler(replica::database& db,
netw::messaging_service& ms,
gms::inet_address from,
streaming::stream_blob_meta meta,
rpc::sink<streaming::stream_blob_cmd_data> sink,
rpc::source<streaming::stream_blob_cmd_data> source,
stream_blob_create_output_fn create_output,
bool inject_errors) {
bool fstream_closed = false;
bool sink_closed = false;
bool status_sent = false;
size_t total_size = 0;
auto start_time = std::chrono::steady_clock::now();
std::optional<output_stream<char>> fstream;
std::exception_ptr error;
stream_blob_finish_fn finish;
// Will log a message when streaming is done. Used to synchronize tests.
lw_shared_ptr<std::any> log_done;
if (utils::get_local_injector().is_enabled("stream_mutation_fragments")) {
log_done = make_lw_shared<std::any>(seastar::make_shared(seastar::defer([] {
blogger.info("stream_mutation_fragments: done (tablets)");
})));
}
try {
auto status = get_tablet_stream(meta.ops_id);
auto guard = service::topology_guard(meta.topo_guard);
// Reject any file_ops that is not support by this node
if (meta.fops != streaming::file_ops::stream_sstables &&
meta.fops != streaming::file_ops::load_sstables) {
auto msg = format("fstream[{}] Unsupported file_ops={} peer={} file={}",
meta.ops_id, int(meta.fops), from, meta.filename);
blogger.warn("{}", msg);
throw std::runtime_error(msg);
}
blogger.debug("fstream[{}] Follower started peer={} file={}",
meta.ops_id, from, meta.filename);
auto [f, out] = co_await create_output(db, meta);
finish = std::move(f);
fstream = std::move(out);
bool got_end_of_stream = false;
for (;;) {
try {
auto opt = co_await source();
if (!opt) {
break;
}
co_await utils::get_local_injector().inject("stream_mutation_fragments", [&guard] (auto& handler) -> future<> {
blogger.info("stream_mutation_fragments: waiting (tablets)");
while (!handler.poll_for_message()) {
guard.check();
co_await sleep(std::chrono::milliseconds(5));
}
blogger.info("stream_mutation_fragments: released (tablets)");
});
stream_blob_cmd_data& cmd_data = std::get<0>(*opt);
auto cmd = cmd_data.cmd;
if (cmd == streaming::stream_blob_cmd::error) {
blogger.warn("fstream[{}] Follower got stream_blob_cmd::error from peer={} file={}",
meta.ops_id, from, meta.filename);
throw std::runtime_error(format("Got stream_blob_cmd::error from peer={} file={}", from, meta.filename));
} else if (cmd == streaming::stream_blob_cmd::end_of_stream) {
blogger.debug("fstream[{}] Follower got stream_blob_cmd::end_of_stream from peer={} file={}",
meta.ops_id, from, meta.filename);
got_end_of_stream = true;
} else if (cmd == streaming::stream_blob_cmd::data) {
std::optional<streaming::stream_blob_data> data = std::move(cmd_data.data);
if (data) {
total_size += data->size();
blogger.trace("fstream[{}] Follower received data from peer={} data={}", meta.ops_id, from, data->size());
status->check_valid_stream();
if (!data->empty()) {
co_await fstream->write((char*)data->data(), data->size());
}
}
}
} catch (seastar::rpc::stream_closed&) {
// After we get streaming::stream_blob_cmd::end_of_stream which
// is the last message from peer, it does not matter if the
// source() is closed or not.
if (got_end_of_stream) {
break;
} else {
throw;
}
} catch (...) {
throw;
}
may_inject_error(meta, inject_errors, "rx_data");
}
// If we reach here, streaming::stream_blob_cmd::end_of_stream should be received. Otherwise there
// must be an error, e.g., the sender closed the stream without sending streaming::stream_blob_cmd::error.
if (!got_end_of_stream) {
throw std::runtime_error(format("fstream[{}] Follower failed to get end_of_stream", meta.ops_id));
}
status->check_valid_stream();
co_await fstream->flush();
co_await fstream->close();
fstream_closed = true;
may_inject_error(meta, inject_errors, "flush_and_close");
co_await finish(store_result::ok);
// Send status code and close the sink
co_await sink(streaming::stream_blob_cmd_data(streaming::stream_blob_cmd::ok));
status_sent = true;
co_await sink.close();
sink_closed = true;
} catch (...) {
error = std::current_exception();
}
if (error) {
blogger.warn("fstream[{}] Follower failed peer={} file={} received_size={} bw={} error={}",
meta.ops_id, from, meta.filename, total_size, get_bw(total_size, start_time), error);
if (!fstream_closed) {
try {
if (fstream) {
// Make sure fstream is always closed
co_await fstream->close();
}
} catch (...) {
blogger.warn("fstream[{}] Follower failed to close the file stream: {}",
meta.ops_id, std::current_exception());
// We could do nothing but continue to cleanup more
}
}
if (!status_sent) {
try {
may_inject_error(meta, inject_errors, "no_error_code_back");
co_await sink(streaming::stream_blob_cmd_data(streaming::stream_blob_cmd::error));
} catch (...) {
// Try our best to send the status code.
// If we could not send it, we could do nothing but close the sink.
blogger.warn("fstream[{}] Follower failed to send error code: {}",
meta.ops_id, std::current_exception());
}
}
try {
if (!sink_closed) {
// Make sure sink is always closed
co_await sink.close();
}
} catch (...) {
blogger.warn("fstream[{}] Follower failed to close the stream sink: {}",
meta.ops_id, std::current_exception());
}
try {
// Drain everything in source
for (;;) {
auto opt = co_await source();
if (!opt) {
break;
}
}
} catch (...) {
blogger.warn("fstream[{}] Follower failed to drain rpc stream source: {}",
meta.ops_id, std::current_exception());
}
try {
// Remove the file in case of error
if (finish) {
co_await finish(store_result::failure);
blogger.info("fstream[{}] Follower removed partial file={}", meta.ops_id, meta.filename);
}
} catch (...) {
blogger.warn("fstream[{}] Follower failed to remove partial file={}: {}",
meta.ops_id, meta.filename, std::current_exception());
}
// Do not call rethrow_exception(error) because the caller could do nothing but log
// the error. We have already logged the error here.
} else {
// Get some statistics
blogger.debug("fstream[{}] Follower finished peer={} file={} received_size={} bw={}",
meta.ops_id, from, meta.filename, total_size, get_bw(total_size, start_time));
}
co_return;
}
future<> stream_blob_handler(replica::database& db, netw::messaging_service& ms,
gms::inet_address from,
streaming::stream_blob_meta meta,
rpc::sink<streaming::stream_blob_cmd_data> sink,
rpc::source<streaming::stream_blob_cmd_data> source) {
co_await stream_blob_handler(db, ms, std::move(from), meta, std::move(sink), std::move(source), [](replica::database& db, const streaming::stream_blob_meta& meta) -> future<output_result> {
auto foptions = file_open_options();
foptions.sloppy_size = true;
foptions.extent_allocation_size_hint = 32 << 20;
auto stream_options = file_output_stream_options();
stream_options.buffer_size = file_stream_buffer_size;
stream_options.write_behind = file_stream_write_behind;
auto& table = db.find_column_family(meta.table);
auto& sstm = table.get_sstables_manager();
auto sstable_sink = sstables::create_stream_sink(table.schema(), sstm, table.get_storage_options(), sstable_state(meta), meta.filename, meta.fops == file_ops::load_sstables);
auto out = co_await sstable_sink->output(foptions, stream_options);
co_return output_result{
[sstable_sink = std::move(sstable_sink), &meta, &db](store_result res) -> future<> {
if (res != store_result::ok) {
co_await sstable_sink->abort();
co_return;
}
auto sst = co_await sstable_sink->close_and_seal();
if (sst) {
blogger.debug("stream_sstables[{}] Loading sstable {} on shard {}", meta.ops_id, sst->toc_filename(), meta.dst_shard_id);
auto desc = sst->get_descriptor(sstables::component_type::TOC);
sst = {};
co_await load_sstable_for_tablet(meta.ops_id, db, meta.table, sstable_state(meta), std::move(desc), meta.dst_shard_id);
}
},
std::move(out)
};
});
}
// Get a new sstable name using the new generation
// For example:
// oldname: me-3ga1_0iiv_2e5uo2flv7lgdl2j0d-big-Index.db
// newgen: 3ga1_0iiv_3vj5c2flv7lgdl2j0d
// newname: me-3ga1_0iiv_3vj5c2flv7lgdl2j0d-big-Index.db
static std::string get_sstable_name_with_generation(const file_stream_id& ops_id, const std::string& oldname, const std::string& newgen) {
std::string newname = oldname;
// The generation name starts after the first '-'.
auto it = newname.find("-");
if (it != std::string::npos) {
newname.replace(++it, newgen.size(), newgen);
return newname;
} else {
auto msg = fmt::format("fstream[{}] Failed to get sstable name for {} with generation {}", ops_id, oldname, newgen);
blogger.warn("{}", msg);
throw std::runtime_error(msg);
}
}
}
template<> struct fmt::formatter<streaming::stream_blob_info> : fmt::ostream_formatter {};
namespace streaming {
// Send files in the files list to the nodes in targets list over network
// Returns number of bytes sent over network
future<size_t>
tablet_stream_files(netw::messaging_service& ms, std::list<stream_blob_info> sources, std::vector<node_and_shard> targets, table_id table, file_stream_id ops_id, host2ip_t host2ip, service::frozen_topology_guard topo_guard, bool inject_errors) {
size_t ops_total_size = 0;
if (targets.empty()) {
co_return ops_total_size;
}
if (sources.empty()) {
co_return ops_total_size;
}
blogger.debug("fstream[{}] Master started sending n={}, sources={}, targets={}",
ops_id, sources.size(), sources, targets);
struct sink_and_source {
gms::inet_address node;
rpc::sink<streaming::stream_blob_cmd_data> sink;
rpc::source<streaming::stream_blob_cmd_data> source;
bool sink_closed = false;
bool status_sent = false;
};
auto ops_start_time = std::chrono::steady_clock::now();
streaming::stream_blob_meta meta;
meta.ops_id = ops_id;
meta.table = table;
meta.topo_guard = topo_guard;
std::exception_ptr error;
auto stream_options = file_input_stream_options();
stream_options.buffer_size = file_stream_buffer_size;
stream_options.read_ahead = file_stream_read_ahead;
for (auto& info : sources) {
auto& filename = info.filename;
std::optional<input_stream<char>> fstream;
bool fstream_closed = false;
try {
meta.fops = info.fops;
meta.filename = info.filename;
meta.sstable_state = info.sstable_state;
fstream = co_await info.source(stream_options);
} catch (...) {
blogger.warn("fstream[{}] Master failed sources={} targets={} error={}",
ops_id, sources, targets, std::current_exception());
throw;
}
std::vector<sink_and_source> ss;
size_t total_size = 0;
auto start_time = std::chrono::steady_clock::now();
bool got_error_from_peer = false;
try {
for (auto& x : targets) {
const auto& node = x.node;
meta.dst_shard_id = x.shard;
auto ip = co_await host2ip(node);
blogger.debug("fstream[{}] Master creating sink and source for node={}/{}, file={}, targets={}", ops_id, node, ip, filename, targets);
auto [sink, source] = co_await ms.make_sink_and_source_for_stream_blob(meta, node);
ss.push_back(sink_and_source{ip, std::move(sink), std::move(source)});
}
// This fiber sends data to peer node
auto send_data_to_peer = [&] () mutable -> future<> {
std::exception_ptr error;
try {
while (!got_error_from_peer) {
may_inject_error(meta, inject_errors, "read_data");
auto buf = co_await fstream->read_up_to(file_stream_buffer_size);
if (buf.size() == 0) {
break;
}
streaming::stream_blob_data data(std::move(buf));
auto data_size = data.size();
stream_blob_cmd_data cmd_data(streaming::stream_blob_cmd::data, std::move(data));
co_await coroutine::parallel_for_each(ss, [&] (sink_and_source& s) mutable -> future<> {
total_size += data_size;
ops_total_size += data_size;
blogger.trace("fstream[{}] Master sending file={} to node={} chunk_size={}",
ops_id, filename, s.node, data_size);
may_inject_error(meta, inject_errors, "tx_data");
co_await s.sink(cmd_data);
});
}
} catch (...) {
error = std::current_exception();
}
if (error) {
// We have to close the stream otherwise if the stream is
// ok, the get_status_code_from_peer fiber below might
// wait for the source() forever.
for (auto& s : ss) {
try {
co_await s.sink.close();
s.sink_closed = true;
} catch (...) {
}
}
std::rethrow_exception(error);
}
if (fstream) {
co_await fstream->close();
fstream_closed = true;
}
for (auto& s : ss) {
blogger.debug("fstream[{}] Master done sending file={} to node={}", ops_id, filename, s.node);
if (!got_error_from_peer) {
co_await s.sink(streaming::stream_blob_cmd_data(streaming::stream_blob_cmd::end_of_stream));
s.status_sent = true;
}
co_await s.sink.close();
s.sink_closed = true;
}
};
// This fiber gets status code from peer node
auto get_status_code_from_peer = [&] () mutable -> future<> {
co_await coroutine::parallel_for_each(ss, [&] (sink_and_source& s) mutable -> future<> {
bool got_cmd_ok = false;
while (!got_error_from_peer) {
try {
auto opt = co_await s.source();
if (opt) {
stream_blob_cmd_data& cmd_data = std::get<0>(*opt);
if (cmd_data.cmd == streaming::stream_blob_cmd::error) {
got_error_from_peer = true;
blogger.warn("fstream[{}] Master got stream_blob_cmd::error file={} peer={}",
ops_id, filename, s.node);
throw std::runtime_error(format("Got stream_blob_cmd::error from peer {}", s.node));
} if (cmd_data.cmd == streaming::stream_blob_cmd::ok) {
got_cmd_ok = true;
}
blogger.debug("fstream[{}] Master got stream_blob_cmd={} file={} peer={}",
ops_id, int(cmd_data.cmd), filename, s.node);
} else {
break;
}
} catch (seastar::rpc::stream_closed&) {
// After we get streaming::stream_blob_cmd::ok
// which is the last message from peer, it does not
// matter if the source() is closed or not.
if (got_cmd_ok) {
break;
} else {
throw;
}
} catch (...) {
throw;
}
}
});
};
co_await coroutine::all(send_data_to_peer, get_status_code_from_peer);
} catch (...) {
error = std::current_exception();
}
if (error) {
blogger.warn("fstream[{}] Master failed sending file={} to targets={} send_size={} bw={} error={}",
ops_id, filename, targets, total_size, get_bw(total_size, start_time), error);
// Error handling for fstream and sink
if (!fstream_closed) {
try {
if (fstream) {
co_await fstream->close();
}
} catch (...) {
// We could do nothing but continue to cleanup more
blogger.warn("fstream[{}] Master failed to close file stream: {}",
ops_id, std::current_exception());
}
}
for (auto& s : ss) {
try {
if (!s.status_sent && !s.sink_closed) {
co_await s.sink(streaming::stream_blob_cmd_data(streaming::stream_blob_cmd::error));
s.status_sent = true;
}
} catch (...) {
// We could do nothing but continue to close
blogger.warn("fstream[{}] Master failed to send error code: {}",
ops_id, std::current_exception());
}
try {
if (!s.sink_closed) {
co_await s.sink.close();
s.sink_closed = true;
}
} catch (...) {
// We could do nothing but continue
blogger.warn("fstream[{}] Master failed to close rpc stream sink: {}",
ops_id, std::current_exception());
}
try {
// Drain everything in source
for (;;) {
auto opt = co_await s.source();
if (!opt) {
break;
}
}
} catch (...) {
blogger.warn("fstream[{}] Master failed to drain rpc stream source: {}",
ops_id, std::current_exception());
}
}
// Stop handling remaining files
break;
} else {
blogger.debug("fstream[{}] Master done sending file={} to targets={} send_size={} bw={}",
ops_id, filename, targets, total_size, get_bw(total_size, start_time));
}
}
if (error) {
blogger.warn("fstream[{}] Master failed sending files_nr={} files={} targets={} send_size={} bw={} error={}",
ops_id, sources.size(), sources, targets, ops_total_size, get_bw(ops_total_size, ops_start_time), error);
std::rethrow_exception(error);
} else {
blogger.debug("fstream[{}] Master finished sending files_nr={} files={} targets={} send_size={} bw={}",
ops_id, sources.size(), sources, targets, ops_total_size, get_bw(ops_total_size, ops_start_time));
}
co_return ops_total_size;
}
future<stream_files_response> tablet_stream_files_handler(replica::database& db, netw::messaging_service& ms, streaming::stream_files_request req, host2ip_t host2ip) {
stream_files_response resp;
auto& table = db.find_column_family(req.table);
auto sstables = co_await table.take_storage_snapshot(req.range);
co_await utils::get_local_injector().inject("order_sstables_for_streaming", [&sstables] (auto& handler) -> future<> {
if (sstables.size() == 3) {
// make sure the sstables are ordered so that the sstable containing shadowed data is streamed last
const std::string_view shadowed_file = handler.template get<std::string_view>("shadowed_file").value();
for (int index: {0, 1}) {
if (sstables[index].sst->component_basename(component_type::Data) == shadowed_file) {
std::swap(sstables[index], sstables[2]);
}
}
}
return make_ready_future<>();
});
auto files = std::list<stream_blob_info>();
sstables::sstable_generation_generator sst_gen(0);
for (auto& sst_snapshot : sstables) {
auto& sst = sst_snapshot.sst;
// stable state (across files) is a must for load to work on destination
auto sst_state = sst->state();
auto sources = create_stream_sources(sst_snapshot);
auto newgen = fmt::to_string(sst_gen(sstables::uuid_identifiers::yes));
for (auto&& s : sources) {
auto oldname = s->component_basename();
auto newname = get_sstable_name_with_generation(req.ops_id, oldname, newgen);
blogger.debug("fstream[{}] Get name oldname={}, newname={}", req.ops_id, oldname, newname);
auto& info = files.emplace_back();
info.fops = file_ops::stream_sstables;
info.sstable_state = sst_state;
info.filename = std::move(newname);
info.source = [s = std::move(s)](const file_input_stream_options& options) {
return s->input(options);
};
}
// ensure we mark the end of each component sequence.
if (!files.empty()) {
files.back().fops = file_ops::load_sstables;
}
}
if (files.empty()) {
co_return resp;
}
blogger.debug("stream_sstables[{}] Started sending sstable_nr={} files_nr={} files={} range={}",
req.ops_id, sstables.size(), files.size(), files, req.range);
auto ops_start_time = std::chrono::steady_clock::now();
size_t stream_bytes = co_await tablet_stream_files(ms, std::move(files), req.targets, req.table, req.ops_id, std::move(host2ip), req.topo_guard);
resp.stream_bytes = stream_bytes;
auto duration = std::chrono::steady_clock::now() - ops_start_time;
blogger.info("stream_sstables[{}] Finished sending sstable_nr={} files_nr={} files={} range={} stream_bytes={} stream_time={} stream_bw={}",
req.ops_id, sstables.size(), files.size(), files, req.range, stream_bytes, duration, get_bw(stream_bytes, ops_start_time));
co_return resp;
}
future<stream_files_response> tablet_stream_files(const file_stream_id& ops_id,
replica::table& table,
const dht::token_range& range,
const locator::host_id& src_host,
const locator::host_id& dst_host,
seastar::shard_id dst_shard_id,
netw::messaging_service& ms,
abort_source& as,
service::frozen_topology_guard topo_guard) {
stream_files_response resp;
std::exception_ptr error;
try {
co_await mark_tablet_stream_start(ops_id);
} catch (...) {
error = std::current_exception();
}
if (!error) {
try {
streaming::stream_files_request req;
req.ops_id = ops_id;
req.keyspace_name = table.schema()->ks_name(),
req.table_name = table.schema()->cf_name();
req.table = table.schema()->id();
req.range = range;
req.targets = std::vector<node_and_shard>{node_and_shard{dst_host, dst_shard_id}};
req.topo_guard = topo_guard;
resp = co_await ser::streaming_rpc_verbs::send_tablet_stream_files(&ms, src_host, as, req);
} catch (...) {
error = std::current_exception();
}
}
co_await mark_tablet_stream_done(ops_id);
if (error) {
std::rethrow_exception(error);
}
co_return resp;
}
}
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