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distributed_loader.cc
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distributed_loader.cc
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/*
* Copyright (C) 2018-present ScyllaDB
*/
/*
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#include <iterator>
#include <seastar/core/coroutine.hh>
#include <seastar/core/smp.hh>
#include <seastar/coroutine/maybe_yield.hh>
#include <seastar/coroutine/parallel_for_each.hh>
#include <seastar/util/closeable.hh>
#include "distributed_loader.hh"
#include "replica/database.hh"
#include "replica/global_table_ptr.hh"
#include "db/config.hh"
#include "db/extensions.hh"
#include "db/system_keyspace.hh"
#include "db/system_distributed_keyspace.hh"
#include "db/schema_tables.hh"
#include "utils/lister.hh"
#include "compaction/compaction.hh"
#include "compaction/compaction_manager.hh"
#include "sstables/sstables.hh"
#include "sstables/sstables_manager.hh"
#include "sstables/sstable_directory.hh"
#include "service/priority_manager.hh"
#include "auth/common.hh"
#include "tracing/trace_keyspace_helper.hh"
#include "db/view/view_update_checks.hh"
#include <unordered_map>
#include <boost/range/adaptor/map.hpp>
#include <boost/range/algorithm/min_element.hpp>
#include "db/view/view_update_generator.hh"
#include "utils/directories.hh"
extern logging::logger dblog;
static const std::unordered_set<std::string_view> system_keyspaces = {
db::system_keyspace::NAME, db::schema_tables::NAME
};
// Not super nice. Adding statefulness to the file.
static std::unordered_set<sstring> load_prio_keyspaces;
static bool population_started = false;
void replica::distributed_loader::mark_keyspace_as_load_prio(const sstring& ks) {
assert(!population_started);
load_prio_keyspaces.insert(ks);
}
bool is_system_keyspace(std::string_view name) {
return system_keyspaces.contains(name);
}
bool is_load_prio_keyspace(std::string_view name) {
return load_prio_keyspaces.contains(sstring(name));
}
static const std::unordered_set<std::string_view> internal_keyspaces = {
db::system_distributed_keyspace::NAME,
db::system_distributed_keyspace::NAME_EVERYWHERE,
db::system_keyspace::NAME,
db::schema_tables::NAME,
auth::meta::AUTH_KS,
tracing::trace_keyspace_helper::KEYSPACE_NAME
};
bool is_internal_keyspace(std::string_view name) {
return internal_keyspaces.contains(name);
}
namespace replica {
static io_error_handler error_handler_for_upload_dir() {
return [] (std::exception_ptr eptr) {
// do nothing about sstable exception and caller will just rethrow it.
};
}
io_error_handler error_handler_gen_for_upload_dir(disk_error_signal_type& dummy) {
return error_handler_for_upload_dir();
}
future<>
distributed_loader::process_sstable_dir(sharded<sstables::sstable_directory>& dir, sstables::sstable_directory::process_flags flags) {
co_await dir.invoke_on(0, [] (const sstables::sstable_directory& d) {
return utils::directories::verify_owner_and_mode(d.sstable_dir());
});
if (flags.garbage_collect) {
co_await dir.invoke_on(0, [] (sstables::sstable_directory& d) {
return d.garbage_collect();
});
}
co_await dir.invoke_on_all([&dir, flags] (sstables::sstable_directory& d) -> future<> {
// Supposed to be called with the node either down or on behalf of maintenance tasks
// like nodetool refresh
co_await d.process_sstable_dir(flags);
co_await d.move_foreign_sstables(dir);
});
co_await dir.invoke_on_all(&sstables::sstable_directory::commit_directory_changes);
}
future<>
distributed_loader::lock_table(sharded<sstables::sstable_directory>& dir, sharded<replica::database>& db, sstring ks_name, sstring cf_name) {
return dir.invoke_on_all([&db, ks_name, cf_name] (sstables::sstable_directory& d) {
auto& table = db.local().find_column_family(ks_name, cf_name);
d.store_phaser(table.write_in_progress());
return make_ready_future<>();
});
}
// Helper structure for resharding.
//
// Describes the sstables (represented by their foreign_sstable_open_info) that are shared and
// need to be resharded. Each shard will keep one such descriptor, that contains the list of
// SSTables assigned to it, and their total size. The total size is used to make sure we are
// fairly balancing SSTables among shards.
struct reshard_shard_descriptor {
sstables::sstable_directory::sstable_open_info_vector info_vec;
uint64_t uncompressed_data_size = 0;
bool total_size_smaller(const reshard_shard_descriptor& rhs) const {
return uncompressed_data_size < rhs.uncompressed_data_size;
}
uint64_t size() const {
return uncompressed_data_size;
}
};
// Collects shared SSTables from all shards and sstables that require cleanup and returns a vector containing them all.
// This function assumes that the list of SSTables can be fairly big so it is careful to
// manipulate it in a do_for_each loop (which yields) instead of using standard accumulators.
future<sstables::sstable_directory::sstable_open_info_vector>
collect_all_shared_sstables(sharded<sstables::sstable_directory>& dir, sharded<replica::database>& db, sstring ks_name, sstring table_name, compaction::owned_ranges_ptr owned_ranges_ptr) {
auto info_vec = sstables::sstable_directory::sstable_open_info_vector();
// We want to make sure that each distributed object reshards about the same amount of data.
// Each sharded object has its own shared SSTables. We can use a clever algorithm in which they
// all distributely figure out which SSTables to exchange, but we'll keep it simple and move all
// their foreign_sstable_open_info to a coordinator (the shard who called this function). We can
// move in bulk and that's efficient. That shard can then distribute the work among all the
// others who will reshard.
auto coordinator = this_shard_id();
// We will first move all of the foreign open info to temporary storage so that we can sort
// them. We want to distribute bigger sstables first.
const auto* sorted_owned_ranges_ptr = owned_ranges_ptr.get();
co_await dir.invoke_on_all([&] (sstables::sstable_directory& d) -> future<> {
auto shared_sstables = d.retrieve_shared_sstables();
sstables::sstable_directory::sstable_open_info_vector need_cleanup;
if (sorted_owned_ranges_ptr) {
co_await d.filter_sstables([&] (sstables::shared_sstable sst) -> future<bool> {
if (needs_cleanup(sst, *sorted_owned_ranges_ptr)) {
need_cleanup.push_back(co_await sst->get_open_info());
co_return false;
}
co_return true;
});
}
if (shared_sstables.empty() && need_cleanup.empty()) {
co_return;
}
co_await smp::submit_to(coordinator, [&] () -> future<> {
info_vec.reserve(info_vec.size() + shared_sstables.size() + need_cleanup.size());
for (auto& info : shared_sstables) {
info_vec.emplace_back(std::move(info));
co_await coroutine::maybe_yield();
}
for (auto& info : need_cleanup) {
info_vec.emplace_back(std::move(info));
co_await coroutine::maybe_yield();
}
});
});
co_return info_vec;
}
// Given a vector of shared sstables to be resharded, distribute it among all shards.
// The vector is first sorted to make sure that we are moving the biggest SSTables first.
//
// Returns a reshard_shard_descriptor per shard indicating the work that each shard has to do.
future<std::vector<reshard_shard_descriptor>>
distribute_reshard_jobs(sstables::sstable_directory::sstable_open_info_vector source) {
auto destinations = std::vector<reshard_shard_descriptor>(smp::count);
std::sort(source.begin(), source.end(), [] (const sstables::foreign_sstable_open_info& a, const sstables::foreign_sstable_open_info& b) {
// Sort on descending SSTable sizes.
return a.uncompressed_data_size > b.uncompressed_data_size;
});
for (auto& info : source) {
// Choose the stable shard owner with the smallest amount of accumulated work.
// Note that for sstables that need cleanup via resharding, owners may contain
// a single shard.
auto shard_it = boost::min_element(info.owners, [&] (const shard_id& lhs, const shard_id& rhs) {
return destinations[lhs].total_size_smaller(destinations[rhs]);
});
auto& dest = destinations[*shard_it];
dest.uncompressed_data_size += info.uncompressed_data_size;
dest.info_vec.push_back(std::move(info));
co_await coroutine::maybe_yield();
}
co_return destinations;
}
// reshards a collection of SSTables.
//
// A reference to the compaction manager must be passed so we can register with it. Knowing
// which table is being processed is a requirement of the compaction manager, so this must be
// passed too.
//
// We will reshard max_sstables_per_job at once.
//
// A creator function must be passed that will create an SSTable object in the correct shard,
// and an I/O priority must be specified.
future<> reshard(sstables::sstable_directory& dir, sstables::sstable_directory::sstable_open_info_vector shared_info, replica::table& table,
sstables::compaction_sstable_creator_fn creator, io_priority_class iop, compaction::owned_ranges_ptr owned_ranges_ptr)
{
// Resharding doesn't like empty sstable sets, so bail early. There is nothing
// to reshard in this shard.
if (shared_info.empty()) {
co_return;
}
// We want to reshard many SSTables at a time for efficiency. However if we have too many we may
// be risking OOM.
auto max_sstables_per_job = table.schema()->max_compaction_threshold();
auto num_jobs = (shared_info.size() + max_sstables_per_job - 1) / max_sstables_per_job;
auto sstables_per_job = shared_info.size() / num_jobs;
std::vector<std::vector<sstables::shared_sstable>> buckets;
buckets.reserve(num_jobs);
buckets.emplace_back();
co_await coroutine::parallel_for_each(shared_info, [&] (sstables::foreign_sstable_open_info& info) -> future<> {
auto sst = co_await dir.load_foreign_sstable(info);
// Last bucket gets leftover SSTables
if ((buckets.back().size() >= sstables_per_job) && (buckets.size() < num_jobs)) {
buckets.emplace_back();
}
buckets.back().push_back(std::move(sst));
});
// There is a semaphore inside the compaction manager in run_resharding_jobs. So we
// parallel_for_each so the statistics about pending jobs are updated to reflect all
// jobs. But only one will run in parallel at a time
auto& t = table.as_table_state();
co_await coroutine::parallel_for_each(buckets, [&] (std::vector<sstables::shared_sstable>& sstlist) mutable {
return table.get_compaction_manager().run_custom_job(table.as_table_state(), sstables::compaction_type::Reshard, "Reshard compaction", [&] (sstables::compaction_data& info) -> future<> {
sstables::compaction_descriptor desc(sstlist, iop);
desc.options = sstables::compaction_type_options::make_reshard();
desc.creator = creator;
desc.owned_ranges = owned_ranges_ptr;
auto result = co_await sstables::compact_sstables(std::move(desc), info, t);
// input sstables are moved, to guarantee their resources are released once we're done
// resharding them.
co_await when_all_succeed(dir.collect_output_unshared_sstables(std::move(result.new_sstables), sstables::sstable_directory::can_be_remote::yes), dir.remove_sstables(std::move(sstlist))).discard_result();
});
});
}
future<> run_resharding_jobs(sharded<sstables::sstable_directory>& dir, std::vector<reshard_shard_descriptor> reshard_jobs,
sharded<replica::database>& db, sstring ks_name, sstring table_name, sstables::compaction_sstable_creator_fn creator,
io_priority_class iop, compaction::owned_ranges_ptr owned_ranges_ptr) {
uint64_t total_size = boost::accumulate(reshard_jobs | boost::adaptors::transformed(std::mem_fn(&reshard_shard_descriptor::size)), uint64_t(0));
if (total_size == 0) {
co_return;
}
auto start = std::chrono::steady_clock::now();
dblog.info("Resharding {} for {}.{}", sstables::pretty_printed_data_size(total_size), ks_name, table_name);
co_await dir.invoke_on_all(coroutine::lambda([&] (sstables::sstable_directory& d) -> future<> {
auto& table = db.local().find_column_family(ks_name, table_name);
auto info_vec = std::move(reshard_jobs[this_shard_id()].info_vec);
// make shard-local copy of owned_ranges
compaction::owned_ranges_ptr local_owned_ranges_ptr;
if (owned_ranges_ptr) {
local_owned_ranges_ptr = make_lw_shared<const dht::token_range_vector>(*owned_ranges_ptr);
}
co_await ::replica::reshard(d, std::move(info_vec), table, creator, iop, std::move(local_owned_ranges_ptr));
co_await d.move_foreign_sstables(dir);
}));
auto duration = std::chrono::duration_cast<std::chrono::duration<float>>(std::chrono::steady_clock::now() - start);
dblog.info("Resharded {} for {}.{} in {:.2f} seconds, {}", sstables::pretty_printed_data_size(total_size), ks_name, table_name, duration.count(), sstables::pretty_printed_throughput(total_size, duration));
}
// Global resharding function. Done in two parts:
// - The first part spreads the foreign_sstable_open_info across shards so that all of them are
// resharding about the same amount of data
// - The second part calls each shard's distributed object to reshard the SSTables they were
// assigned.
future<>
distributed_loader::reshard(sharded<sstables::sstable_directory>& dir, sharded<replica::database>& db, sstring ks_name, sstring table_name, sstables::compaction_sstable_creator_fn creator, io_priority_class iop, compaction::owned_ranges_ptr owned_ranges_ptr) {
auto all_jobs = co_await collect_all_shared_sstables(dir, db, ks_name, table_name, owned_ranges_ptr);
auto destinations = co_await distribute_reshard_jobs(std::move(all_jobs));
co_await run_resharding_jobs(dir, std::move(destinations), db, ks_name, table_name, std::move(creator), iop, std::move(owned_ranges_ptr));
}
future<sstables::sstable::version_types>
highest_version_seen(sharded<sstables::sstable_directory>& dir, sstables::sstable_version_types system_version) {
using version = sstables::sstable_version_types;
return dir.map_reduce0(std::mem_fn(&sstables::sstable_directory::highest_version_seen), system_version, [] (version a, version b) {
return std::max(a, b);
});
}
using sstable_filter_func_t = std::function<bool (const sstables::shared_sstable&)>;
future<uint64_t> reshape(sstables::sstable_directory& dir, replica::table& table, sstables::compaction_sstable_creator_fn creator,
sstables::reshape_mode mode, sstable_filter_func_t filter, io_priority_class iop)
{
uint64_t reshaped_size = 0;
while (true) {
auto reshape_candidates = boost::copy_range<std::vector<sstables::shared_sstable>>(dir.get_unshared_local_sstables()
| boost::adaptors::filtered([&filter] (const auto& sst) {
return filter(sst);
}));
auto desc = table.get_compaction_strategy().get_reshaping_job(std::move(reshape_candidates), table.schema(), iop, mode);
if (desc.sstables.empty()) {
break;
}
if (!reshaped_size) {
dblog.info("Table {}.{} with compaction strategy {} found SSTables that need reshape. Starting reshape process", table.schema()->ks_name(), table.schema()->cf_name(), table.get_compaction_strategy().name());
}
std::vector<sstables::shared_sstable> sstlist;
for (auto& sst : desc.sstables) {
reshaped_size += sst->data_size();
sstlist.push_back(sst);
}
desc.creator = creator;
std::exception_ptr ex;
try {
co_await table.get_compaction_manager().run_custom_job(table.as_table_state(), sstables::compaction_type::Reshape, "Reshape compaction", [&dir, &table, sstlist = std::move(sstlist), desc = std::move(desc)] (sstables::compaction_data& info) mutable -> future<> {
sstables::compaction_result result = co_await sstables::compact_sstables(std::move(desc), info, table.as_table_state());
co_await dir.remove_unshared_sstables(std::move(sstlist));
co_await dir.collect_output_unshared_sstables(std::move(result.new_sstables), sstables::sstable_directory::can_be_remote::no);
});
} catch (...) {
ex = std::current_exception();
}
if (ex != nullptr) {
try {
std::rethrow_exception(std::move(ex));
} catch (sstables::compaction_stopped_exception& e) {
dblog.info("Table {}.{} with compaction strategy {} had reshape successfully aborted.", table.schema()->ks_name(), table.schema()->cf_name(), table.get_compaction_strategy().name());
break;
} catch (...) {
dblog.info("Reshape failed for Table {}.{} with compaction strategy {} due to {}", table.schema()->ks_name(), table.schema()->cf_name(), table.get_compaction_strategy().name(), std::current_exception());
break;
}
}
co_await coroutine::maybe_yield();
}
co_return reshaped_size;
}
future<>
distributed_loader::reshape(sharded<sstables::sstable_directory>& dir, sharded<replica::database>& db, sstables::reshape_mode mode,
sstring ks_name, sstring table_name, sstables::compaction_sstable_creator_fn creator,
std::function<bool (const sstables::shared_sstable&)> filter, io_priority_class iop) {
auto start = std::chrono::steady_clock::now();
auto total_size = co_await dir.map_reduce0([&db, ks_name = std::move(ks_name), table_name = std::move(table_name), creator = std::move(creator), mode, filter, iop] (sstables::sstable_directory& d) {
auto& table = db.local().find_column_family(ks_name, table_name);
return ::replica::reshape(d, table, creator, mode, filter, iop);
}, uint64_t(0), std::plus<uint64_t>());
if (total_size > 0) {
auto duration = std::chrono::duration_cast<std::chrono::duration<float>>(std::chrono::steady_clock::now() - start);
dblog.info("Reshaped {} in {:.2f} seconds, {}", sstables::pretty_printed_data_size(total_size), duration.count(), sstables::pretty_printed_throughput(total_size, duration));
}
}
// Loads SSTables into the main directory (or staging) and returns how many were loaded
future<size_t>
distributed_loader::make_sstables_available(sstables::sstable_directory& dir, sharded<replica::database>& db,
sharded<db::view::view_update_generator>& view_update_generator, bool needs_view_update, sstring ks, sstring cf) {
auto& table = db.local().find_column_family(ks, cf);
auto new_sstables = std::vector<sstables::shared_sstable>();
co_await dir.do_for_each_sstable([&table, needs_view_update, &new_sstables] (sstables::shared_sstable sst) -> future<> {
auto gen = table.calculate_generation_for_new_table();
dblog.trace("Loading {} into {}, new generation {}", sst->get_filename(), needs_view_update ? "staging" : "base", gen);
co_await sst->pick_up_from_upload(!needs_view_update ? sstables::normal_dir : sstables::staging_dir, gen);
// When loading an imported sst, set level to 0 because it may overlap with existing ssts on higher levels.
sst->set_sstable_level(0);
new_sstables.push_back(std::move(sst));
});
// nothing loaded
if (new_sstables.empty()) {
co_return 0;
}
co_await table.add_sstables_and_update_cache(new_sstables).handle_exception([&table] (std::exception_ptr ep) {
dblog.error("Failed to load SSTables for {}.{}: {}. Aborting.", table.schema()->ks_name(), table.schema()->cf_name(), ep);
abort();
});
co_await coroutine::parallel_for_each(new_sstables, [&view_update_generator, &table] (sstables::shared_sstable sst) -> future<> {
if (sst->requires_view_building()) {
co_await view_update_generator.local().register_staging_sstable(sst, table.shared_from_this());
}
});
co_return new_sstables.size();
}
future<>
distributed_loader::process_upload_dir(distributed<replica::database>& db, distributed<db::system_distributed_keyspace>& sys_dist_ks,
distributed<db::view::view_update_generator>& view_update_generator, sstring ks, sstring cf) {
seastar::thread_attributes attr;
attr.sched_group = db.local().get_streaming_scheduling_group();
return seastar::async(std::move(attr), [&db, &view_update_generator, &sys_dist_ks, ks = std::move(ks), cf = std::move(cf)] {
auto global_table = get_table_on_all_shards(db, ks, cf).get0();
sharded<sstables::sstable_directory> directory;
auto upload = fs::path(global_table->dir()) / sstables::upload_dir;
directory.start(
sharded_parameter([&global_table] { return std::ref(global_table->get_sstables_manager()); }),
sharded_parameter([&global_table] { return global_table->schema(); }),
sharded_parameter([&global_table] { return global_table->get_storage_options_ptr(); }),
upload, service::get_local_streaming_priority(),
&error_handler_gen_for_upload_dir
).get();
auto stop_directory = deferred_stop(directory);
lock_table(directory, db, ks, cf).get();
sstables::sstable_directory::process_flags flags {
.need_mutate_level = true,
.enable_dangerous_direct_import_of_cassandra_counters = db.local().get_config().enable_dangerous_direct_import_of_cassandra_counters(),
.allow_loading_materialized_view = false,
};
process_sstable_dir(directory, flags).get();
sharded<sstables::sstable_generation_generator> sharded_gen;
auto highest_generation = highest_generation_seen(directory).get0().value_or(
sstables::generation_type{0});
sharded_gen.start(highest_generation.as_int()).get();
auto stop_generator = deferred_stop(sharded_gen);
auto make_sstable = [&] (shard_id shard) {
auto& sstm = global_table->get_sstables_manager();
auto generation = sharded_gen.invoke_on(shard, [] (auto& gen) { return gen(); }).get();
return sstm.make_sstable(global_table->schema(), global_table->get_storage_options(),
upload.native(), generation, sstm.get_highest_supported_format(),
sstables::sstable_format_types::big, gc_clock::now(), &error_handler_gen_for_upload_dir);
};
// Pass owned_ranges_ptr to reshard to piggy-back cleanup on the resharding compaction.
// Note that needs_cleanup() is inaccurate and may return false positives,
// maybe triggerring resharding+cleanup unnecessarily for some sstables.
// But this is resharding on refresh (sstable loading via upload dir),
// which will usually require resharding anyway.
//
// FIXME: take multiple compaction groups into account
// - segregate resharded tables into compaction groups
// - split the keyspace local ranges per compaction_group as done in table::perform_cleanup_compaction
// so that cleanup can be considered per compaction group
auto owned_ranges_ptr = compaction::make_owned_ranges_ptr(db.local().get_keyspace_local_ranges(ks));
reshard(directory, db, ks, cf, make_sstable,
service::get_local_streaming_priority(),
owned_ranges_ptr).get();
reshape(directory, db, sstables::reshape_mode::strict, ks, cf, make_sstable,
[] (const sstables::shared_sstable&) { return true; },
service::get_local_streaming_priority()).get();
// Move to staging directory to avoid clashes with future uploads. Unique generation number ensures no collisions.
const bool use_view_update_path = db::view::check_needs_view_update_path(sys_dist_ks.local(), db.local().get_token_metadata(), *global_table, streaming::stream_reason::repair).get0();
size_t loaded = directory.map_reduce0([&db, ks, cf, use_view_update_path, &view_update_generator] (sstables::sstable_directory& dir) {
return make_sstables_available(dir, db, view_update_generator, use_view_update_path, ks, cf);
}, size_t(0), std::plus<size_t>()).get0();
dblog.info("Loaded {} SSTables", loaded);
});
}
future<std::tuple<table_id, std::vector<std::vector<sstables::shared_sstable>>>>
distributed_loader::get_sstables_from_upload_dir(distributed<replica::database>& db, sstring ks, sstring cf, sstables::sstable_open_config cfg) {
return seastar::async([&db, ks = std::move(ks), cf = std::move(cf), cfg] {
auto global_table = get_table_on_all_shards(db, ks, cf).get0();
sharded<sstables::sstable_directory> directory;
auto table_id = global_table->schema()->id();
auto upload = fs::path(global_table->dir()) / sstables::upload_dir;
directory.start(
sharded_parameter([&global_table] { return std::ref(global_table->get_sstables_manager()); }),
sharded_parameter([&global_table] { return global_table->schema(); }),
sharded_parameter([&global_table] { return global_table->get_storage_options_ptr(); }),
upload, service::get_local_streaming_priority(),
&error_handler_gen_for_upload_dir
).get();
auto stop = deferred_stop(directory);
std::vector<std::vector<sstables::shared_sstable>> sstables_on_shards(smp::count);
lock_table(directory, db, ks, cf).get();
sstables::sstable_directory::process_flags flags {
.need_mutate_level = true,
.enable_dangerous_direct_import_of_cassandra_counters = db.local().get_config().enable_dangerous_direct_import_of_cassandra_counters(),
.allow_loading_materialized_view = false,
.sort_sstables_according_to_owner = false,
.sstable_open_config = cfg,
};
process_sstable_dir(directory, flags).get();
directory.invoke_on_all([&sstables_on_shards] (sstables::sstable_directory& d) mutable {
sstables_on_shards[this_shard_id()] = d.get_unsorted_sstables();
}).get();
return std::make_tuple(table_id, std::move(sstables_on_shards));
});
}
class table_populator {
distributed<replica::database>& _db;
sstring _ks;
sstring _cf;
global_table_ptr _global_table;
fs::path _base_path;
std::unordered_map<sstring, lw_shared_ptr<sharded<sstables::sstable_directory>>> _sstable_directories;
sstables::sstable_version_types _highest_version = sstables::oldest_writable_sstable_format;
std::optional<sstables::generation_type> _highest_generation;
public:
table_populator(global_table_ptr ptr, distributed<replica::database>& db, sstring ks, sstring cf)
: _db(db)
, _ks(std::move(ks))
, _cf(std::move(cf))
, _global_table(std::move(ptr))
, _base_path(_global_table->dir())
{}
~table_populator() {
// All directories must have been stopped
// using table_populator::stop()
assert(_sstable_directories.empty());
}
future<> start() {
assert(this_shard_id() == 0);
for (auto subdir : { "", sstables::staging_dir, sstables::quarantine_dir }) {
co_await start_subdir(subdir);
}
co_await smp::invoke_on_all([this] {
_global_table->update_sstables_known_generation(_highest_generation);
return _global_table->disable_auto_compaction();
});
co_await populate_subdir(sstables::staging_dir, allow_offstrategy_compaction::no);
co_await populate_subdir(sstables::quarantine_dir, allow_offstrategy_compaction::no, must_exist::no);
co_await populate_subdir("", allow_offstrategy_compaction::yes);
}
future<> stop() {
for (auto it = _sstable_directories.begin(); it != _sstable_directories.end(); it = _sstable_directories.erase(it)) {
co_await it->second->stop();
}
}
private:
fs::path get_path(std::string_view subdir) {
return subdir.empty() ? _base_path : _base_path / subdir;
}
using allow_offstrategy_compaction = bool_class<struct allow_offstrategy_compaction_tag>;
using must_exist = bool_class<struct must_exist_tag>;
future<> populate_subdir(sstring subdir, allow_offstrategy_compaction, must_exist = must_exist::yes);
future<> start_subdir(sstring subdir);
};
future<> table_populator::start_subdir(sstring subdir) {
sstring sstdir = get_path(subdir).native();
if (!co_await file_exists(sstdir)) {
co_return;
}
auto dptr = make_lw_shared<sharded<sstables::sstable_directory>>();
auto& directory = *dptr;
auto& global_table = _global_table;
auto& db = _db;
co_await directory.start(
sharded_parameter([&global_table] { return std::ref(global_table->get_sstables_manager()); }),
sharded_parameter([&global_table] { return global_table->schema(); }),
sharded_parameter([&global_table] { return global_table->get_storage_options_ptr(); }),
fs::path(sstdir), default_priority_class(),
default_io_error_handler_gen()
);
// directory must be stopped using table_populator::stop below
_sstable_directories[subdir] = dptr;
co_await distributed_loader::lock_table(directory, _db, _ks, _cf);
sstables::sstable_directory::process_flags flags {
.throw_on_missing_toc = true,
.enable_dangerous_direct_import_of_cassandra_counters = db.local().get_config().enable_dangerous_direct_import_of_cassandra_counters(),
.allow_loading_materialized_view = true,
.garbage_collect = true,
};
co_await distributed_loader::process_sstable_dir(directory, flags);
// If we are resharding system tables before we can read them, we will not
// know which is the highest format we support: this information is itself stored
// in the system tables. In that case we'll rely on what we find on disk: we'll
// at least not downgrade any files. If we already know that we support a higher
// format than the one we see then we use that.
auto sys_format = global_table->get_sstables_manager().get_highest_supported_format();
auto sst_version = co_await highest_version_seen(directory, sys_format);
auto generation = co_await highest_generation_seen(directory);
_highest_version = std::max(sst_version, _highest_version);
if (generation) {
_highest_generation = _highest_generation ?
std::max(*generation, *_highest_generation) :
*generation;
}
}
sstables::shared_sstable make_sstable(replica::table& table, fs::path dir, sstables::generation_type generation, sstables::sstable_version_types v) {
return table.get_sstables_manager().make_sstable(table.schema(), table.get_storage_options(), dir.native(), generation, v, sstables::sstable_format_types::big);
}
future<> table_populator::populate_subdir(sstring subdir, allow_offstrategy_compaction do_allow_offstrategy_compaction, must_exist dir_must_exist) {
auto sstdir = get_path(subdir);
dblog.debug("Populating {}/{}/{} allow_offstrategy_compaction={} must_exist={}", _ks, _cf, sstdir, do_allow_offstrategy_compaction, dir_must_exist);
if (!_sstable_directories.contains(subdir)) {
if (dir_must_exist) {
throw std::runtime_error(format("Populating {}/{} failed: {} does not exist", _ks, _cf, sstdir));
}
co_return;
}
auto& directory = *_sstable_directories.at(subdir);
co_await distributed_loader::reshard(directory, _db, _ks, _cf, [this, sstdir] (shard_id shard) mutable {
auto gen = smp::submit_to(shard, [this] () {
return _global_table->calculate_generation_for_new_table();
}).get0();
return make_sstable(*_global_table, sstdir, gen, _highest_version);
}, default_priority_class());
// The node is offline at this point so we are very lenient with what we consider
// offstrategy.
// SSTables created by repair may not conform to compaction strategy layout goal
// because data segregation is only performed by compaction
// Instead of reshaping them on boot, let's add them to maintenance set and allow
// off-strategy compaction to reshape them. This will allow node to become online
// ASAP. Given that SSTables with repair origin are disjoint, they can be efficiently
// read from.
auto eligible_for_reshape_on_boot = [] (const sstables::shared_sstable& sst) {
return sst->get_origin() != sstables::repair_origin;
};
co_await distributed_loader::reshape(directory, _db, sstables::reshape_mode::relaxed, _ks, _cf, [this, sstdir] (shard_id shard) {
auto gen = _global_table->calculate_generation_for_new_table();
return make_sstable(*_global_table, sstdir, gen, _highest_version);
}, eligible_for_reshape_on_boot, default_priority_class());
co_await directory.invoke_on_all([this, &eligible_for_reshape_on_boot, do_allow_offstrategy_compaction] (sstables::sstable_directory& dir) -> future<> {
co_await dir.do_for_each_sstable([this, &eligible_for_reshape_on_boot, do_allow_offstrategy_compaction] (sstables::shared_sstable sst) {
auto requires_offstrategy = sstables::offstrategy(do_allow_offstrategy_compaction && !eligible_for_reshape_on_boot(sst));
return _global_table->add_sstable_and_update_cache(sst, requires_offstrategy);
});
if (do_allow_offstrategy_compaction) {
_global_table->trigger_offstrategy_compaction();
}
});
}
future<> distributed_loader::populate_keyspace(distributed<replica::database>& db, sstring datadir, sstring ks_name) {
auto ksdir = datadir + "/" + ks_name;
auto& keyspaces = db.local().get_keyspaces();
auto i = keyspaces.find(ks_name);
if (i == keyspaces.end()) {
dblog.warn("Skipping undefined keyspace: {}", ks_name);
co_return;
}
dblog.info("Populating Keyspace {}", ks_name);
auto& ks = i->second;
auto& column_families = db.local().get_column_families();
co_await coroutine::parallel_for_each(ks.metadata()->cf_meta_data() | boost::adaptors::map_values, [&] (schema_ptr s) -> future<> {
auto uuid = s->id();
lw_shared_ptr<replica::column_family> cf = column_families[uuid];
// System tables (from system and system_schema keyspaces) are loaded in two phases.
// The populate_keyspace function can be called in the second phase for tables that
// were already populated in the first phase.
// This check protects from double-populating them, since every populated cf
// is marked as ready_for_writes.
if (cf->is_ready_for_writes()) {
co_return;
}
sstring cfname = cf->schema()->cf_name();
dblog.info("Keyspace {}: Reading CF {} id={} version={} storage={}", ks_name, cfname, uuid, s->version(), cf->get_storage_options().type_string());
auto gtable = co_await get_table_on_all_shards(db, ks_name, cfname);
auto metadata = table_populator(std::move(gtable), db, ks_name, cfname);
std::exception_ptr ex;
try {
co_await cf->init_storage();
co_await metadata.start();
} catch (...) {
std::exception_ptr eptr = std::current_exception();
std::string msg =
format("Exception while populating keyspace '{}' with column family '{}' from file '{}': {}",
ks_name, cfname, cf->dir(), eptr);
dblog.error("Exception while populating keyspace '{}' with column family '{}' from file '{}': {}",
ks_name, cfname, cf->dir(), eptr);
try {
std::rethrow_exception(eptr);
} catch (sstables::compaction_stopped_exception& e) {
// swallow compaction stopped exception, to allow clean shutdown.
} catch (...) {
ex = std::make_exception_ptr(std::runtime_error(msg.c_str()));
}
}
co_await metadata.stop();
if (ex) {
co_await coroutine::return_exception_ptr(std::move(ex));
}
});
}
future<> distributed_loader::init_system_keyspace(sharded<db::system_keyspace>& sys_ks, distributed<replica::database>& db, distributed<service::storage_service>& ss, sharded<gms::gossiper>& g, sharded<service::raft_group_registry>& raft_gr, db::config& cfg, system_table_load_phase phase) {
population_started = true;
return seastar::async([&sys_ks, &db, &ss, &cfg, &g, &raft_gr, phase] {
sys_ks.invoke_on_all([&db, &ss, &cfg, &g, &raft_gr, phase] (auto& sys_ks) {
return sys_ks.make(db, ss, g, raft_gr, cfg, phase);
}).get();
const auto& cfg = db.local().get_config();
for (auto& data_dir : cfg.data_file_directories()) {
for (auto ksname : system_keyspaces) {
if (db.local().has_keyspace(ksname)) {
distributed_loader::populate_keyspace(db, data_dir, sstring(ksname)).get();
}
}
}
db.invoke_on_all([] (replica::database& db) {
for (auto ksname : system_keyspaces) {
if (!db.has_keyspace(ksname)) {
continue;
}
auto& ks = db.find_keyspace(ksname);
for (auto& pair : ks.metadata()->cf_meta_data()) {
auto cfm = pair.second;
auto& cf = db.find_column_family(cfm);
// During phase2 some tables may have already been
// marked as 'ready for writes' at phase1.
if (!cf.is_ready_for_writes()) {
cf.mark_ready_for_writes();
}
}
}
return make_ready_future<>();
}).get();
});
}
future<> distributed_loader::init_non_system_keyspaces(distributed<replica::database>& db,
distributed<service::storage_proxy>& proxy, sharded<db::system_keyspace>& sys_ks) {
return seastar::async([&db, &proxy, &sys_ks] {
db.invoke_on_all([&proxy, &sys_ks] (replica::database& db) {
return db.parse_system_tables(proxy, sys_ks);
}).get();
const auto& cfg = db.local().get_config();
using ks_dirs = std::unordered_multimap<sstring, sstring>;
ks_dirs dirs;
parallel_for_each(cfg.data_file_directories(), [&dirs] (sstring directory) {
// we want to collect the directories first, so we can get a full set of potential dirs
return lister::scan_dir(directory, lister::dir_entry_types::of<directory_entry_type::directory>(), [&dirs] (fs::path datadir, directory_entry de) {
if (!is_system_keyspace(de.name)) {
dirs.emplace(de.name, datadir.native());
}
return make_ready_future<>();
});
}).get();
for (bool prio_only : { true, false}) {
std::vector<future<>> futures;
// treat "dirs" as immutable to avoid modifying it while still in
// a range-iteration. Also to simplify the "finally"
for (auto i = dirs.begin(); i != dirs.end();) {
auto& ks_name = i->first;
auto j = i++;
/**
* Must process in two phases: Prio and non-prio.
* This looks like it is not needed. And it is not
* in open-source version. But essential for enterprise.
* Do _not_ remove or refactor away.
*/
if (prio_only != cfg.extensions().is_extension_internal_keyspace(ks_name)) {
continue;
}
auto e = dirs.equal_range(ks_name).second;
// might have more than one dir for a keyspace iff data_file_directories is > 1 and
// somehow someone placed sstables in more than one of them for a given ks. (import?)
futures.emplace_back(parallel_for_each(j, e, [&](const std::pair<sstring, sstring>& p) {
auto& datadir = p.second;
return distributed_loader::populate_keyspace(db, datadir, ks_name);
}));
}
when_all_succeed(futures.begin(), futures.end()).discard_result().get();
}
db.invoke_on_all([] (replica::database& db) {
return parallel_for_each(db.get_non_system_column_families(), [] (lw_shared_ptr<replica::table> table) {
// Make sure this is called even if the table is empty
table->mark_ready_for_writes();
return make_ready_future<>();
});
}).get();
});
}
}