10c8ca6ace
Streaming has currently one class, that can be used to contain the read operations being generated by the streaming process. Those reads come from two places: - checksums (if doing repair) - reading mutations to be sent over the wire. Depending on the amount of data we're dealing with, that can generate a significant chunk of data, with seconds worth of backlog, and if we need to have the incoming writes intertwined with those reads, those can take a long time. Even if one node is only acting as a receiver, it may still read a lot for the checksums - if we're talking about repairs, those are coming from the checksums. However, in more complicated failure scenarios, it is not hard to imagine a node that will be both sending and receiving a lot of data. The best way to guarantee progress on both fronts, is to put both kinds of operations into different classes. This patch introduces a new write class, and rename the old read class so it can have a more meaningful name. Signed-off-by: Glauber Costa <glauber@scylladb.com>
107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
/*
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* Copyright 2016 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <seastar/core/future.hh>
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#include <seastar/core/distributed.hh>
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#include <seastar/core/reactor.hh>
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namespace service {
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class priority_manager {
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::io_priority_class _commitlog_priority;
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::io_priority_class _mt_flush_priority;
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::io_priority_class _stream_read_priority;
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::io_priority_class _stream_write_priority;
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::io_priority_class _sstable_query_read;
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::io_priority_class _compaction_priority;
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public:
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const ::io_priority_class&
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commitlog_priority() {
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return _commitlog_priority;
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}
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const ::io_priority_class&
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memtable_flush_priority() {
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return _mt_flush_priority;
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}
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const ::io_priority_class&
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streaming_read_priority() {
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return _stream_read_priority;
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}
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const ::io_priority_class&
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streaming_write_priority() {
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return _stream_write_priority;
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}
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const ::io_priority_class&
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sstable_query_read_priority() {
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return _sstable_query_read;
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}
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const ::io_priority_class&
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compaction_priority() {
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return _compaction_priority;
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}
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priority_manager()
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: _commitlog_priority(engine().register_one_priority_class("commitlog", 100))
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, _mt_flush_priority(engine().register_one_priority_class("memtable_flush", 100))
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, _stream_read_priority(engine().register_one_priority_class("streaming_read", 20))
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, _stream_write_priority(engine().register_one_priority_class("streaming_write", 20))
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, _sstable_query_read(engine().register_one_priority_class("query", 100))
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, _compaction_priority(engine().register_one_priority_class("compaction", 100))
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{}
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};
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priority_manager& get_local_priority_manager();
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const inline ::io_priority_class&
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get_local_commitlog_priority() {
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return get_local_priority_manager().commitlog_priority();
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}
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const inline ::io_priority_class&
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get_local_memtable_flush_priority() {
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return get_local_priority_manager().memtable_flush_priority();
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}
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const inline ::io_priority_class&
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get_local_streaming_read_priority() {
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return get_local_priority_manager().streaming_read_priority();
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}
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const inline ::io_priority_class&
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get_local_streaming_write_priority() {
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return get_local_priority_manager().streaming_write_priority();
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}
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const inline ::io_priority_class&
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get_local_sstable_query_read_priority() {
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return get_local_priority_manager().sstable_query_read_priority();
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}
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const inline ::io_priority_class&
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get_local_compaction_priority() {
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return get_local_priority_manager().compaction_priority();
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}
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}
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