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Enable rocksdb read option avoid_unnecessary_blocking_io to avoid unexpected long latency #1903

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merged 4 commits into from
Nov 22, 2023
Merged

Enable rocksdb read option avoid_unnecessary_blocking_io to avoid unexpected long latency #1903

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085794c
avoid unnecessary blocking io on iterater destruction
wanghenshui Nov 22, 2023
915fcd7
add flag
wanghenshui Nov 22, 2023
8d5425f
make default true
wanghenshui Nov 22, 2023
5fb4ab1
Update kvrocks.conf
wanghenshui Nov 22, 2023
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7 changes: 7 additions & 0 deletions kvrocks.conf
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Expand Up @@ -863,5 +863,12 @@ rocksdb.write_options.memtable_insert_hint_per_batch no
# Default: yes
rocksdb.rate_limiter_auto_tuned yes

# Enable this option will schedule the deletion of obsolete files in a background thread
# on iterator destruction. It can reduce the latency if there are many files to be removed.
# see https://github.com/facebook/rocksdb/wiki/IO#avoid-blocking-io
#
# Default: yes
# rocksdb.avoid_unnecessary_blocking_io yes

################################ NAMESPACE #####################################
# namespace.test change.me
1 change: 1 addition & 0 deletions src/config/config.cc
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Expand Up @@ -216,6 +216,7 @@ Config::Config() {
new YesNoField(&rocks_db.level_compaction_dynamic_level_bytes, false)},
{"rocksdb.max_background_jobs", false, new IntField(&rocks_db.max_background_jobs, 4, 0, 32)},
{"rocksdb.rate_limiter_auto_tuned", true, new YesNoField(&rocks_db.rate_limiter_auto_tuned, true)},
{"rocksdb.avoid_unnecessary_blocking_io", true, new YesNoField(&rocks_db.avoid_unnecessary_blocking_io, true)},

/* rocksdb write options */
{"rocksdb.write_options.sync", true, new YesNoField(&rocks_db.write_options.sync, false)},
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1 change: 1 addition & 0 deletions src/config/config.h
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Expand Up @@ -201,6 +201,7 @@ struct Config {
bool level_compaction_dynamic_level_bytes;
int max_background_jobs;
bool rate_limiter_auto_tuned;
bool avoid_unnecessary_blocking_io = true;

struct WriteOptions {
bool sync;
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3 changes: 3 additions & 0 deletions src/storage/storage.cc
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Expand Up @@ -186,6 +186,9 @@ rocksdb::Options Storage::InitRocksDBOptions() {
options.level_compaction_dynamic_level_bytes = config_->rocks_db.level_compaction_dynamic_level_bytes;
options.max_background_jobs = config_->rocks_db.max_background_jobs;

// avoid blocking io on iteration
// see https://github.com/facebook/rocksdb/wiki/IO#avoid-blocking-io
options.avoid_unnecessary_blocking_io = config_->rocks_db.avoid_unnecessary_blocking_io;
return options;
}

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