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reduce recordTick overhead in compaction loop

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Summary: It is too expensive to bump ticker to every key/vaue pair

Test Plan: make release

Reviewers: sdong, yhchiang, igor

Reviewed By: igor

Subscribers: leveldb

Differential Revision: https://reviews.facebook.net/D22527
This commit is contained in:
Lei Jin 2014-08-28 17:16:58 -07:00
parent 22a0a60dc4
commit 722d80c374
1 changed files with 33 additions and 5 deletions
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38
db/db_impl.cc
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@ -2634,9 +2634,29 @@ Status DBImpl::ProcessKeyValueCompaction(
compaction_filter = compaction_filter_from_factory.get();
}
int64_t key_drop_user = 0;
int64_t key_drop_newer_entry = 0;
int64_t key_drop_obsolete = 0;
int64_t loop_cnt = 0;
while (input->Valid() && !shutting_down_.Acquire_Load() &&
!cfd->IsDropped()) {
RecordCompactionIOStats();
if (++loop_cnt > 1000) {
if (key_drop_user > 0) {
RecordTick(stats_, COMPACTION_KEY_DROP_USER, key_drop_user);
key_drop_user = 0;
}
if (key_drop_newer_entry > 0) {
RecordTick(stats_, COMPACTION_KEY_DROP_NEWER_ENTRY,
key_drop_newer_entry);
key_drop_newer_entry = 0;
}
if (key_drop_obsolete > 0) {
RecordTick(stats_, COMPACTION_KEY_DROP_OBSOLETE, key_drop_obsolete);
key_drop_obsolete = 0;
}
RecordCompactionIOStats();
loop_cnt = 0;
}
// FLUSH preempts compaction
// TODO(icanadi) this currently only checks if flush is necessary on
// compacting column family. we should also check if flush is necessary on
@ -2717,7 +2737,7 @@ Status DBImpl::ProcessKeyValueCompaction(
ParseInternalKey(key, &ikey);
// no value associated with delete
value.clear();
RecordTick(stats_, COMPACTION_KEY_DROP_USER);
++key_drop_user;
} else if (value_changed) {
value = compaction_filter_value;
}
@ -2741,7 +2761,7 @@ Status DBImpl::ProcessKeyValueCompaction(
// TODO: why not > ?
assert(last_sequence_for_key >= ikey.sequence);
drop = true; // (A)
RecordTick(stats_, COMPACTION_KEY_DROP_NEWER_ENTRY);
++key_drop_newer_entry;
} else if (ikey.type == kTypeDeletion &&
ikey.sequence <= earliest_snapshot &&
compact->compaction->KeyNotExistsBeyondOutputLevel(ikey.user_key)) {
@ -2753,7 +2773,7 @@ Status DBImpl::ProcessKeyValueCompaction(
// few iterations of this loop (by rule (A) above).
// Therefore this deletion marker is obsolete and can be dropped.
drop = true;
RecordTick(stats_, COMPACTION_KEY_DROP_OBSOLETE);
++key_drop_obsolete;
} else if (ikey.type == kTypeMerge) {
if (!merge.HasOperator()) {
LogToBuffer(log_buffer, "Options::merge_operator is null.");
@ -2900,7 +2920,15 @@ Status DBImpl::ProcessKeyValueCompaction(
input->Next();
}
}
if (key_drop_user > 0) {
RecordTick(stats_, COMPACTION_KEY_DROP_USER, key_drop_user);
}
if (key_drop_newer_entry > 0) {
RecordTick(stats_, COMPACTION_KEY_DROP_NEWER_ENTRY, key_drop_newer_entry);
}
if (key_drop_obsolete > 0) {
RecordTick(stats_, COMPACTION_KEY_DROP_OBSOLETE, key_drop_obsolete);
}
RecordCompactionIOStats();
return status;