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Remove compact cursor when split sub-compactions (#10289) 

Summary:
In round-robin compaction priority, when splitting the compaction into sub-compactions, the earlier implementation takes into account the compact cursor to have full use of available sub-compactions. But this may result in unbalanced sub-compactions, so we remove this here.  The removal does not affect the cursor-based splitting mechanism within a sub-compaction, and thus the output files are still ensured to be split according to the cursor.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10289

Reviewed By: ajkr

Differential Revision: D37559091

Pulled By: littlepig2013

fbshipit-source-id: b8b45b99f63b09cf873f7f049bcb4ab13871fffc
This commit is contained in:
zczhu 2022-06-30 15:36:46 -07:00 committed by Facebook GitHub Bot
parent 720ab355f9
commit 4f51101d31
1 changed files with 1 additions and 14 deletions
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15
db/compaction/compaction_job.cc
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@ -641,16 +641,6 @@ void CompactionJob::GenSubcompactionBoundaries() {
}
}
Slice output_split_user_key;
const InternalKey output_split_key = c->GetOutputSplitKey();
if (output_split_key.Valid()) {
output_split_user_key = ExtractUserKey(output_split_key.Encode());
bounds.emplace_back(output_split_key.Encode());
} else {
// Empty user key indicates that splitting is not required here
output_split_user_key = Slice();
}
std::sort(bounds.begin(), bounds.end(),
[cfd_comparator](const Slice& a, const Slice& b) -> bool {
return cfd_comparator->Compare(ExtractUserKey(a),
@ -721,10 +711,7 @@ void CompactionJob::GenSubcompactionBoundaries() {
// need to put an end boundary
continue;
}
if (sum >= mean ||
(!output_split_user_key.empty() &&
cfd_comparator->Compare(ExtractUserKey(ranges[i].range.limit),
output_split_user_key) == 0)) {
if (sum >= mean) {
boundaries_.emplace_back(ExtractUserKey(ranges[i].range.limit));
sizes_.emplace_back(sum);
subcompactions--;