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Enable subcompactions in manual level-based compaction

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Summary:
This is the simplest way I could think of to speed up `CompactRange`. It works but isn't that optimal because it relies on the same `max_compaction_bytes` and `max_subcompactions` options that are used in other places. If it turns out to be useful we can allow overriding these in `CompactRangeOptions` in the future.
Closes https://github.com/facebook/rocksdb/pull/3549

Differential Revision: D7117634

Pulled By: ajkr

fbshipit-source-id: d0cd03d6bd0d2fd7ea3fb13cd3b8bf7c47d11e42
This commit is contained in:
Andrew Kryczka 2018-03-06 12:41:37 -08:00 committed by Facebook Github Bot
parent 3462c94be7
commit 20c508c1ed
2 changed files with 3 additions and 1 deletions
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1
HISTORY.md
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@ -6,6 +6,7 @@
### New Features
* Avoid unnecessarily flushing in `CompactRange()` when the range specified by the user does not overlap unflushed memtables.
* If `ColumnFamilyOptions::max_subcompactions` is set greater than one, we now parallelize large manual level-based compactions.
* Add "rocksdb.live-sst-files-size" DB property to return total bytes of all SST files belong to the latest LSM tree.
### Bug Fixes

3
db/compaction.cc
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@ -446,7 +446,8 @@ bool Compaction::ShouldFormSubcompactions() const {
return false;
}
if (cfd_->ioptions()->compaction_style == kCompactionStyleLevel) {
return start_level_ == 0 && output_level_ > 0 && !IsOutputLevelEmpty();
return (start_level_ == 0 || is_manual_compaction_) && output_level_ > 0 &&
!IsOutputLevelEmpty();
} else if (cfd_->ioptions()->compaction_style == kCompactionStyleUniversal) {
return number_levels_ > 1 && output_level_ > 0;
} else {