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Added a parameter to limit the maximum space amplification for universal compaction.

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Summary:
Added a new field called max_size_amplification_ratio in the
CompactionOptionsUniversal structure. This determines the maximum
percentage overhead of space amplification.

The size amplification is defined to be the ratio between the size of
the oldest file to the sum of the sizes of all other files. If the
size amplification exceeds the specified value, then min_merge_width
and max_merge_width are ignored and a full compaction of all files is done.
A value of 10 means that the size a database that stores 100 bytes
of user data could occupy 110 bytes of physical storage.

Test Plan: Unit test DBTest.UniversalCompactionSpaceAmplification added.

Reviewers: haobo, emayanke, xjin

Reviewed By: haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D12825
This commit is contained in:
Dhruba Borthakur
2013-09-09 16:06:10 -07:00
parent e2a093a6c3
commit 4012ca1c7b
7 changed files with 381 additions and 133 deletions
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3
util/options.cc
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@@ -243,6 +243,9 @@ Options::Dump(Logger* log) const
compaction_options_universal.min_merge_width);
Log(log," Options.compaction_options_universal.max_merge_width: %u",
compaction_options_universal.max_merge_width);
Log(log,"Options.compaction_options_universal."
"max_size_amplification_percent: %u",
compaction_options_universal.max_size_amplification_percent);
Log(log," Options.purge_log_after_memtable_flush: %d",
purge_log_after_memtable_flush);
} // Options::Dump