Akashnil created HBASE-6371:
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Summary: Level based compaction
Key: HBASE-6371
URL: https://issues.apache.org/jira/browse/HBASE-6371
Project: HBase
Issue Type: Improvement
Reporter: Akashnil
Assignee: Akashnil
Currently, the compaction selection is not very flexible and is not sensitive
to the hotness of the data. Very old data is likely to be accessed less, and
very recent data is likely to be in the block cache. Both of these
considerations make it inefficient to compact these files as aggressively as
other files. In some use-cases, the access-pattern is particularly obvious even
though there is no way to control the compaction algorithm in those cases.
In the new compaction selection algorithm, we plan to divide the candidate
files into different levels according to oldness of the data that is present in
those files. For each level, parameters like compaction ratio, minimum number
of store-files in each compaction may be different. Number of levels,
time-ranges, and parameters for each level will be configurable online on a
per-column family basis.
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