Minor compaction does not be started continuiously to compact remaining
storefiles (>compactionThreshold)
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Key: HBASE-3826
URL: https://issues.apache.org/jira/browse/HBASE-3826
Project: HBase
Issue Type: Improvement
Components: regionserver
Affects Versions: 0.90.1
Environment: hbase-0.90.1
hbase-0.90.1-cdh3u0
Reporter: Schubert Zhang
I have a busy region, and there are 43 StoreFiles (>compactionThreshold=8) in
this region.
Now, I stopped the client and stopped putting new data into it. I expect these
StoreFiles to be compacted later.
But, almost one day later, these 43 StoreFiles are still there.
(Note: in my hbase instance, I disabled the major compaction.)
It seems the minor compaction does not be started continuiously to compact
remaining storefiles.
And I checked the code, it is true.
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After more test, a obvious issue/problem is, the complete of a minor compaction
does not check if current storefiles need more minor compaction.
I think this may be a bug or leak.
Try this test:
1. Put many data to a region, then there are 30 storefiles accumulated, because
the backend compaction cannot catch up with the fast puts.
(hbase.hstore.compactionThreshold=8, base.hstore.compaction.max=12)
2. Then stop put.
3. Then, these 30 storefiles are still there for a long time, (no automatic
minor compaction)
4. Submit a compaction on this region, then, only 12 files are compaction, now,
we have 19 storefiles. The minor compaction stopped.
I think, when a minor compaction complete, it should check if the number of
storefiles still many, if so, another minor compaction should start
continuiously.
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