Auto-Split runs only if there are many store files per region
-------------------------------------------------------------
Key: HBASE-4084
URL: https://issues.apache.org/jira/browse/HBASE-4084
Project: HBase
Issue Type: Bug
Components: regionserver
Affects Versions: 0.94.0
Reporter: John Heitmann
Currently, MemStoreFlusher.flushRegion() is the driver of auto-splitting. It
only decides to auto-split a region if there are too many store files per
region. Since it's not guaranteed that the number of store files per region
always grows above the "too many" count before compaction reduces the count,
there is no guarantee that auto-split will ever happen. In my test setup,
compaction seems to always win the race and I haven't noticed auto-splitting
happen once.
It appears that the intention is to have split be mutually exclusive with
compaction, and to have flushing be mutually exclusive with regions badly in
need of compaction, but that resulted in auto-splitting being nested in a
too-restrictive spot.
I'm not sure what the right fix is. Having one method that is essentially
requestSplitOrCompact would probably help readability, and could be the
ultimate solution if it replaces other calls of requestCompaction().
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
