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From "Jean-Daniel Cryans (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5161) Compaction algorithm should prioritize reference files
Date Tue, 10 Jan 2012 00:24:39 GMT
Compaction algorithm should prioritize reference files
------------------------------------------------------

                 Key: HBASE-5161
                 URL: https://issues.apache.org/jira/browse/HBASE-5161
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.92.0
            Reporter: Jean-Daniel Cryans
            Priority: Minor
             Fix For: 0.94.0, 0.92.1


I got myself into a state where my table was un-splittable as long as the insert load was
coming in. Emergency flushes because of the low memory barrier don't check the number of store
files so it never blocks, to a point where I had in one case 45 store files and the compactions
were almost never done on the reference files (had 15 of them, went down by one in 20 minutes).
Since you can't split regions with reference files, that region couldn't split and was doomed
to just get more store files until the load stopped.

Marking this as a minor issue, what we really need is a better pushback mechanism but not
prioritizing reference files seems wrong.

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