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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2399) Forced splits only act on the first family in a table
Date Thu, 01 Apr 2010 16:48:27 GMT
Forced splits only act on the first family in a table
-----------------------------------------------------

                 Key: HBASE-2399
                 URL: https://issues.apache.org/jira/browse/HBASE-2399
             Project: Hadoop HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 0.20.3
            Reporter: Jonathan Gray
            Assignee: Jonathan Gray
            Priority: Critical
             Fix For: 0.20.4, 0.21.0


While working on a patch for HBASE-2375, I came across a few bugs in the existing code related
to splits.

If a user triggers a manual split, it flips a forceSplit boolean to true and then triggers
a compaction (this is very similar to my current implementation for HBASE-2375).  However,
the forceSplit boolean is flipped back to false at the beginning of Store.compact().  So the
force split only acts on the first family in the table.  If that Store is not splittable for
some reason (it is empty or has only one row), then the entire region will not be split, regardless
of what is in other families.

Even if there is data in the first family, the midKey is determined based solely on that family.
 If it has two rows and the next family has 1M rows, we pick the split key based on the two
rows.

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