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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9307) HalfStoreFileReader needs to handle the faked key else compactions go into infinite loops
Date Thu, 22 Aug 2013 20:43:52 GMT
Jean-Daniel Cryans created HBASE-9307:
-----------------------------------------

             Summary: HalfStoreFileReader needs to handle the faked key else compactions go
into infinite loops
                 Key: HBASE-9307
                 URL: https://issues.apache.org/jira/browse/HBASE-9307
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.95.2
            Reporter: Jean-Daniel Cryans
            Assignee: Jean-Daniel Cryans
            Priority: Critical
             Fix For: 0.98.0, 0.95.3


I found this while trying out 0.95.2

I couldn't shut my cluster down because one region was still compacting, but it already had
been doing that for an hour and it only had 80MBs of data.

Debugging I saw that it was a post-split compaction, specifically for the top part of the
HFiles, and that it was just spinning on the first entry in the file.

Eventually I saw that the anonymous HFileScanner inside HalfStoreFileReader.getScanner (that's
so dirty) wasn't handling HConstants.INDEX_KEY_MAGIC in seekTo() when calling this:

bq. this.delegate.seekTo(splitkey)

Instead it would treat this as if the split key wasn't in the file, but still seek back to
the beginning of the file *then read on from there*.

During the compaction it would see a KV that's not even part of the region, and it just tries
to find the correct block over and over again.

This came from HBASE-7845.

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