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From "Ashu Pachauri (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17117) Reversed scan returns deleted versions and breaks RegionLocator
Date Wed, 16 Nov 2016 22:53:58 GMT
Ashu Pachauri created HBASE-17117:

             Summary: Reversed scan returns deleted versions and breaks RegionLocator
                 Key: HBASE-17117
                 URL: https://issues.apache.org/jira/browse/HBASE-17117
             Project: HBase
          Issue Type: Bug
          Components: Scanners
    Affects Versions: 1.3.0
            Reporter: Ashu Pachauri
            Priority: Blocker
             Fix For: 1.3.0

We started seeing clients persistently throwing errors as they were trying to talk to a region
that was non existent (split a few days ago). We verified that the region was deleted from
meta when the split happened.

On performing a raw scan on meta, the deleted version for the split region appears, which
also does on performing a normal reversed scan. Since MetaScanner uses a reversed scan, this
explains why clients see non existent regions.

We also verified that there was no in-memory corrupt state by failing over the master. When
we trigger major compaction on meta, the problem goes away further confirming the fact that
we were seeing deleted versions.

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