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Date: Thu, 1 Aug 2013 16:05:51 +0000 (UTC)
From: "Himanshu Vashishtha (JIRA)" <jira@apache.org>
To: dev@hbase.apache.org
Message-ID: <JIRA.12661156.1375373146250.152302.1375373151270@arcas>
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Subject: [jira] [Created] (HBASE-9110) Meta region edits not recovered while
 migrating to 0.96.0
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Himanshu Vashishtha created HBASE-9110:
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             Summary: Meta region edits not recovered while migrating to 0.96.0
                 Key: HBASE-9110
                 URL: https://issues.apache.org/jira/browse/HBASE-9110
             Project: HBase
          Issue Type: Bug
          Components: migration
    Affects Versions: 0.94.10, 0.95.2
            Reporter: Himanshu Vashishtha


I was doing the the migration testing from 0.94.11-snapshot to 0.95.0, and faced this issue.

1) Do some edits in meta table (for eg, create a table).

2) Kill the cluster.
(I used kill because we would be doing log splitting when upgrading anyway).

3) There is some dependency on WALs. Upgrade the bits to 0.95.2-snapshot. Start the cluster.
Every thing comes up. I see log splitting happening as expected. But, the WAL-data for meta table is missing.

I could see recovered.edits file for meta created, and placed at the right location. It is just that the new HMaster code tries to recover meta by looking at meta prefix in the log name, and if it didn't find one, just opens the meta region. So, the recovered.edits file, created afterwards, is not honored.

Opening this jira to let folks give their opinions about how to tackle this migration issue.

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