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https://issues.apache.org/jira/browse/HBASE-9110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13750782#comment-13750782
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Himanshu Vashishtha commented on HBASE-9110:
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It looks like hbck can help us in situation where meta is not flushed.
On a 0.94.x cluster, I tried migration with some unflushed meta edits
(basically, create table waledits). I killed the meta server before upgrade.
The edits were not there in meta immediately after migration, but appears
correctly after running "bin/hbase hbck -fixAssignments, -fixMeta".
It definitely needs some more testing.
> 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: Sub-task
> Components: migration
> Affects Versions: 0.95.2, 0.94.10
> Reporter: Himanshu Vashishtha
> Priority: Critical
> Fix For: 0.96.0
>
>
> I was doing 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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