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From "Jean-Daniel Cryans (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5782) Edits can be appended out of seqid order since HBASE-4487
Date Mon, 16 Apr 2012 23:10:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13255172#comment-13255172
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Jean-Daniel Cryans commented on HBASE-5782:
-------------------------------------------

bq. It seems even without HLog.appendNoSync() is is possible that one threads flushes an entire
batch of pending write before an thread that started earlier can get to it.

We didn't have pending writes before, it was inside the sequence file writer, and we append
under lock. Managing those pending writes is what's giving us trouble.
                
> Edits can be appended out of seqid order since HBASE-4487
> ---------------------------------------------------------
>
>                 Key: HBASE-5782
>                 URL: https://issues.apache.org/jira/browse/HBASE-5782
>             Project: HBase
>          Issue Type: Bug
>          Components: wal
>    Affects Versions: 0.94.0
>            Reporter: Gopinathan A
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Blocker
>             Fix For: 0.94.0
>
>         Attachments: 5782.txt, HBASE-5782.patch
>
>
> Create a table with 1000 splits, after the region assignemnt, kill the regionserver wich
contains META table.
> Here few regions are missing after the log splitting and region assigment. HBCK report
shows multiple region holes are got created.
> Same scenario was verified mulitple times in 0.92.1, no issues.

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