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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5782) Edits can be appended out of seqid order since HBASE-4487
Date Tue, 17 Apr 2012 23:52:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13256072#comment-13256072
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Lars Hofhansl commented on HBASE-5782:
--------------------------------------

Did some more tests with HLogPerformanceEvaluation (and my patch):

10 threads, 100000 iterations: with patch: 42s, without patch: 41s
5 threads, 200000 iterations:  with patch: 46s, without patch: 44s
2 threads, 200000 iterations:  with patch: 46s, without patch: 44s

So for fewer threads my patch is slightly slower.

So... What do we do? :)
                
> 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-lars-v2.txt, 5782-sketch.txt, 5782.txt, 5782.unfinished-stack.txt,
HBASE-5782.patch, hbase-5782.txt
>
>
> 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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