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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18152) [AMv2] Corrupt Procedure WAL file; procedure data stored out of order
Date Wed, 14 Jun 2017 04:53:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16048704#comment-16048704
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stack commented on HBASE-18152:
-------------------------------

Pushed workaround over in HBASE-18216. Need to figure root cause still.

> [AMv2] Corrupt Procedure WAL file; procedure data stored out of order
> ---------------------------------------------------------------------
>
>                 Key: HBASE-18152
>                 URL: https://issues.apache.org/jira/browse/HBASE-18152
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Region Assignment
>    Affects Versions: 2.0.0
>            Reporter: stack
>            Assignee: stack
>            Priority: Critical
>             Fix For: 2.0.0
>
>         Attachments: HBASE-18152.master.001.patch, pv2-00000000000000000036.log, pv2-00000000000000000047.log,
reading_bad_wal.patch
>
>
> I've seen corruption from time-to-time testing.  Its rare enough. Often we can get over
it but sometimes we can't. It took me a while to capture an instance of corruption. Turns
out we are write to the WAL out-of-order which undoes a basic tenet; that WAL content is ordered
in line w/ execution.
> Below I'll post a corrupt WAL.
> Looking at the write-side, there is a lot going on. I'm not clear on how we could write
out of order. Will try and get more insight. Meantime parking this issue here to fill data
into.



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