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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11094) Distributed log replay is incompatible for rolling restarts
Date Tue, 27 May 2014 21:34:06 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14010308#comment-14010308
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Jeffrey Zhong commented on HBASE-11094:
---------------------------------------

Since there are still two/three months away from 1.0 being cut, I'd suggest I can commit this
patch and close the JIRA. Open a new one to set distributedLogReplay off by default and wait
till we're about to cut 1.0 with a clear way on what will be included in 1.0 and rolling upgrading
strategy by then.

> Distributed log replay is incompatible for rolling restarts
> -----------------------------------------------------------
>
>                 Key: HBASE-11094
>                 URL: https://issues.apache.org/jira/browse/HBASE-11094
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Enis Soztutar
>            Assignee: Jeffrey Zhong
>            Priority: Blocker
>             Fix For: 0.99.0
>
>         Attachments: hbase-11094-v2.patch, hbase-11094-v3.patch, hbase-11094.patch
>
>
> 0.99.0 comes with dist log replay by default (HBASE-10888). However, reading the code
and discussing this with Jeffrey, we realized that the dist log replay code is not compatible
with rolling upgrades from 0.98.0 and 1.0.0.
> The issue is that, the region server looks at it own configuration to decide whether
the region should be opened in replay mode or not. The open region RPC does not contain that
info. So if dist log replay is enabled on master, the master will assign the region and schedule
replay tasks. If the region is opened in a RS that does not have this conf enabled, then it
will happily open the region in normal mode (not replay mode) causing possible (transient)
data loss. 



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