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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11094) Distributed log replay is incompatible for rolling restarts
Date Tue, 27 May 2014 19:39:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14010180#comment-14010180
] 

stack commented on HBASE-11094:
-------------------------------

I took a quick looks.  Seems good to me.

How to proceed?  Commit this with fat release note and a note in the 1.0 doc that we need
to include in the upgrade doc the steps this issues requires rolling upgrading and then discuss
on dev in 1.0 thread if we should turn off distributed log replay for 1.0?

> 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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