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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11094) Distributed log replay is incompatible for rolling restarts
Date Fri, 23 May 2014 22:58:03 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14007835#comment-14007835
] 

Enis Soztutar commented on HBASE-11094:
---------------------------------------

After some offline discussions with Jeffrey, it seems that we do not want to add a lot of
complexity for dealing with this incapability. Should we disable the feature by default again,
commit this patch, and re-enable it post 1.0? If we commit something like the attached patch,
it would mean rolling restarts from 1.0 to 1.1 (if it enables by default) will not be broken,
but 0.98 -> 1.1 will be. [~saint.ack@gmail.com] wdyt? 

> 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.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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