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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11094) Distributed log replay is incompatible for rolling restarts
Date Tue, 27 May 2014 17:24:03 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14009922#comment-14009922
] 

Hadoop QA commented on HBASE-11094:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12646940/hbase-11094-v3.patch
  against trunk revision .
  ATTACHMENT ID: 12646940

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 13 new or modified
tests.

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/9603//console

This message is automatically generated.

> 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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