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https://issues.apache.org/jira/browse/HBASE-11094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13994083#comment-13994083
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Jeffrey Zhong commented on HBASE-11094:
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{quote}
-1 lineLengths. The patch introduces the following lines longer than 100:
{quote}
Those lines are generated by PB not "my code".
> 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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