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https://issues.apache.org/jira/browse/HBASE-11094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14030851#comment-14030851
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stack commented on HBASE-11094:
-------------------------------
bq. Once 1.0 branch is cut, I'll create a JIRA to turn distributedLogReplay off
by default depends on the rolling upgrade story for 1.0.
What does the above mean [~jeffreyz]?
Can you add a release note saying what has been implemented? I know you say
'(basically no release note for the JIRA)' above but would be good for us devs
trying to follow along (or who may have to debug it in future). Please
describe what was implemented
To be clear, mode is LOG_REPLAY currently in master?
Reading over the patch, it looks good. I'm not sure I am clear on all that is
going on but I like the sound of it (smile).
> 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-v4.patch, hbase-11094-v5.1.patch, hbase-11094-v5.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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