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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11094) Distributed log replay is incompatible for rolling restarts
Date Tue, 03 Jun 2014 01:58:02 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11094?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jeffrey Zhong updated HBASE-11094:
----------------------------------

    Attachment: hbase-11094-v4.patch

Thanks [~enis] for the review! The v4 patch covers Enis comments. Basically, we only keep
log splitting/replay config setting in master(splitlogmanager) and region server will use
what's told by master.

When log recovery mode config setting is changed and restart master, master will delay its
recovery mode update till all outstanding log split tasks drained in order to avoid asking
people manually check the drain status(basically no release note for the JIRA) 

Thanks

> 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.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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