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https://issues.apache.org/jira/browse/HBASE-6227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13393672#comment-13393672
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chunhui shen commented on HBASE-6227:
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@ram
bq.I think if the ROOT and META are assigned to a new RS then in
assignRootAndMeta it should split the log right?
Yes, it's right, but how about two regionservers, how about all the
regionservers died and restarted between assignRootAndMeta and
rebuildUserRegions, both will cause the case:
Master consider it as a cluster startup and SSH is processing.
> SSH and cluster startup causes data loss
> -----------------------------------------
>
> Key: HBASE-6227
> URL: https://issues.apache.org/jira/browse/HBASE-6227
> Project: HBase
> Issue Type: Bug
> Components: master
> Reporter: chunhui shen
> Assignee: chunhui shen
> Attachments: HBASE-6227.patch
>
>
> In AssignmentManager#processDeadServersAndRegionsInTransition, if
> servershutdownhandler is processing and master consider it cluster startup,
> master will assign all user regions, however, servershutdownhandler has not
> completed splitting logs.
> Detail process as the following( 1 master, 1 regionserver):
> 1.All the servers are killed
> 2.master start up, regionserver's zk node exists, so master will record it
> 3.master won't split any logs
> 4.regionserver start up, and master assign root and meta
> 5.the old regionserver is in SSH now, when rebuild user region, no region is
> added in master's region list
> 6.master consider it is cluster up, so it will assign all user regions
> 7.However, some region's data is in logs which are splittting by SSH
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