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https://issues.apache.org/jira/browse/HBASE-7506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13547056#comment-13547056
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Jimmy Xiang commented on HBASE-7506:
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The only reason we have MetaServerShutdownHandler is because of the event type:
EventType.M_META_SERVER_SHUTDOWN. ServerShutdownHandler already has an event
type member variable.
If isCarryingRoot/isCarryingMeta is useful, it makes sense to have
MetaServerShutdownHandler. Now since they are not used any more, why do we
still need this class?
bq. ROOT won't be in RIT, because we offline it
Make sense. That means we should not verify any more, right?
> Judgment of carrying ROOT/META will become wrong when expiring server
> ---------------------------------------------------------------------
>
> Key: HBASE-7506
> URL: https://issues.apache.org/jira/browse/HBASE-7506
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.94.3
> Reporter: chunhui shen
> Assignee: chunhui shen
> Fix For: 0.96.0
>
> Attachments: 7506-trunk v1.patch
>
>
> We will check whether server carrying ROOT/META when expiring the server.
> See ServerManager#expireServer.
> If the dead server carrying META, we assign meta directly in the process of
> ServerShutdownHandler.
> If the dead server carrying ROOT, we will offline ROOT and then
> verifyAndAssignRootWithRetries()
> How judgement of carrtying ROOT/META become wrong?
> If region is in RIT, and isCarryingRegion() return true after addressing from
> zk.
> However, once RIT time out(could be caused by this.allRegionServersOffline &&
> !noRSAvailable, see AssignmentManager#TimeoutMonitor) and we assign it to
> otherwhere, this judgement become wrong.
> See AssignmentManager#isCarryingRegion for details
> With the wrong judgement of carrtying ROOT/META, we would assign ROOT/META
> twice.
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