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https://issues.apache.org/jira/browse/HBASE-21421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16675028#comment-16675028
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Allan Yang commented on HBASE-21421:
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Will fix the checkstyle on commit, can I have a +1 for this, [~stack] or
[~Apache9]?
> Do not kill RS if reportOnlineRegions fails
> -------------------------------------------
>
> Key: HBASE-21421
> URL: https://issues.apache.org/jira/browse/HBASE-21421
> Project: HBase
> Issue Type: Sub-task
> Affects Versions: 2.1.1, 2.0.2
> Reporter: Allan Yang
> Assignee: Allan Yang
> Priority: Major
> Attachments: HBASE-21421.branch-2.0.001.patch,
> HBASE-21421.branch-2.0.002.patch
>
>
> In the periodic regionServerReport from RS to master, we will call
> master.getAssignmentManager().reportOnlineRegions() to make sure the RS has a
> same state with Master. If RS holds a region which master think should be on
> another RS, the Master will kill the RS.
> But, the regionServerReport could be lagging(due to network or something),
> which can't represent the current state of RegionServer. Besides, we will
> call reportRegionStateTransition and try forever until it successfully
> reported to master when online a region. We can count on
> reportRegionStateTransition calls.
> I have encountered cases that the regions are closed on the RS and
> reportRegionStateTransition to master successfully. But later, a lagging
> regionServerReport tells the master the region is online on the RS(Which is
> not at the moment, this call may generated some time ago and delayed by
> network somehow), the the master think the region should be on another RS,
> and kill the RS, which should not be.
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