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https://issues.apache.org/jira/browse/HBASE-21480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16690388#comment-16690388
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Allan Yang commented on HBASE-21480:
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The UT also fails in branch-2.0 and branch-2.1. It is very strange, snapshot
also randomly executed during ITBILL, but I never encountered this case.
> Taking snapshot when RS crashes prevent we bring the regions online
> -------------------------------------------------------------------
>
> Key: HBASE-21480
> URL: https://issues.apache.org/jira/browse/HBASE-21480
> Project: HBase
> Issue Type: Improvement
> Components: snapshots
> Reporter: Duo Zhang
> Assignee: Duo Zhang
> Priority: Major
> Fix For: 3.0.0, 2.2.0
>
> Attachments: HBASE-21480-UT-v1.patch, HBASE-21480-UT.patch,
> HBASE-21480.patch
>
>
> The current implementation is not good enough. It will take the exclusive
> lock all the time which could hurt the availability, as we need to hold the
> shared lock when assigning regions.
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