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https://issues.apache.org/jira/browse/HBASE-21480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16689314#comment-16689314
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Duo Zhang commented on HBASE-21480:
-----------------------------------
OK, the snapshot implementation itself can not deal with rs crashes, it will
hang there forever if there are regions on crashed region servers...
So the new UT just confirm that, the snapshot operation does not prevent we
bring the regions online...
> Taking snapshot when RS crashes may hang
> ----------------------------------------
>
> Key: HBASE-21480
> URL: https://issues.apache.org/jira/browse/HBASE-21480
> Project: HBase
> Issue Type: Improvement
> Components: snapshots
> Reporter: Duo Zhang
> Priority: Major
> Fix For: 3.0.0, 2.2.0
>
> Attachments: HBASE-21480-UT-v1.patch, HBASE-21480-UT.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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