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https://issues.apache.org/jira/browse/HBASE-2417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854825#action_12854825
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Jean-Daniel Cryans commented on HBASE-2417:
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Yeah took me a while too. So basically if there's a normal exception like NSRE
then it will return null (that I catch). HCM could use some refactoring love.
> HCM.locateRootRegion fails hard on "Connection refused"
> -------------------------------------------------------
>
> Key: HBASE-2417
> URL: https://issues.apache.org/jira/browse/HBASE-2417
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.20.3
> Reporter: Jean-Daniel Cryans
> Assignee: Jean-Daniel Cryans
> Fix For: 0.20.4, 0.21.0
>
> Attachments: HBASE-2417.patch
>
>
> While running some tests on replication, I saw that our client does something
> dumb if it tries to contact a dead region server that held the ROOT region in
> HCM.locateRootRegion. Will post stack trace in a comment.
> The problem here is that we don't retry at all, the exception will come
> straight out of HCM like it's the end of the world.
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