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https://issues.apache.org/jira/browse/HBASE-14059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14631524#comment-14631524
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Esteban Gutierrez commented on HBASE-14059:
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I don't think thats a good idea because even if we have this blacklisted
region, other regions served by this RS might not be available too. The safe
side should be to add the RS to the list of dead servers, one way could be to
extend the Canary to remove the ephemeral znode for this RS to trigger the
recovery of the regions. We could make the threshold configurable (e.g. time
based, # of failed admin ops, etc.) or we we could do this from the master in a
much more coordinated way.
> We should add a RS to the dead servers list if admin calls fail more than a
> threshold
> -------------------------------------------------------------------------------------
>
> Key: HBASE-14059
> URL: https://issues.apache.org/jira/browse/HBASE-14059
> Project: HBase
> Issue Type: Bug
> Components: master, regionserver, rpc
> Affects Versions: 0.98.13
> Reporter: Esteban Gutierrez
> Assignee: Esteban Gutierrez
> Priority: Critical
>
> I ran into this problem twice this week: calls from the HBase master to a RS
> can timeout since the RS call queue size has been maxed out, however since
> the RS is not dead (ephemeral znode still present) the master keeps
> attempting to perform admin tasks like trying to open or close a region but
> those operations eventually fail after we run out of retries or the
> assignment manager attempts to re-assign to other RSs. From the side effects
> of this I've noticed master operations to be fully blocked or RITs since we
> cannot close the region and open the region in a new location since RS is not
> dead.
> A potential solution for this is to add the RS to the list of dead RSs after
> certain number of calls from the master to the RS fail.
> I've noticed only the problem in 0.98.x but it should be present in all
> versions.
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