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From "Esteban Gutierrez (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14059) We should add a RS to the dead servers list if admin calls fail more than a threshold
Date Fri, 17 Jul 2015 16:18:04 GMT

    [ 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:
-------------------------------------------

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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