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From "Nicolas Spiegelberg (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4785) Improve recovery time of HBase client when a region server dies.
Date Wed, 23 Nov 2011 18:07:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13156011#comment-13156011
] 

Nicolas Spiegelberg commented on HBASE-4785:
--------------------------------------------

@stack : You're correct about the missing entrySet().  There was a previous commit in 89-fb
(r1181942) that I could not find a use for.  I guess it's this feature.
                
> Improve recovery time of HBase client when a region server dies.
> ----------------------------------------------------------------
>
>                 Key: HBASE-4785
>                 URL: https://issues.apache.org/jira/browse/HBASE-4785
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Nicolas Spiegelberg
>            Assignee: Nicolas Spiegelberg
>            Priority: Minor
>             Fix For: 0.94.0
>
>         Attachments: HBASE-4785.patch
>
>
> When a region server dies, the HBase client waits until the RPC timesout before learning
that it needs to check META to find the new location of the region. And it incurs this *timeout*
cost for every region being served by the dead region server. Remove this overhead by clearing
the entries in cache that have the dead region server as their values.

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