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From "Nicolas Liochon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8777) HBase client should determine the destination server after retry time
Date Thu, 20 Jun 2013 23:13:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13689819#comment-13689819
] 

Nicolas Liochon commented on HBASE-8777:
----------------------------------------

It's actually implemented this way in 6295.


                
> HBase client should determine the destination server after retry time
> ---------------------------------------------------------------------
>
>                 Key: HBASE-8777
>                 URL: https://issues.apache.org/jira/browse/HBASE-8777
>             Project: HBase
>          Issue Type: Improvement
>          Components: Client
>            Reporter: Sergey Shelukhin
>
> HBase currently determines which server to go to, then creates delayed callable with
pre-determined server and goes there. For later 16-32-... second retries this approach is
suboptimal, the cluster could have seen massive changes in the meantime, so retry might be
completely useless.
> We should re-locate regions after the delay, at least for longer retries. Given how grouping
is currently done it would be a bit of a refactoring.
> The effect of this is alleviated (to a degree) on trunk by server-based retries (if we
fail going to the pre-delay server after delay and then determine the server has changed,
we will go to the new server immediately, so we only lose the failed round-trip time); on
94, if the region is opened on some other server during the delay, we'd go to the old one,
fail, then find out it's on different server, wait a bunch more time because it's a late-stage
retry and THEN go to the new one, as far as I see. 

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