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Posted to issues@hbase.apache.org by "Nicolas Liochon (JIRA)" <ji...@apache.org> on 2013/06/21 01:13:20 UTC
[jira] [Commented] (HBASE-8777) HBase client should determine the
destination server after retry time
[ 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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