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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5924) In the client code, don't wait for all the requests to be executed before resubmitting a request in error.
Date Thu, 07 Jun 2012 15:20:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13291069#comment-13291069
] 

stack commented on HBASE-5924:
------------------------------

Upload v10 nkeywal and we'll commit it.  Thanks for responses above.
                
> In the client code, don't wait for all the requests to be executed before resubmitting
a request in error.
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-5924
>                 URL: https://issues.apache.org/jira/browse/HBASE-5924
>             Project: HBase
>          Issue Type: Improvement
>          Components: client
>    Affects Versions: 0.96.0
>            Reporter: nkeywal
>            Assignee: nkeywal
>         Attachments: 5924.v5.patch, 5924.v9.patch
>
>
> The client (in the function HConnectionManager#processBatchCallback) works in two steps:
>  - make the requests
>  - collect the failures and successes and prepare for retry
> It means that when there is an immediate error (region moved, split, dead server, ...)
we still wait for all the initial requests to be executed before submitting again the failed
request. If we have a scenario with all the requests taking 5 seconds we have a final execution
time of: 5 (initial requests) + 1 (wait time) + 5 (final request) = 11s.
> We could improve this by analyzing immediately the results. This would lead us, for the
scenario mentioned above, to 6 seconds. 
> So we could have a performance improvement of nearly 50% in many cases, and much more
than 50% if the request execution time is different.

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