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https://issues.apache.org/jira/browse/HBASE-5924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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nkeywal updated HBASE-5924:
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Status: Patch Available (was: Open)
> 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.v11.patch, 5924.v14.patch, 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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