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https://issues.apache.org/jira/browse/HBASE-4237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13088299#comment-13088299
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Benoit Sigoure commented on HBASE-4237:
---------------------------------------

Patch @ 
https://github.com/tsuna/hbase/commit/1f602391ee4cd3d11eaf3067208caeadf214b3a8

> Directly remove the call being handled from the map of outstanding RPCs
> -----------------------------------------------------------------------
>
>                 Key: HBASE-4237
>                 URL: https://issues.apache.org/jira/browse/HBASE-4237
>             Project: HBase
>          Issue Type: Improvement
>          Components: ipc
>    Affects Versions: 0.90.4
>            Reporter: Benoit Sigoure
>            Assignee: Benoit Sigoure
>            Priority: Minor
>
> The client has to maintain a map of RPC ID to `Call' object for this RPC, for 
> every outstanding RPC.  When receiving a response, the client was getting the 
> `Call' out of the map (one O(log n) operation) and then removing it from the 
> map (another O(log n) operation).  There is no benefit in not removing it 
> directly from the map.

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