[jira] Updated: (HADOOP-1841) IPC server should write repsonses asynchronously

["dhruba borthakur (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-1841?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

dhruba borthakur updated HADOOP-1841:
-------------------------------------

    Attachment: asyncRPC-4.patch

This patch is in response to Doug's comments that we need to show improvement in performance in the face of slow clients.

This patch has a unit test that creates a server with one handler thread. One thread makes an RPC and stops processing the response. Another thread then issues another RPC and it completes successfully even though the first thread has not yet consumed the RPC response. This test passes successfully with this patch whereas it fails with trunk.

Please let me know is it addresses your concerns. If so, then the only remaining thing to make this patch committable is to demonstrate that it does not degrade performance for sort runs.

> IPC server should write repsonses asynchronously
> ------------------------------------------------
>
>                 Key: HADOOP-1841
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1841
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: ipc
>            Reporter: Doug Cutting
>            Assignee: dhruba borthakur
>         Attachments: asyncRPC-2.patch, asyncRPC-4.patch, asyncRPC.patch, asyncRPC.patch
>
>
> Hadoop's IPC Server currently writes responses from request handler threads using blocking writes.  Performance and scalability might be improved if responses were written asynchronously.

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