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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1849) IPC server max queue size should be configurable
Date Wed, 24 Feb 2010 23:29:28 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12838086#action_12838086
] 

Hadoop QA commented on HADOOP-1849:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12436898/handlerQueueSizeConfig.patch
  against trunk revision 915168.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/380/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/380/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/380/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/380/console

This message is automatically generated.

> IPC server max queue size should be configurable
> ------------------------------------------------
>
>                 Key: HADOOP-1849
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1849
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc
>            Reporter: Raghu Angadi
>            Assignee: Konstantin Shvachko
>         Attachments: handlerQueueSizeConfig.patch, handlerQueueSizeConfig.patch, handlerQueueSizeConfig.patch
>
>
> Currently max queue size for IPC server is set to (100 * handlers). Usually when RPC
failures are observed (e.g. HADOOP-1763), we increase number of handlers and the problem goes
away. I think a big part of such a fix is increase in max queue size. I think we should make
maxQsize per handler configurable (with a bigger default than 100). There are other improvements
also (HADOOP-1841).
> Server keeps reading RPC requests from clients. When the number in-flight RPCs is larger
than maxQsize, the earliest RPCs are deleted. This is the main feedback Server has for the
client. I have often heard from users that Hadoop doesn't handle bursty traffic.
> Say handler count is 10 (default) and Server can handle 1000 RPCs a sec (quite conservative/low
for a typical server), it implies that an RPC can wait for only for 1 sec before it is dropped.
If there 3000 clients and all of them send RPCs around the same time (not very rare, with
heartbeats etc), 2000 will be dropped. In stead of dropping the earliest RPCs, if the server
delays reading new RPCs, the feedback to clients would be much smoother, I will file another
jira regd queue management.
> For this jira I propose to make queue size per handler configurable, with a larger default
(may be 500).

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