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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10125) no need to process RPC request if the client connection has been dropped
Date Sat, 23 Nov 2013 01:24:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13830493#comment-13830493

Hadoop QA commented on HADOOP-10125:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

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

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-common-project/hadoop-common.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/3311//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/3311//console

This message is automatically generated.

> no need to process RPC request if the client connection has been dropped
> ------------------------------------------------------------------------
>                 Key: HADOOP-10125
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10125
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Ming Ma
>         Attachments: hadoop_10125_trunk.patch
> If the client has dropped the connection before the RPC is processed, RPC server doesn't
need to process the RPC call. We have encountered issues where bad applications can bring
down the NN. https://issues.apache.org/jira/i#browse/Hadoop-9640 tries to address that. When
this occurs, NN's RPC queues are filled up with client requests and DN requests, sometimes
we want to stop the flooding by stopping the bad applications and/or DNs. Some RPC processing
like DatanodeProtocol::blockReport could take couple hundred milliseconds. So it is worthwhile
to have NN skip the RPC calls if DNs have been stopped.

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