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https://issues.apache.org/jira/browse/HADOOP-6498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12804679#action_12804679
 ] 

Hadoop QA commented on HADOOP-6498:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12431330/hangClient.patch
  against trunk revision 902745.

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

    +1 tests included.  The patch appears to include 3 new or modified tests.

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

    -1 javac.  The applied patch generated 1032 javac compiler warnings (more 
than the trunk's current 1031 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/290/testReport/
Findbugs warnings: 
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/290/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: 
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/290/artifact/trunk/build/test/checkstyle-errors.html
Console output: 
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-h4.grid.sp2.yahoo.net/290/console

This message is automatically generated.

> IPC client  bug may cause rpc call hang
> ---------------------------------------
>
>                 Key: HADOOP-6498
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6498
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 0.18.3, 0.19.0, 0.19.1, 0.19.2, 0.20.0, 0.20.1
>            Reporter: Ruyue Ma
>            Assignee: Ruyue Ma
>            Priority: Blocker
>             Fix For: 0.20.2, 0.21.0
>
>         Attachments: hadoop-6498-branch-0.20, hadoop-6498.patch, 
> hangClient.patch
>
>
> I can reproduce some rpc call  hang bug when connection thread of ipc client 
> receives response for outstanding call. 
> The stacks when hang occurs (TaskTracker):
>   Waiting on org.apache.hadoop.ipc.client$c...@1c3cbb4b
>   Stack:
>     java.lang.Object.wait(Native Method)
>     java.lang.Object.wait(Object.java:485)
>     org.apache.hadoop.ipc.Client.call(Client.java:691)
>     org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216)
>     org.apache.hadoop.mapred.$Proxy4.heartbeat(Unknown Source)
>     
> org.apache.hadoop.mapred.TaskTracker.transmitHeartBeat(TaskTracker.java:1250)
>     org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:1082)
>     org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:1785)
>     org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:2796)

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