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https://issues.apache.org/jira/browse/HADOOP-5760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12802638#action_12802638
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Ruyue Ma commented on HADOOP-5760:
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could we make  this issue as a duplicate of hadoop-6498?

> Task process hanging on an RPC call
> -----------------------------------
>
>                 Key: HADOOP-5760
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5760
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>            Reporter: Devaraj Das
>
> On a random node on a cluster, I found one task process waiting on an RPC 
> call. The process has been in that state for a few days at least.
> "main" prio=10 tid=0x08069400 nid=0x6f52 in Object.wait() 
> [0xf7e6c000..0xf7e6d1f8]
>    java.lang.Thread.State: WAITING (on object monitor)
>         at java.lang.Object.wait(Native Method)
>         - waiting on <0xf1215700> (a org.apache.hadoop.ipc.Client$Call)
>         at java.lang.Object.wait(Object.java:485)
>         at org.apache.hadoop.ipc.Client.call(Client.java:725)
>         - locked <0xf1215700> (a org.apache.hadoop.ipc.Client$Call)
>         at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220)
>         at org.apache.hadoop.mapred.$Proxy0.statusUpdate(Unknown Source)
>         at org.apache.hadoop.mapred.Task.statusUpdate(Task.java:691)
>         at org.apache.hadoop.mapred.Task.taskCleanup(Task.java:795)
>         at org.apache.hadoop.mapred.Child.main(Child.java:176)

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