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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-6498) IPC client bug may cause rpc call hang
Date Tue, 19 Jan 2010 23:28:54 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6498?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hairong Kuang updated HADOOP-6498:
----------------------------------

         Priority: Blocker  (was: Critical)
    Fix Version/s: 0.20.2

Good catch, Ruyue! It would be nice that we get it fixed in 0.20 as well. Could you please
post a patch for 0.20? I know that it is hard. Is it possible to write a unit test to reproduce
the bug?

> 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.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$Call@1c3cbb4b
>   Stack:
>     java.lang.Object.wait(Native Method)
>     java.lang.Object.wait(Object.java:485)
>     org.apache.hadoop.ipc.Client.call(Client.java:691)
>     org.apache.hadoop.ipc.RPC$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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