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https://issues.apache.org/jira/browse/HADOOP-6498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12801845#action_12801845
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Ruyue Ma commented on HADOOP-6498:
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This bug is related to the ipc/Client.java. In receiveResponse() methods, we
first remove the call, then read the data. When reading encouters exception,
the thread waiting the call object will not be waken forever.
> 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: Critical
> Fix For: 0.21.0
>
>
> 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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