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https://issues.apache.org/jira/browse/HADOOP-3198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12609701#action_12609701
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Runping Qi commented on HADOOP-3198:
------------------------------------
I saw a jos, 13% of its reducers were failed due to this rpc timeout problem.
That is seriously flawed.
> ReduceTask should handle rpc timeout exception for getting recordWriter
> -----------------------------------------------------------------------
>
> Key: HADOOP-3198
> URL: https://issues.apache.org/jira/browse/HADOOP-3198
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Runping Qi
> Attachments: patch-3198.txt
>
>
> After shuffling and sorting, the reduce task is ready for the final phase ---
> reduce.
> The first thing is to create a record writer.
> That call may fail due to rpc timeout.
> java.net.SocketTimeoutException: timed out waiting for rpc response
> at org.apache.hadoop.ipc.Client.call(Client.java:559)
> at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:212)
> at org.apache.hadoop.dfs.$Proxy1.getFileInfo(Unknown Source)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
>
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
>
> at org.apache.hadoop.dfs.$Proxy1.getFileInfo(Unknown Source)
> at org.apache.hadoop.dfs.DFSClient.getFileInfo(DFSClient.java:548)
> at
> org.apache.hadoop.dfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:380)
>
> at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:598)
> at
> org.apache.hadoop.mapred.TextOutputFormat.getRecordWriter(TextOutputFormat.java:106)
>
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:366)
> at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2126)
> Then the whole reduce task failed, and all the work of shuflling and sorting
> is gone!
> The reduce task should handle this case better. It is worthwile to try a few
> times before it gives up.
> The stake is too high to give up at the first try.
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