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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Closed: (ABDERA-141) ReduceTask should handle rpc timeout better when creating record writer
Date Sat, 05 Apr 2008 19:29:24 GMT

     [ https://issues.apache.org/jira/browse/ABDERA-141?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Runping Qi closed ABDERA-141.
-----------------------------

    Resolution: Fixed

wrong project.

sorry.



> ReduceTask should handle rpc timeout better when creating record writer
> -----------------------------------------------------------------------
>
>                 Key: ABDERA-141
>                 URL: https://issues.apache.org/jira/browse/ABDERA-141
>             Project: Abdera
>          Issue Type: Bug
>            Reporter: Runping Qi
>
> 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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