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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3198) ReduceTask should handle rpc timeout exception for getting recordWriter
Date Sat, 05 Apr 2008 19:31:26 GMT
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

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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