ReduceTask should handle rpc timeout exception for getting recordWriter
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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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