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Posted to common-user@hadoop.apache.org by Ashish Venugopal <ar...@andrew.cmu.edu> on 2008/06/30 20:47:27 UTC

problem when many map tasks are used (since 0.17.1 was installed)

The crash below occurs when I run many ( -jobconf mapred.map.tasks=200)
mappers. It does not occur if I set mapred.map.task=1 even when I allocated
many machines (causing there to be many mappers). But when I set
number of map.tasks to 200

the error below happens. This just started happening after the recent
upgrade to 0.17.1

(previously was using 0.16.4). This is a streaming job. Any help is appreciated.


Ashish

Exception closing file
/user/ashishv/iwslt/syn_baseline/translation_dev/_temporary/_task_200806272233_0001_m_000174_0/part-00174
org.apache.hadoop.ipc.RemoteException: java.io.IOException: Could not complete
write to file /user/ashishv/iwslt/syn_baseline/translation_dev/_tem
porary/_task_200806272233_0001_m_000174_0/part-00174 by
DFSClient_task_200806272233_0001_m_000174_0
        at org.apache.hadoop.dfs.NameNode.complete(NameNode.java:332)
        at sun.reflect.GeneratedMethodAccessor15.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:446)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:896)

        at org.apache.hadoop.ipc.Client.call(Client.java:557)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:212)
        at org.apache.hadoop.dfs.$Proxy1.complete(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.$Proxy1.complete(Unknown Source)
        at
org.apache.hadoop.dfs.DFSClient$DFSOutputStream.closeInternal(DFSClient.java:2655)
        at
org.apache.hadoop.dfs.DFSClient$DFSOutputStream.close(DFSClient.java:2576)
        at org.apache.hadoop.dfs.DFSClient.close(DFSClient.java:221)