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From bharath v <bharathvissapragada1...@gmail.com>
Subject map 0% reduce 0%
Date Wed, 10 Mar 2010 18:31:49 GMT
Hi ,

I've configured a cloud of 7 nodes . "hadoop dfsadmin -report" is
showing the correct status.
I tried running WordCount.jar  It is stucking @  map 0% and reduce 0%
. I saw something weird in
the end of Tasktracker log in the namenode . It is showing OutOfMemory
. Should I increase the heap space or what . ?
Kindly help

Exception in thread "IPC Client (47) connection to
megh03/10.2.4.175:19001 from hdev" java.lang.OutOfMemoryError: GC
overhead limit exceeded
        at sun.nio.ch.EPollSelectorImpl.implRegister(EPollSelectorImpl.java:143)
        at sun.nio.ch.SelectorImpl.register(SelectorImpl.java:115)
        at java.nio.channels.spi.AbstractSelectableChannel.register(AbstractSelectableChannel.java:180)
        at java.nio.channels.SelectableChannel.register(SelectableChannel.java:254)
        at org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(SocketIOWithTimeout.java:331)
        at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:157)
        at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:155)
        at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:128)
        at java.io.FilterInputStream.read(FilterInputStream.java:116)
        at org.apache.hadoop.ipc.Client$Connection$PingInputStream.read(Client.java:276)
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
        at java.io.DataInputStream.readInt(DataInputStream.java:370)
        at org.apache.hadoop.ipc.Client$Connection.receiveResponse(Client.java:501)
        at org.apache.hadoop.ipc.Client$Connection.run(Client.java:446)

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