FAQ
I noticed a tasktracker's log file logged many java.io.IOException errors. What does such an error mean or what triggers it and how to use such information?

...
2010-09-20 15:40:00,290 DEBUG org.apache.hadoop.mapred.TaskTracker: Got heartbeatResponse from JobTracker with responseId: 134 and 0 actions
2010-09-20 15:45:28,929 ERROR org.apache.hadoop.mapred.TaskTracker: Caught exception: java.io.IOException: Call to jobtrackerhost/jobtrackerhost:port failed on local
exception: java.io.IOException: Connection reset by peer
at org.apache.hadoop.ipc.Client.wrapException(Client.java:775)
at org.apache.hadoop.ipc.Client.call(Client.java:743)
at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220)
at org.apache.hadoop.mapred.$Proxy4.heartbeat(Unknown Source)
at org.apache.hadoop.mapred.TaskTracker.transmitHeartBeat(TaskTracker.java:1219)
at org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:1041)
at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:1724)
at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:2837)
Caused by: java.io.IOException: Connection reset by peer
at sun.nio.ch.FileDispatcher.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:21)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:237)
at sun.nio.ch.IOUtil.read(IOUtil.java:210)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:236)
at org.apache.hadoop.net.SocketInputStream$Reader.performIO(SocketInputStream.java:55)
at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:142)
at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:155)
at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:128)
at java.io.FilterInputStream.read(FilterInputStream.java:116)
at org.apache.hadoop.ipc.Client$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)

2010-09-20 15:45:28,929 INFO org.apache.hadoop.mapred.TaskTracker: Resending 'status' to 'jobtrackerhost' with reponseId '134
2010-09-20 15:45:28,995 DEBUG org.apache.hadoop.mapred.TaskTracker: Got heartbeatResponse from JobTracker with responseId: 135 and 0 actions
...


Thanks,

Michael

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postedSep 20, '10 at 9:21p
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