Not sure I am clean on how I can debug stuff on a cluster. I currently have a
long running reducer that attempts to run 4 times before finally giving up
I get 4 of these: Task attempt_201005101345_0052_r_000012_0 failed to report
status for 601 seconds. Killing!
before it gives up...on the last try I noticed this in the log:
ERROR: org.apache.hadoop.hdfs.DFSClient - Exception closing file
/tmp/temp1925356068/tmp1003826561/_temporary/_attempt_201005101345_0052_r_000012_4/abs/tmp/temp1925356068/tmp-197182389/part-00012
: org.apache.hadoop.ipc.RemoteException: java.io.IOException: Could not
complete write to file
/tmp/temp1925356068/tmp1003826561/_temporary/_attempt_201005101345_0052_r_000012_4/abs/tmp/temp1925356068/tmp-197182389/part-00012
by DFSClient_attempt_201005101345_0052_r_000012_4
at
org.apache.hadoop.hdfs.server.namenode.NameNode.complete(NameNode.java:497)
at sun.reflect.GeneratedMethodAccessor23.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$Server.call(RPC.java:508)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:966)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:962)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:960)
How do I turn on log4j's DEBUG statements? Hoping those will help me pinpoint
what is going on here--maybe it's the cluster or maybe the script.
