How best to debug failed fetch-reduce task

2006-04-12 Thread Shawn Gervais
Greetings list, I am trying to debug why my fetch process is dying on the reduce side - I see a single reduce task out of 16 dying with the following message: Timed out.java.io.IOException: Task process exit with nonzero status. at org.apache.hadoop.mapred.TaskRunner.runChild Which is

Re: How best to debug failed fetch-reduce task

2006-04-12 Thread Doug Cutting
Shawn Gervais wrote: When I have been at the terminal to observe the timed out process before it is reaped, I have seen that it continues to use 100% of a single processor. strace of the java process did not produce any usable leads. When the reduce task is reassigned, either to the same