Every time the mapping phase finishes I see this

[Mayuran Yogarajah]

There are always a few 'Failed/Killed Task Attempts' and when I view the 
logs for
these I see:

- some that are empty, ie stdout/stderr/syslog logs are all blank
- several that say:
2009-06-06 20:47:15,309 WARN org.apache.hadoop.mapred.TaskTracker: Error 
running child
java.io.IOException: Filesystem closed
        at org.apache.hadoop.dfs.DFSClient.checkOpen(DFSClient.java:195)
        at org.apache.hadoop.dfs.DFSClient.access$600(DFSClient.java:59)
        at 
org.apache.hadoop.dfs.DFSClient$DFSInputStream.close(DFSClient.java:1359)
        at java.io.FilterInputStream.close(FilterInputStream.java:159)
        at 
org.apache.hadoop.mapred.LineRecordReader$LineReader.close(LineRecordReader.java:103)
        at 
org.apache.hadoop.mapred.LineRecordReader.close(LineRecordReader.java:301)
        at 
org.apache.hadoop.mapred.MapTask$TrackedRecordReader.close(MapTask.java:173)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:231)
        at 
org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2198)



Any idea why this happens? I don't understand why I'd be seeing these 
only as the mappers get to
100%.

thanks