Mapredtest failure

[Brendan Melville]

I am experimenting with some of the tests in hadoop-0.8.0-test.jar and 
am curious about the possible causes of mapredtest failing.

I make the call as follows:
bin/hadoop jar hadoop-0.8.0-test.jar mapredtest 10 100


The map/reduce tasks compute and the output is as follows:

Cannot read entry 1
Original sum: 100
Recomputed sum: 7
Success=false

Sometimes there will be Mismatches prior to that output.

Any advice would be appreciated.

Thank you.
Brendan Melville.