[HADOOP-1657] NNBench benchmark hangs with trunk

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.14.0
• Fix Version/s: 0.14.0
• Assignee: Raghu Angadi
• Reporter: Raghu Angadi
• Created: 27/Jul/07 03:19
• Updated: 08/Jul/09 16:42
• Resolved: 01/Aug/07 22:24

Description

NNBench runs with a small block size (say 20). But uses default value of 512 for io.bytes.per.checksum. Since HADOOP-1134, block size should be a multiple of of bytes.per.checksum. Fix is to set bytes.per.checksum to same as blocksize.

I think following changes to NNBench would help in general (at least the first one) :

• NNBench does not log these exceptions. I think it should.
• It calls create() in an infinite loop as long as create does not succeed. May be we should have an upper limit. Say, max 10000.