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All, I have a small gluster filesystem on 3 nodes. I have a perl program that multi-threads and each thread writes it’s output to one of 3 files depending on some results. My trouble is that I am seeing missing lines from the output. The input is a file of 500 lines. Depending on the line, it would be written to one of three files, but when I total the lines put out, I am missing anywhere from 4 to 8 lines. This is even the case if I use an input file that should all go to a single file. BUT… when I have it write to /tmp or /dev/shm, all of the lines expected are there. This leads me to think there is something not happy with gluster and concurrent writes. Here is the code for the actual write: flock(GOOD_FILES, LOCK_EX) or die $!; seek(GOOD_FILES, 0, SEEK_END) or die $!; print GOOD_FILES $lines_to_process[$tid-1] ."\n"; flock(GOOD_FILES, LOCK_UN) or die $!; So I would expect the proper file locking is taking place. Is it possible that gluster is not writing because of a race condition? Any insight as to where to look for a solution is appreciated. Brian Andrus |
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