Minor Description
Currently if the generate job fails the following happens:
1. generate temp directory remains
2. crawldb remains in lock
The next time generate is called the following happens:
IO exception due to crawldb being in lock mode
Attached is a patch that cleans up after a job fails in generate by unlocking crawldb and removing the generate temp directory so that if a job fails the next time generate is called it wouldn't give an IO Exception.