Our fetchers are parsing and we sometimes see the parsers stall and eventually 
hang. This happens consistently during some mappers. When they are restarted 
by Hadoop they're guaranteed to stall at roughly the same point, the parsers 
start to timeout first and then the fetcher refuses to print its usual 

I did some stack traces and all threads are blocked and most involve the 
parser. I can't seem to understand the issue here so any pointers are much 
appreciated. We have a useless cluster right now :)


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