[HADOOP-1154] streaming hang. (PipeMapRed$MROutputThread gone)

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.13.0
• Assignee: Koji Noguchi
• Reporter: Koji Noguchi
• Created: 23/Mar/07 21:32
• Updated: 08/Jul/09 17:05
• Resolved: 17/Apr/07 12:19

Description

One streaming reducer ('cat') hang,

'/bin/cat' reducer waiting in
0 S _____ 24587 24557 0 75 0 - 631 pipe_w Mar22 ? 00:00:02 /bin/cat

strace showed that it's waiting in write.
$ strace -p 24587
Process 24587 attached - interrupt to quit
write(1, "________ "..., 138 <unfinished ...>
Process 24587 detached

When I looked at the jstack of ReduceTask process, I couldn't find the PipeMapRed$MROutputThread.