[MAPREDUCE-144] TaskMemoryManager should log process-tree's status while killing tasks. - ASF JIRA

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Modified TaskMemoryManager so that it logs a map/reduce task's process-tree's status just before it is killed when it grows out of its configured memory limits. The log dump is in the format " |- PID PPID PGRPID SESSID CMD_NAME VMEM_USAGE(BYTES) FULL_CMD_LINE".

This is useful for debugging the cause for a map/reduce task and it's corresponding process-tree to be killed by the TaskMemoryManager.

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Modified TaskMemoryManager so that it logs a map/reduce task's process-tree's status just before it is killed when it grows out of its configured memory limits. The log dump is in the format " |- PID PPID PGRPID SESSID CMD_NAME VMEM_USAGE(BYTES) FULL_CMD_LINE". This is useful for debugging the cause for a map/reduce task and it's corresponding process-tree to be killed by the TaskMemoryManager.

This helps a lot in debugging why a particular task has gone beyond memory limits.

is blocked by

HADOOP-6230 Move process tree, and memory calculator classes out of Common into Map/Reduce.