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From Benjamin Kim <bbuil...@gmail.com>
Subject Completed Tasks in YARN will not release resources
Date Sat, 30 Apr 2016 12:56:32 GMT
Has anyone encountered this problem with YARN. It all started after an attempt to upgrade from
CDH 5.4.8 to CDH 5.5.2.

I ran jobs overnight, and they never completed. But, it did take down the YARN ResourceManager
and multiple NodeManagers after 5 or 6 hours. There was one job that out of 450 mappers, only
64 completed, 386 pending, and 0 running. The pending mappers are in a Scheduled state.

Each data node has 24 cores, 64 GB, 6 drives x 2 TB. NodeManager is allocated 45GB; Mappers
are allocated 4GB (3.2GB Heap); Reducers are allocated 8GB (6.4GB Heap); AM is allocated 8GB
(6.4 GB Heap).

There was a note for each completed task attempt stating that it was in the finished state
for too long. I believe that the task is not releasing the container when it’s done or is
not communicating it back.

Does anyone have any ideas?


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