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From Gopal Vijayaraghavan <>
Subject Re: Tez GC issues perhaps? not sure.
Date Wed, 14 Dec 2016 05:50:26 GMT

> well we are seeing these sessions sitting around for over an hour 

This could be one of the causes for this issue - a stuck ATS. Tez won't kill a session till
all the ATS info has been submitted out of the process.

RollingLevelDbTimelineStore & EntityGroupFSTimelineStore was written to fix this issue,
but AFAIK those are not the default in the Apache Hadoop installs (but Ambari does set them

Check your in yarn-site.xml, if it says LeveldbTimelineStore,
you might see this behavior exactly 30 days after the cluster goes operational.


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