Gopal V created AMBARI-17818:
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Summary: Tez & Hive: Memory management should use scaled down Xmx
for sizing buffers
Key: AMBARI-17818
URL: https://issues.apache.org/jira/browse/AMBARI-17818
Project: Ambari
Issue Type: Bug
Reporter: Gopal V
The defaults in Ambari assume 80% of the YARN container size is allocate to the
user heap (Xmx).
On top of this particular restriction, the allocation blocks are divided into
Eden/Survivor/Tenured - a single allocation spanning 40% of the heap might fail
for tez runtime.io.sort.mb.
Scale down the Tez sort size and map join by 0.8x to match Xmx.
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