Gopal V created HIVE-20951:
------------------------------
Summary: LLAP: Set Xms to 50% always
Key: HIVE-20951
URL: https://issues.apache.org/jira/browse/HIVE-20951
Project: Hive
Issue Type: Bug
Components: llap
Affects Versions: 3.1.1, 4.0.0
Reporter: Gopal V
The lack of GC pauses is killing LLAP containers whenever the significant
amount of memory is consumed by the off-heap structures which aren't cleaned up
automatically until the GC runs.
There's a java.nio.DirectByteBuffer.Deallocator which runs when the Direct
buffers are garbage collected, which actually does the cleanup of the
underlying off-heap buffers.
The lack of Garbage collection activity for several hours while responding to
queries triggers a build-up of these off-heap structures which end up forcing
YARN to kill the process instead.
It is better to hit a GC pause occasionally rather than to lose a node every
few hours.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
