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)