[HIVE-15503] LLAP: Fix use of Runtime.getRuntime.maxMemory in Hive operators

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.2.0
• Fix Version/s: 2.2.0
• Target Version/s: 2.2.0
• Assignee: Prasanth Jayachandran
• Reporter: Prasanth Jayachandran
• Created: 23/Dec/16 01:26
• Updated: 26/Jul/17 00:02
• Resolved: 24/Dec/16 10:40

Description

ql/src/java/org/apache/hadoop/hive/ql/exec/GroupByOperator.java:    maxHashTblMemory = (long) (memoryPercentage * Runtime.getRuntime().maxMemory());
ql/src/java/org/apache/hadoop/hive/ql/exec/TopNHash.java:    // Total Free Memory = maxMemory() - Used Memory;
ql/src/java/org/apache/hadoop/hive/ql/exec/TopNHash.java:    long totalFreeMemory = Runtime.getRuntime().maxMemory() -

This will not work very well with LLAP because of the memory sharing by executors.