Prasanth Jayachandran created HIVE-15503:
--------------------------------------------

             Summary: LLAP: Fix use of Runtime.getRuntime.maxMemory in Hive 
operators
                 Key: HIVE-15503
                 URL: https://issues.apache.org/jira/browse/HIVE-15503
             Project: Hive
          Issue Type: Bug
    Affects Versions: 2.2.0
            Reporter: Prasanth Jayachandran
            Assignee: Prasanth Jayachandran
            Priority: Critical


{code}
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() -
{code}

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



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