[jira] [Created] (HIVE-21400) Vectorization: LazyBinarySerializeWrite allocates Field() within the loop

[Gopal V (JIRA)]

Gopal V created HIVE-21400:
------------------------------

             Summary: Vectorization: LazyBinarySerializeWrite allocates Field() 
within the loop
                 Key: HIVE-21400
                 URL: https://issues.apache.org/jira/browse/HIVE-21400
             Project: Hive
          Issue Type: Bug
          Components: Vectorization
    Affects Versions: 4.0.0
            Reporter: Gopal V


GC thrash from an unexpected source in ReduceSinkOperator.

{code}
org.apache.hadoop.hive.serde2.lazybinary.fast.LazyBinarySerializeWrite.resetWithoutOutput(LazyBinarySerializeWrite.java:136)
        at 
org.apache.hadoop.hive.serde2.lazybinary.fast.LazyBinarySerializeWrite.reset(LazyBinarySerializeWrite.java:132)
        at 
org.apache.hadoop.hive.ql.exec.vector.reducesink.VectorReduceSinkUniformHashOperator.process(VectorReduceSinkUniformHashOperator.java:180)
{code}

GC space is getting thrashed by the 

{code}
    root = new Field(STRUCT);
{code}

for every row.



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