Gopal V created HIVE-20321:
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Summary: Vectorization: Cut down memory size of 1 col
VectorHashKeyWrapper to <1 CacheLine
Key: HIVE-20321
URL: https://issues.apache.org/jira/browse/HIVE-20321
Project: Hive
Issue Type: Bug
Reporter: Gopal V
With a full sized LLAP instance, the memory size of the VectorHashKeyWrapper is
bigger than the low Xmx JVMs.
{code}
***** 64-bit VM: **********************************************************
org.apache.hadoop.hive.ql.exec.vector.VectorHashKeyWrapper object internals:
OFFSET SIZE
TYPE DESCRIPTION VALUE
0 16
(object header) N/A
16 4
int VectorHashKeyWrapper.hashcode N/A
20 4
(alignment/padding gap)
24 8
long[] VectorHashKeyWrapper.longValues N/A
32 8
double[] VectorHashKeyWrapper.doubleValues N/A
40 8
byte[][] VectorHashKeyWrapper.byteValues N/A
48 8
int[] VectorHashKeyWrapper.byteStarts N/A
56 8
int[] VectorHashKeyWrapper.byteLengths N/A
64 8
org.apache.hadoop.hive.serde2.io.HiveDecimalWritable[]
VectorHashKeyWrapper.decimalValues N/A
72 8
java.sql.Timestamp[] VectorHashKeyWrapper.timestampValues N/A
80 8
org.apache.hadoop.hive.common.type.HiveIntervalDayTime[]
VectorHashKeyWrapper.intervalDayTimeValues N/A
88 8
boolean[] VectorHashKeyWrapper.isNull N/A
96 8
org.apache.hadoop.hive.ql.exec.vector.VectorHashKeyWrapper.HashContext
VectorHashKeyWrapper.hashCtx N/A
Instance size: 104 bytes
Space losses: 4 bytes internal + 0 bytes external = 4 bytes total
{code}
Pulling this up to a parent class allows for this to be cut down to 32 bytes
for the single column case.
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