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unnecessary serialize/deserialize for cases where no conversion was performed #329

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unnecessary serialize/deserialize for cases where no conversion was performed #329

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0b2a7a2
unnecessary serialize/deserialize for cases where no conversion was p…
chiragaggarwal May 6, 2014
7bfc9e6
unnecessary serialize/deserialize for cases where no conversion was p…
chiragaggarwal May 23, 2014
eea72cd
Incorporated the feedback
chiragaggarwal May 29, 2014
6efb4d0
Since partValues does not change, so moving it out of iter.map
chiragaggarwal May 29, 2014
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13 changes: 9 additions & 4 deletions src/main/scala/shark/execution/HadoopTableReader.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@ import org.apache.hadoop.hive.serde2.`lazy`.LazyStruct
import org.apache.hadoop.hive.serde2.objectinspector.{StructObjectInspector, ObjectInspectorConverters}
import org.apache.hadoop.io.Writable
import org.apache.hadoop.mapred.{FileInputFormat, InputFormat, JobConf}
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters.IdentityConverter

import org.apache.spark.broadcast.Broadcast
import org.apache.spark.rdd.{EmptyRDD, HadoopRDD, RDD, UnionRDD}
Expand Down Expand Up @@ -209,10 +210,14 @@ class HadoopTableReader(@transient _tableDesc: TableDesc, @transient _localHConf
convertedRow match {
case _: LazyStruct => convertedRow
case _: HiveColumnarStruct => convertedRow
case _ => tableSerDe.deserialize(
tableSerDe.asInstanceOf[Serializer].serialize(
convertedRow, tblConvertedOI))
}
case _ =>
if (partTblObjectInspectorConverter.isInstanceOf[IdentityConverter]) {

@chenghao-intel chenghao-intel May 23, 2014

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Maybe it's better to move the branch out of the iter.map.

@chiragaggarwal chiragaggarwal May 23, 2014

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for the case, where partTblObjectInspectorConverter.isInstanceOf[IdentityConverter] is true,
the deserialized value needs to be calculated anyways, which is done as part of iter.map, so would it make sense to pull it out of this iter.map, and push it in another one.

@chenghao-intel chenghao-intel May 23, 2014

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Sorry, I mean how about like this?

rowWithPartArr.update(1, partValues) 
if (!partTblObjectInspectorConverter.isInstanceOf[IdentityConverter]) {
  iter.map {...// do as it previously
  }
} else {
  iter.map {
    rowWithPartArr.update(0, partSerDe.deserialize(value))
    rowWithPartArr.asInstanceOf[Object]
 }
}

@chiragaggarwal chiragaggarwal May 23, 2014

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ok, I will edit it.

convertedRow
}
else {
tableSerDe.deserialize( tableSerDe.asInstanceOf[Serializer].serialize( convertedRow, tblConvertedOI))
}
}
}
}
rowWithPartArr.update(0, deserializedRow)
Expand Down