10110346 commented on a change in pull request #23296: [mllib]MergeAggregate
serialize and deserialize function use Bytebuffer to optimize
URL: https://github.com/apache/spark/pull/23296#discussion_r240918718
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File path: mllib/src/main/scala/org/apache/spark/ml/stat/Summarizer.scala
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@@ -609,16 +611,16 @@ private[ml] object SummaryBuilderImpl extends Logging {
= new SummarizerBuffer(requestedMetrics, requestedComputeMetrics)
override def serialize(state: SummarizerBuffer): Array[Byte] = {
- // TODO: Use ByteBuffer to optimize
- val bos = new ByteArrayOutputStream()
+ // Use ByteBuffer
+ val bos = new ByteBufferOutputStream()
val oos = new ObjectOutputStream(bos)
oos.writeObject(state)
bos.toByteArray
Review comment:
`bos.toByteArray` has a data copy.
`bos.toByteArray => bos.toByteBuffer.array`
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