viirya commented on a change in pull request #26085: [SPARK-29434] [Core]
Improve the MapStatuses Serialization Performance
URL: https://github.com/apache/spark/pull/26085#discussion_r334170378
##########
File path: core/src/main/scala/org/apache/spark/MapOutputTracker.scala
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@@ -822,18 +827,43 @@ private[spark] object MapOutputTracker extends Logging {
} {
objOut.close()
}
- val arr = out.toByteArray
+
+ val arr: Array[Byte] = {
+ val compressedOut = new ByteArrayOutputStream(4096)
+ val zos = new ZstdOutputStream(compressedOut)
Review comment:
Is the default compress level good for us?
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