Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/15371#discussion_r82500617
--- Diff: core/src/main/scala/org/apache/spark/executor/TaskMetrics.scala
---
@@ -326,36 +324,13 @@ private[spark] object TaskMetrics extends Logging {
private[spark] class BlockStatusesAccumulator
- extends AccumulatorV2[(BlockId, BlockStatus), java.util.List[(BlockId,
BlockStatus)]] {
- private val _seq = Collections.synchronizedList(new ArrayList[(BlockId,
BlockStatus)]())
-
- override def isZero(): Boolean = _seq.isEmpty
+ extends CollectionAccumulator[(BlockId, BlockStatus)] {
override def copyAndReset(): BlockStatusesAccumulator = new
BlockStatusesAccumulator
override def copy(): BlockStatusesAccumulator = {
val newAcc = new BlockStatusesAccumulator
- newAcc._seq.addAll(_seq)
+ newAcc._list.addAll(_list)
--- End diff --
Don't you just want to call merge() here? it's better not to expose the
internal representation even to subclasses if possible, because we're exposing
it permanently to everyone.
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