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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