Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/2131#discussion_r16760036
--- Diff: core/src/main/scala/org/apache/spark/CacheManager.scala ---
@@ -68,7 +68,9 @@ private[spark] class CacheManager(blockManager:
BlockManager) extends Logging {
// Otherwise, cache the values and keep track of any updates in
block statuses
val updatedBlocks = new ArrayBuffer[(BlockId, BlockStatus)]
val cachedValues = putInBlockManager(key, computedValues,
storageLevel, updatedBlocks)
- context.taskMetrics.updatedBlocks = Some(updatedBlocks)
+ val metrics = context.taskMetrics
+ val lastUpdatedBlocks =
metrics.updatedBlocks.getOrElse(Seq[(BlockId, BlockStatus)]())
+ metrics.updatedBlocks = Some(lastUpdatedBlocks ++
updatedBlocks.toSeq)
--- End diff --
I raised this in the other PR and since we have a new one I'll just ask
again. Can you explain what this fixes? My understanding is that this can only
be called once per task, and since this is the only place where we set
`updatedBlocks` I don't see how the original `TaskMetrics` could already have
updated blocks.
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