Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/1165#discussion_r14325588
--- Diff: core/src/main/scala/org/apache/spark/storage/MemoryStore.scala ---
@@ -55,8 +55,7 @@ private class MemoryStore(blockManager: BlockManager,
maxMemory: Long)
bytes.rewind()
if (level.deserialized) {
val values = blockManager.dataDeserialize(blockId, bytes)
- val elements = new ArrayBuffer[Any]
- elements ++= values
+ val elements = values.toArray
--- End diff --
Good catch. Here we also unroll it entirely in memory.
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