Github user pwendell commented on the pull request:
https://github.com/apache/incubator-spark/pull/180#issuecomment-35968583
Hmm okay I'm still wondering if there is a path for in-memory data where
two copies are created:
Cache manager runs:
```
val elements = new ArrayBuffer[Any]
elements ++= computedValues
blockManager.put(key, elements, storageLevel, tellMaster = true)
```
Block manager runs:
```
doPut(blockId, Left(values.toIterator), level, tellMaster)
```
DoPut runs:
```
val res = memoryStore.putValues(blockId, values, level, true)
```
MemoryStore runs:
```
val valueEntries = new ArrayBuffer[Any]()
valueEntries ++= values
```
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