Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/96#discussion_r10394468
--- Diff: core/src/main/scala/org/apache/spark/storage/MemoryStore.scala ---
@@ -236,13 +236,18 @@ private class MemoryStore(blockManager: BlockManager,
maxMemory: Long)
while (maxMemory - (currentMemory - selectedMemory) < space &&
iterator.hasNext) {
val pair = iterator.next()
val blockId = pair.getKey
- if (rddToAdd.isDefined && rddToAdd == getRddId(blockId)) {
- logInfo("Will not store " + blockIdToAdd + " as it would
require dropping another " +
- "block from the same RDD")
- return false
+ // Apply the same-RDD rule for cache replacement. Quoted from the
+ // original RDD paper:
+ //
+ // When a new RDD partition is computed but there is not
enough
--- End diff --
Hey @liancheng I think it's okay to remove this quote. If you look at the
scaladoc it already explains the intended policy wrt to partitions in the same
RDD - so I think that is sufficient. The scaladoc says "which leads to a
wasteful cyclic replacement pattern for RDDs don't fit into memory that we want
to avoid"
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