Github user mridulm commented on a diff in the pull request: https://github.com/apache/spark/pull/96#discussion_r10386811 --- Diff: core/src/main/scala/org/apache/spark/storage/MemoryStore.scala --- @@ -236,13 +236,23 @@ 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 + // space to store it, we evict a partition from the least recently + // accessed RDD, unless this is the same RDD as the one with the + // new partition. In that case, we keep the old partition in memory + // to prevent cycling partitions from the same RDD in and out. + // + // TODO implement LRU eviction --- End diff -- entries is already a LinkedHashMap - so you iterate in LRU : you can remove the comment.
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