Github user mridulm commented on a diff in the pull request: https://github.com/apache/spark/pull/43#discussion_r10156359 --- Diff: core/src/main/scala/org/apache/spark/storage/DiskStore.scala --- @@ -84,12 +84,27 @@ private class DiskStore(blockManager: BlockManager, diskManager: DiskBlockManage override def getBytes(blockId: BlockId): Option[ByteBuffer] = { val segment = diskManager.getBlockLocation(blockId) val channel = new RandomAccessFile(segment.file, "r").getChannel() - val buffer = try { - channel.map(MapMode.READ_ONLY, segment.offset, segment.length) - } finally { - channel.close() + + val buffer = + // For small files, directly read rather than memory map + if (segment.length < 2 * 4096) { --- End diff -- How was this 8k limit arrived at ?
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