apache/spark — pull request #3358 by tdas (2014-11-19 03:22:36+00:00)
Title: [SPARK-4482][Streaming] Disable ReceivedBlockTracker's write ahead log by default

The write ahead log of ReceivedBlockTracker gets enabled as soon as checkpoint directory is set. This should not happen, as the WAL should be enabled only if the WAL is enabled in the Spark configuration.