Hadoop HDFS Change Log for HDFS-4949 HDFS-4949 (Unreleased) INCOMPATIBLE CHANGES NEW FEATURES IMPROVEMENTS HDFS-5049. Add JNI mlock support. (Andrew Wang via Colin Patrick McCabe) HDFS-5051. Propagate cache status information from the DataNode to the NameNode (Andrew Wang via Colin Patrick McCabe) OPTIMIZATIONS BUG FIXES