Bulk Operation

HDFS-6185 Improve retry attempt log in DFSOutputStream#completeFile with current attempt number

HDFS-6185 Add additional trace to DataNode#shutdown to track progress

HDFS-6185 Add a counter in the log that shows the number of block reports processed

HDFS-6185 Improve the log for HA failover

HDFS-6185 Adding additional tracing for memory storage eviction algorithm

HDFS-6185 For JournalNode operations that must succeed on all nodes, execute a pre-check to verify that the operation can succeed.

HDFS-6185 When aborting NameNode or JournalNode due to metadata file problems, write the contents of the metadata directories and permissions to logs.

HDFS-6185 Split error checks in AtomicFileOutputStream#close into separate conditions to improve diagnostics.

HDFS-6185 Improve diagnostics on storage directory rename operations by using NativeIO#renameTo in Storage#rename.

HDFS-6185 Show when block deletion will start after NameNode startup in WebUI

HDFS-6185 Check and make checkpoint before stopping the NameNode

HDFS-6185 Pause deletion of blocks when the namenode starts up

HDFS-6185 Capture the number of blocks pending deletion on namenode webUI

HDFS-6185 Provide diagnosis information in the Web UI

HDFS-6185 Save namespace when the namenode is stopped