data streaming.

close the block and pipeline.

Recover a failed PIPELINE_CLOSE.

pipeline set up for failed PIPELINE_SETUP_APPEND recovery.

pipeline set up for block creation.

pipeline setup for failed data streaming recovery.

transfer Finalized for adding datanodes.

transfer RBW for adding datanodes.

* Block access token information.

* Block information.

* List of block with locations.

* Block and datanodes where is it located.

* Command returned from primary to checkpointing namenode.

* Unique signature to identify checkpoint transactions.

* Message sent from the client to the DN after reading the entire read request.

* Summary of a file or directory.

* Contains a list of paths corresponding to corrupt files and a cookie used for iterative calls to NameNode.listCorruptFileBlocks.

* Identifies a Datanode.

* The status of a Datanode.

* DatanodeInfo array.

* Directory listing.

* Current key and set of block keys at the namenode.

* Extended block idenfies a block.

* File or Directory permision - same spec as posix.

* HDFS Server Defaults.

* Status of a file, directory or symlink Optionally includes a file's block locations if requested by client on the rpc call.

* A LocatedBlock gives information about a block and its location.

* A set of file blocks and their locations.

* Command sent from one namenode to another namenode.

* Information sent by a namenode to identify itself to the primary namenode.

* Namespace information that describes namespace on a namenode.

* Sent as part of the BlockOpResponseProto for READ_BLOCK and COPY_BLOCK operations.

* Block that needs to be recovered with at a given location.

* Enumeration of editlogs available on a remote namenode.

* Editlog information with available transactions.

* Snapshot diff report entry.

* Snapshot diff report.

* Information related to a snapshot TODO: add more information.

* Snapshottable directory listing.

* Status of a snapshottable directory: besides the normal information for a directory status, also include snapshot quota, number of snapshots, and the full path of the parent directory.

* Common node information shared by all the nodes in the cluster.

* void request.

* Version response from namenode.

* Checksum algorithms/types used in HDFS Make sure this enum's integer values match enum values' id properties defined in org.apache.hadoop.util.DataChecksum.Type.

* State of a block replica at a datanode.