The Overview tab for Teradata Hadoop namenode component displays detailed HDFS information about HDFS capacity, files and directories, and blocks in the Hadoop cluster. The namenode Overview tab is accessed by clicking the NAMENODE row under Components Info.
HDFS Capacity
| Capacity | Description |
|---|---|
| Used | Capacity currently used by HDFS |
| Non-DFS Used | Space on the datanodes that is used by files that are not part of DFS |
| Remaining | Space on the datanodes that is not currently in use |
| Total | Total capacity available on the datanodes |
HDFS Files and Directories
| Files + Directories | Description |
|---|---|
| Total | The total number of files and directories in HDFS |
HDFS Blocks
| Blocks | Description |
|---|---|
| Total | Total number of blocks |
| Under-replicated | Number of blocks that do not meet their target replication for the file they belong to |
| Missing | Number of blocks with no replicas anywhere in the cluster |
| Pending Deletion | Number of blocks waiting for deletion |
| Pending Replication | Number of blocks waiting to be replicated |