Oracle Hadoop NameNode

Application Metrics

The following table lists the metrics and their description.

Metric	Description
Create Rate	Number of create operations
Delete Rate	Number of delete operations
Rename Rate	Number of rename operations
Syncs Rate	Number of synchronization operations

Block Metrics

The following table lists the metrics and their description.

Metric	Description
Block Capacity	Block capacity if Hadoop Distributed File System target
Blocks Total	Total blocks of Hadoop Distributed File System target
Blocks With Corrupt Replicas	Number of blocks with corrupt replicas
Excess Blocks	Total number of excess blocks
Missing Blocks	Total number of missing blocks

Memory Resource Metrics

The following table lists the metrics and their description.

Metric	Definition
DFS Capacity	Total configured Hadoop Distributed File System storage capacity
DFS Capacity Free	Free storage space
DFS Capacity Used	Storage space used by Hadoop Distributed File System files
DFS Capacity Used Non HDFS	Storage space used by non-Hadoop Distributed File System files
JVM Blocked Threads	Blocked threads
JVM Heap Used	Total amount of used heap memory
JVM Max Memory	Maximum allowed memory
JVM New Threads	New threads
JVM Runnable Threads	Runnable threads
JVM Terminated Threads	Terminated threads
JVM Times Waiting Threads	Timed waiting threads
JVM Waiting Threads	Waiting threads
Resident Memory	Resident memory used
Virtual Memory	Virtual memory used

Read Write Metrics

The following table lists the metric and their description.

Metric	Description
Time Since Last Checkpoint	The time since the last file system checkpoint
RPC Call Queue Length	RPC call queue length
RPC Open Connections	Open RPC connections
Transactions Since Last Checkpoint	Transactions since last log checkpoint
Transactions Since Last Log Roll	Transactions since last log roll

Response Metrics

The following table lists the metrics and its description.

Metric	Description
Response	Status of the target