HDFS - NameNodes
Metrics to see status for the NameNodes.
Row |
Metrics |
Description |
---|---|---|
RPC CLIENT QUEUE TIME |
RPC Client Port Queue Time |
Average time that a RPC request (on the RPC port facing to the HDFS clients) waits in the queue. |
RPC Client Port Queue Num Ops |
Total number of RPC requests in the client port queue. | |
RPC CLIENT PORT PROCESSING TIME |
RPC Client Port Processing Time |
Average RPC request processing time in milliseconds, on the client port. |
RPC Client Port Processing Num Ops |
Total number of RPC active requests through the client port. | |
GC COUNT & GC TIME |
GC Count |
Shows the JVM garbage collection rate on the NameNode. |
GC Time |
Shows the garbage collection time in milliseconds. | |
GC PAR NEW |
GC Count Par New |
The number of times young generation garbage collection happened. |
GC Time Par New | Indicates the duration of young generation garbage collection. | |
GC EXTRA SLEEP & WARNING THRESHOLD EXCEEDED |
GC Extra Sleep Time |
Indicates total garbage collection extra sleep time. |
GC Warning Threshold Exceeded Count |
Indicates number of times that the garbage collection warning threshold is exceeded | |
RPC CLIENT PORT QUEUE & BACKOFF |
RPC Client Port Queue Length |
Indicates the current length of the RPC call queue. |
RPC Client Port Backoff |
Indicates number of client backoff requests. | |
RPC SERVICE PORT QUEUE & NUM OPS |
RPC Service Port Queue Time |
Average time a RPC request waiting in the queue, in milliseconds. These requests are on the RPC port facing to the HDFS services, including DataNodes and the other NameNode. |
RPC Service Port Queue Num Ops |
Total number of RPC requests waiting in the queue. These requests are on the RPC port facing to the HDFS services, including DataNodes and the other NameNode. | |
RPC SERVICE PORT PROCESSING TIME & NUM OPS |
RPC Service Port Processing Time |
Average RPC request processing time in milliseconds, for the service port. |
RPC Service Port Processing Num Ops |
Number of RPC requests processed for the service port. | |
RPC SERVICE PORT CALL QUEUE LENGTH & SLOW CALLS |
RPC Service Port Call Queue Length |
The current length of the RPC call queue. |
RPC Service Port Slow Calls |
The number of slow RPC requests, for the service port. | |
TRANSACTIONS SINCE LAST EDIT & CHECKPOINT |
Transactions Since Last Edit Roll |
Total number of transactions since the last editlog segment. |
Transactions Since Last Checkpoint |
Total number of transactions since the last editlog segment checkpoint. | |
LOCK QUEUE LENGTH & EXPIRED HEARTBEATS |
Lock Queue Length |
Shows the length of the wait Queue for the FSNameSystemLock. |
Expired Heartbeats |
Indicates the number of times expired heartbeats are detected on NameNode. | |
THREADS BLOCKED / WAITING |
Threads Blocked |
Indicates the number of threads in a BLOCKED state, which means they are waiting for a lock. |
Threads Waiting |
Indicates the number of threads in a WAITING state, which means they are waiting for another thread to perform an action. |