HDFS - DataNodes
Metrics to see status for the DataNodes.
Row | Metrics |
Description |
---|---|---|
BLOCKS WRITTEN / READ |
Blocks Written |
The rate or number of blocks written to a DataNode. |
Blocks Read |
The rate or number of blocks read from a DataNode. | |
FSYNCH TIME / NUM OPS |
Fsynch Time |
Average fsync time. |
Fsynch Num Ops |
Total number of fsync operations. | |
DATA PACKETS BLOCKED / NUM OPS |
Data Packet Blocked Time |
Indicates the average waiting time of transfering a data packet on a DataNode. |
Data Packet Blocked Num Ops |
Indicates the number of data packets transferred on a DataNode. | |
PACKET TRANSFER BLOCKED / NUM OPS |
Packet Transfer Time |
Average transfer time of sending data packets on a DataNode. |
Packet Transfer Num Ops |
Indicates the number of data packets blocked on a DataNode. | |
NETWORK ERRORS / GC COUNT |
Network Errors |
Rate of network errors on JVM. |
GC Count |
Garbage collection DataNode hits. | |
GC TIME / GC TIME PARNEW |
GC Time |
JVM garbage collection time on a DataNode. |
GC Time ParNew |
Young generation (ParNew) garbage collection time on a DataNode. |