Using Ambari Core Services
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HDFS DataNodes

Metrics to see status for the DataNodes.

Table 1. HDFS DataNodes metrics descriptions
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.