Using Ambari Core Services
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YARN TimelineServer

Metrics to see the overall status for TimelineServer.

Table 1. YARN Timeline Server metrics descriptions
Row Metrics Description
DATA READS Timeline Entity Data Reads Accumulated number of read operations.
Timeline Entity Data Read time Average time for reading a timeline entity.
DATA WRITES Timeline Entity Data Write Accumulated number of write operations.
Timeline Entity Data Write Time Average time for writing a timeline entity.
JVM METRICS GC Count Accumulated GC count over time.
GC Time Accumulated GC time over time.
Heap Usage Current heap memory usage.
NonHeap Usage Current non-heap memory usage.