Database Reference
In-Depth Information
Figure 16.11
HDFS Service summary
The HDFS NameNode Summary graph provides the particulars for
performance information for the NameNode. Specifically the summary set
of graphs details memory heap utilization, threads status, garbage collection
time in milliseconds, and average RPC wait time. The memory heap
utilization is important to monitor because as your cluster grows in the
number offiles itneeds tokeep track of,thentheamount ofmemory needed
to maintain file location will also continue to grow. The graph will show you
the difference between memory committed and memory used. The Threads
Status report details how many Threads are runnable, blocked, and waiting.
There are also the Garbage Collection Time and Average RPC Wait Time
reports. If the RPC wait time is high, a job or an application is performing
too many NameNode operations.
Figure 16.12
shows the NameNode
summary graphs.
