Apache Ambari Operations
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Viewing Cluster Heatmaps

As described earlier, the Ambari web interface home page is divided into a status summary panel on the left, and Metrics, Heatmaps, and Config History tabs at the top, with the Metrics page displayed by default. When you want to view a graphical representation of your overall cluster utilization, clicking Heatmaps provides you with that information, using simple color coding known as a heatmap:

A colored block represents each host in your cluster. You can see more information about a specific host by hovering over its block, which causes a separate window to display metrics about HDP components installed on that host.

Colors displayed in the block represent usage in a unit appropriate for the selected set of metrics. If any data necessary to determine usage is not available, the block displays Invalid data. You can solve this issue by changing the default maximum values for the heatmap, using the Select Metric menu:

Heatmaps supports the following metrics:

Host/Disk Space Used %

disk.disk_free and disk.disk_total

Host/Memory Used %

memory.mem_free and memory.mem_total

Host/CPU Wait I/O %

cpu.cpu_wio

HDFS/Bytes Read

dfs.datanode.bytes_read

HDFS/Bytes Written

dfs.datanode.bytes_written

HDFS/Garbage Collection Time

jvm.gcTimeMillis

HDFS/JVM Heap MemoryUsed

jvm.memHeapUsedM

YARN/Garbage Collection Time

jvm.gcTimeMillis

YARN / JVM Heap Memory Used

jvm.memHeapUsedM

YARN / Memory used %

UsedMemoryMB and AvailableMemoryMB

HBase/RegionServer read request count

hbase.regionserver.readRequestsCount

HBase/RegionServer write request count

hbase.regionserver.writeRequestsCount

HBase/RegionServer compaction queue size

hbase.regionserver.compactionQueueSize

HBase/RegionServer regions

hbase.regionserver.regions

HBase/RegionServer memstore sizes

hbase.regionserver.memstoreSizeMB