Managing and Monitoring a Cluster
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View cluster heatmaps

The Ambari Web Heatmaps page provides a graphical representation of your overall cluster utilization, using simple color coding known as a heatmap.

A colored block represents each host in your cluster. Colors displayed in the block represent usage in a unit appropriate for the selected set of metrics.
Hovering over a block that represents a host displays more detailed information about that specific host.
A separate window displays metrics about components installed on that host.


If any data necessary to determine usage is not available, the block displays Invalid data.
You can select a different 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