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