2.1. The Widget Version

 The Dashboard Widget version opens first. This view gives you a customizable overview of the state of your cluster as a whole.

The Widget version is divided into two main sections:

 2.1.1. Services Summary

Notice the color of the dot appearing next to each service name in the list of Services . The dot color and blinking action indicates operating status of each service. For example, in the Dashboard Widget image, notice green dot next to each service name. The following colors and actions indicate service status:


Table 2.1. Service Status

Solid GreenAll masters are running
Blinking GreenStarting up
Solid RedAt least one master is down
Blinking RedStopping

Click the service name to open the Services screen, where you can see more detailed information on each service.

 2.1.2. Cluster Status and Metrics

On the main section of the screen, a customizable set of widget tiles presents information on the status of your cluster. There are simple pie and bar charts, more complex usage and load charts, and sets of links to additional data sources, as well as status information like uptime and average RPC queue wait times.


Table 2.2. Widget Interactions

Move widgets around on the screenDrag and drop to desired position
See more detailed informationHover over the widget box

Currently, Ambari displays Metrics for the following services:

  • HDFS

  • YARN

  • HBase

  • Storm


    Metrics data for Storm is buffered and sent as a batch to Ambari every 5 minutes. Anticipate a five-minute delay for appearance of Storm metrics after adding the Storm service.


Table 2.3. Widget Interactions 2

Delete a widgetClick the X, marked in red
Edit a widgetClick the small edit icon, marked in blue. The Customize Widget popup appears.

Follow the instructions in the popup to customize the widget display. In this case, you can adjust the thresholds at which the HDFS Capacity bar chart changes color, from green to orange to red. Click Apply to save your changes. Not all widgets have an edit icon.


Table 2.4. Widget Interactions 3

Add back a deleted widgetClick +Add and use the checkbox to select the widget you want from the dropdown menu
Use quick links to other information, like thread stacks, logs and native component GUIsClick More and select from the dropdown menu
Zoom into more complex charts, like the Network Usage chart.Click the chart. A larger version displays. You can choose to add and remove information from the chart by selecting or deselecting the metric in the legend
Switch to the Classic version, return widgets to default setting, or view metrics in the native Ganglia Server interfaceUse the gear icon

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