Nodes

Nodes Dashboard

The Nodes dashboard provides detailed information about processes and services installed in one or multiple nodes. The following image displays the dashboard options.

Dashboard

Overall

The Overall tab displays the following information of connected nodes.

Services
Utilization

Services

The Services tile displays the list of services in the node and the count of nodes that are currently active. As an example, in the following screenshot, AmbariAgent service is up on all 7 nodes and FlumeAgent is down on one node.

Note Click the icon to hide the services tile and to display click the icon to hide the services tile.

Hover over the node count to view the nodes that are up or down.

Utilization

The Utilization tile displays the heatmap of all connected nodes for the last one hour by default at a time interval of two minutes as shown in the following image.

Heatmap

Note To know more about a heatmap, see chart types.

To view statistics from a custom date range, click the calendar icon and select a time frame and timezone of your choice.

For every node, you can view the heatmap for the following metrics: To change the metric, click the drop-down next to the Metric label and click a metric of your choice.

Metric	Description
CPU Usage	The amount of CPU utilized (in %).
Load	The average of the number of tasks waiting in a kernel run queue over a period of time.
Mem Usage	The amount of memory utilized (in %).
Container Count	The number of YARN containers running on a node.

Search Option

To search a record in the Nodes, perform the following

Click the search bar located in the top of the Utilization Chart.
Select the required parameters from the drop down menu for the value you are searching for. For example, if you are searching for host hdp1002, select 'Host" from the drop-down, then =, followed by the name from the drop-down menu in the search bar.
Press enter or click Search.

Search Option

Important

For String Data type fields, you can use the =~ operator. This operator allows you to search strings by entering partial string. You can also use regular expressions to search a required value.

Sort By

You can sort the Utilization heatmap by the following preferences:

Host
Min Utilization
Max Utilization

Note To change the sorting, click the drop-down next to the Sort By label and click a sorting preference. By default, it is sorted by hosts.

Filtering

You can apply filter to the name of the Host and Node Label. To apply filter, perform the following:

Click on the Host or Node Label for which you want to apply the filter. A drop-down list is displayed with the list.
Select the option from the list. The details for the selected option are displayed.
(Optional) You can search by using the search box in the drop-down list.
(Optional) Select All to clear the applied filter (or) click Reset to clear the applied filter.

Searching

You can use the search box to search for a job. To know more on how to search a job using search box, see Searching in Pulse.

Utilization Table

The Utilization table displays the following metrics for nodes:

Note To sort the column values, click the icon to sort in ascending , or descending order.

Metric	Description
Checkbox	Click the checkbox to select or deselect host.
Host	The host name. Click on the host name to view details of the host in the Node Details page.
Application Status	The status of the application, either connected or disconnected. Click the icon to view the list of applications.
Type	The type of node, either Compute Node or Data Node.
Load	The average of the number of tasks waiting in a kernel run queue over a period of time.
CPU Usage %	The amount of CPU utilized (in %).
Disk Usage $	The amount of disk utilized (in %).
Read Time	The time taken to perform read operations in the node.
Write Time	The time taken to perform write operations in the node.
Mem Usage %	The amount of memory utilized (in %).
# of Container	The number of YARN containers running on a node.
Logs	The log file of the node. Click the log icon to display the Logs.

Following is a view of how to adjust the width of the column manually:

Click the and button at the top right corner of the page, to toggle between play and pause respectively. Click the Play button to refresh the HBase cluster status every ten seconds. Click the Pause button to temporarily stop the refresh.

Viewing Summary

To view aggregated summary details of two or more nodes, select any two more nodes from the Utilization table and click View Summary button. The aggregated details for the selected host are displayed in the Node Aggregated Details page.

Acceldata Utilization

The Acceldata Utilization tile displays the usage of the following Acceldata metrics on your cluster.

Metric
Data In Out Per Sec	The amount of incoming and outgoing data. This data is tracked in the form of Received Bytes and Transfer Bytes.
Acceldata CPU Usage	The amount of CPU utilized. You can monitor the following CPU metrics: - filebeat - Telegraf
Acceldata Memory Usage	The amount of memory utilized. You can monitor the following memory-related metrics: - filebeat - Telegraf

For CPU usage and Memory usage charts, you can view the utilization by host. Click the drop-down in the top right corner of the chart and select a host.

Why is there no data being displayed for JVM GC Count and JVM GC Time on the Node Details page for Spark Master and Spark Worker Nodes ?

These charts are not supported for Spark in the current release. In a future release, this will be supported.

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