Review Sharded Clusters
On this page
A sharded cluster is the set of nodes comprising a sharded MongoDB deployment. To view the metrics for a specific Atlas cluster in a project, click the View Monitoring button for that cluster. Alternatively, click on the name of the cluster to open the cluster overview, then click the Metrics tab.
The Metrics tab for sharded clusters provides a side-by-side comparision of shards in one view. The Display drop-down contains many available metrics.
Monitor cluster metrics to identify performance issues and determine whether your current cluster meets your requirements. For more information on the metrics available to monitor your clusters, see Review Available Metrics.
The Metrics view has three distinct sections:
Note
Monitoring Data Storage Granularity
Atlas stores metrics data at increasing granularity levels. For more information, see Monitoring Data Storage Granularity.
Chart Controls
Atlas provides the following controls for the Metric view:
Control | Function |
|---|---|
Granularity | Modifies the granularity of metrics displayed for each chart.
Select a granularity, usually between 1 minute and 1 day (24
hours). Select
In the Sharded Cluster metrics view, Atlas renders a maximum of:
As a result, when rendering metrics for large deployments over a long period of time, Atlas may display metrics at a lower granularity than expected. To learn more about the granularity at which Atlas stores metric data, see Monitoring Data Storage Granularity. Atlas supports a 10 second granularity only on |
Zoom | Modifies the date range of metrics displayed for each chart. Select a zoom range between 1 hour and 5 years. Adjusting the Zoom automatically adjusts the Current Display date range. |
Current Display | Modifies the start and end date-time range of metrics displayed
for each chart. Modifying the start and end date sets the
value of Zoom to |
Display | Selects which metric to chart. You can display no more than one chart at a time. |
Display Data | Directs Atlas to display data based on the selected option
|
View | Selects which sharded cluster components to display
|
Chart Display
When viewing charts, you can do the following:
Task | Action |
|---|---|
Zoom in on a period of time. | Click and drag the mouse pointer over a portion of the chart. To reset to the originally selected range (zoom out), double-click the chart. When you zoom in on one period of time, the Current Display date range in the chart control section automatically updates to reflect the selected period. |
View statistics at a particular time. | Hover the mouse pointer over a point on the chart. |
Data Sources
Atlas displays each data source that contributes to the metric chart in a table below the chart. The table consists of the following:
Column | Description |
|---|---|
Shard Name | |
Alerts | Indicates if there are any open alerts for the listed shard or process. Click on the alert icon to open the Alerts view for that shard or process. For more information on responding to open alerts, see Resolve Alerts. |
Data Size | Only visible if View is set to Indicates the logical size of all documents and indexes on the shard. |
Show | Only visible if View is set to Indicates which replica set members to show on the selected
chart. Select |
Read, Write, and Queued | Metric data related to the displayed chart. Hover over the corresponding column for a pop up with detailed information on the metrics shown. |