# Set up metrics
<a name="emr-hbase-setting-up-metrics"></a>

To monitor the HBase Master, you can set up Amazon CloudWatch Agent to collect specific metrics.

1. **Setting Up HBase Master Metrics** – To monitor the HBase Master, you can set up Amazon CloudWatch Agent to collect specific metrics. Here’s a configuration example to track Master assignment manager activities:

   ```
   [
     {
       "Classification": "emr-metrics",
       "Properties": {},
       "Configurations": [
         {
           "Classification": "emr-hbase-master-metrics",
           "Properties": {
             "Hadoop:service=HBase,name=Master,sub=AssignmentManager": "AssignFailedCount,AssignSubmittedCount",
             "otel.metric.export.interval": "30000"
           },
           "Configurations": []
         }
       ]
     }
   ]
   ```

   In this setup:
   + We specify the MBean (`Hadoop:service=HBase,name=Master,sub=AssignmentManager`) to collect metrics like `AssignFailedCount` and `AssignSubmittedCount`.
   + We set the interval to collect these metrics every 30 seconds (30000 milliseconds).

1. **Setting Up HBase Region Server Metrics** – To monitor HBase Region Servers, configure the CloudWatch Agent as follows:

   ```
   [
     {
       "Classification": "emr-metrics",
       "Properties": {},
       "Configurations": [
         {
           "Classification": "emr-hbase-region-server-metrics",
           "Properties": {
             "Hadoop:service=HBase,name=RegionServer,sub=IPC": "numActiveHandler,numActivePriorityHandler",
             "otel.metric.export.interval": "30000"
           },
           "Configurations": []
         }
       ]
     }
   ]
   ```

   This configuration:
   + Monitors active handlers on the Region Server (`numActiveHandler`, `numActivePriorityHandler`).
   + Uses a 30-second interval for metric collection.

1. **Setting Up HBase REST Server Metrics** – For monitoring the HBase REST interface, you can use the following configuration:

   ```
   [
     {
       "Classification": "emr-metrics",
       "Properties": {},
       "Configurations": [
         {
           "Classification": "emr-hbase-rest-server-metrics",
           "Properties": {
             "Hadoop:service=HBase,name=REST": "successfulPut,successfulScanCount",
             "otel.metric.export.interval": "30000"
           },
           "Configurations": []
         }
       ]
     }
   ]
   ```

   In this example, the CloudWatch Agent collects metrics about successful PUT operations and scan counts every 30 seconds.

1. **Setting Up HBase Thrift Server Metrics** – To monitor the HBase Thrift Server, you can configure metrics with a configuration like the following:

   ```
   [
     {
       "Classification": "emr-metrics",
       "Properties": {},
       "Configurations": [
         {
           "Classification": "emr-hbase-thrift-server-metrics",
           "Properties": {
             "Hadoop:service=HBase,name=Thrift,sub=ThriftOne": "BatchGet_max,BatchGet_mean",
             "otel.metric.export.interval": "30000"
           },
           "Configurations": []
         }
       ]
     }
   ]
   ```

   This setup tracks the maximum and mean times for batch GET operations on the Thrift server.