Github user ctubbsii commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/291#discussion_r132547937
  
    --- Diff: 
server/base/src/main/java/org/apache/accumulo/server/metrics/MetricsSystemHelper.java
 ---
    @@ -16,20 +16,65 @@
      */
     package org.apache.accumulo.server.metrics;
     
    +import java.util.HashMap;
    +import java.util.Map;
    +
     import org.apache.hadoop.metrics2.MetricsSystem;
     import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
    +import org.apache.hadoop.metrics2.source.JvmMetrics;
    +import org.apache.hadoop.metrics2.source.JvmMetricsInfo;
     
     /**
      *
      */
     public class MetricsSystemHelper {
     
    +  private static Map<String,String> serviceNameMap = new HashMap<>();
    +  private static String processName = "Unknown";
    +
    +  static {
    +    serviceNameMap.put("master", "Master");
    +    serviceNameMap.put("tserver", "TabletServer");
    +    serviceNameMap.put("monitor", "Monitor");
    +    serviceNameMap.put("gc", "GarbageCollector");
    +    serviceNameMap.put("tracer", "Tracer");
    +    serviceNameMap.put("shell", "Shell");
    +  }
    +
    +  public static void configure(String application) {
    +    String serviceName = application;
    +    if (MetricsSystemHelper.serviceNameMap.containsKey(application)) {
    +      serviceName = MetricsSystemHelper.serviceNameMap.get(application);
    +    }
    +
    +    // a system property containing 'instance' can be used if more than 
one TabletServer is started on a host
    +    String serviceInstance = "";
    +    if (serviceName.equals("TabletServer")) {
    +      for (Map.Entry<Object,Object> p : System.getProperties().entrySet()) 
{
    +        if (((String) p.getKey()).contains("instance")) {
    +          // get rid of all non-alphanumeric characters and then prefix 
with a -
    +          serviceInstance = "-" + ((String) 
p.getValue()).replaceAll("[^a-zA-Z0-9]", "");
    --- End diff --
    
    Is this transformation necessary to conform to restriction of the metrics 
library?


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