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From billoley <>
Subject [GitHub] accumulo pull request #291: ACCUMULO-4693: Add instance-specific ProcessName...
Date Fri, 11 Aug 2017 12:29:31 GMT
Github user billoley commented on a diff in the pull request:
    --- Diff: server/base/src/main/java/org/apache/accumulo/server/metrics/
    @@ -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")) {
    --- End diff --
    This was an attempt to not tie the code to a specifc property.  It's probably better to
just use the property.   I can't just pass all of the properties to the metrics system and
defer the decision.  I'm creating a specific tag "ProcessName" that is used by the MetricsRegistry
and metrics2 sinks.  We are using the -Daccumulo.service.instance to deconflict the log file
names (this is why the _ is added to the instance) and to correlate a running process to the
logs.  I'm trying to make it easy to montor the long-running tserver processes by using well-named
metrics that also correlate to the running process and the log file with the same instance
(1, 2, 3, etc).  Since this is only a concern for the tservers, I could grab this property
closer to the top of the call chain (TabletServer.main()) if that would be more acceptable.

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