Github user ctubbsii commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/291#discussion_r133086237
--- 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")) {
--- End diff --
I'm not sure it matters where in the call chain it's grabbed. I don't
really know much about the Hadoop Metrics library. I was thinking maybe you
could create a "SystemProperties" tag or something like that, and then on the
client side of the metrics, pull out the specific property you need. That way,
the only thing tied to the specific property was the launch script and the
metrics consumer... and not any part of Accumulo's code.
However, if that is not feasible for whatever reason, using the specific
flag, if present, seems perfectly appropriate to me to me. It's basically what
we did for the monitor log appender.
If you wanted to push the service name implementation into the
TabletServer, rather than the metrics code, that would work, too. Could create
a method, `tabletServer.getServiceName()` or similar, to place the
property-retrieval implementation.
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