rzo1 commented on code in PR #3639:
URL: https://github.com/apache/storm/pull/3639#discussion_r1566353967
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storm-client/src/jvm/org/apache/storm/metric/SystemBolt.java:
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@@ -67,12 +68,56 @@ public Long getValue() {
context.registerGauge("newWorkerEvent", new NewWorkerGauge());
+ context.registerGauge("workerCpuUsage", new WorkerCpuMetric());
int bucketSize =
ObjectReader.getInt(topoConf.get(Config.TOPOLOGY_BUILTIN_METRICS_BUCKET_SIZE_SECS));
registerMetrics(context, (Map<String, String>)
topoConf.get(Config.WORKER_METRICS), bucketSize, topoConf);
registerMetrics(context, (Map<String, String>)
topoConf.get(Config.TOPOLOGY_WORKER_METRICS), bucketSize, topoConf);
}
+ private class WorkerCpuMetric implements Gauge<Double> {
+ private long lastCalculationTimeNsec;
+ private long previousCpuTotal;
+ private double cpuUsage;
+
+ WorkerCpuMetric() {
+ lastCalculationTimeNsec = System.nanoTime();
+ previousCpuTotal = getTotalCpuUsage();
+ cpuUsage = 0.0d;
+ }
+
+ private long getTotalCpuUsage() {
+ long totalCpuNsecs = 0L;
+ ThreadMXBean threadMxBean = ManagementFactory.getThreadMXBean();
+ for (Long threadId : threadMxBean.getAllThreadIds()) {
+ long threadCpu = threadMxBean.getThreadCpuTime(threadId);
+ if (threadCpu > 0L) {
+ totalCpuNsecs += threadCpu;
+ }
+ }
+ return totalCpuNsecs;
+ }
+
+ private void updateCalculation() {
+ // we could have multiple reporters calling getValue() one right
+ // after another, with inaccurate reporting due to the small time
difference.
+ long elapsed = System.nanoTime() - this.lastCalculationTimeNsec;
+ if (elapsed >= 1000000000L) {
Review Comment:
Maybe introduce a constant here? I think, that a constant instead of this
magic number would be more readable here. Something like `private static final
long THRESHOLD = TimeUnit.NANOSECONDS.convert(1, TimeUnit.SECONDS);` , wdyt?
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