adoroszlai commented on code in PR #3772:
URL: https://github.com/apache/ozone/pull/3772#discussion_r984401332
##########
hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/server/http/HttpServer2Metrics.java:
##########
@@ -91,4 +90,10 @@ public void getMetrics(MetricsCollector collector, boolean
all) {
.addGauge(HttpServer2MetricsInfo.HttpServerThreadQueueWaitingTaskCount,
threadPool.getQueueSize());
}
+
+ public void unRegister() {
+ MetricsSystem ms = DefaultMetricsSystem.instance();
+ ms.unregisterSource(NAME);
Review Comment:
If we want to allow multiple `HttpServer2` objects to share the same
`HttpServer2Metrics` instance, then it should be reference-counted, and
unregistration should happen only when the last reference is removed.
##########
hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/server/http/HttpServer2Metrics.java:
##########
@@ -91,4 +90,10 @@ public void getMetrics(MetricsCollector collector, boolean
all) {
.addGauge(HttpServer2MetricsInfo.HttpServerThreadQueueWaitingTaskCount,
threadPool.getQueueSize());
}
+
+ public void unRegister() {
Review Comment:
Should be `synchronized` to ensure consistent synchronization when accessing
`instance`. (I guess findbugs also complains about this.)
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