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https://issues.apache.org/jira/browse/SOLR-13677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16900959#comment-16900959
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Christine Poerschke commented on SOLR-13677:
--------------------------------------------
{code:java}
- public void registerGauge(SolrInfoBean info, String registry, Gauge<?> gauge,
String tag, boolean force, String metricName, String... metricPath) {
+ public GaugeRef registerGauge(SolrInfoBean info, String registry, Gauge<?>
gauge, String tag, boolean force, String metricName, String... metricPath) {
{code}
The above {{registerGauge}} method change to make it return a gauge reference
encourages but does not ensure that the caller 'remembers' the reference and so
that it is later then included in the unregister calls. There's also a small
amount of repetition w.r.t. iterating over the {{myGauges}} collection and
unregistering the elements.
I wonder if some sort of container or wrapper class might be helpful i.e.
{{SolrMetricManager.registerGauge}} would be sure to call 'remember' for the
gauge and the close(\?) method of the producer would call the 'forgetAll'
method. What do you think?
{code:java}
+ class FooBar {
+ private final List<GaugeRef> gaugeRefs = new ArrayList<>();
+ void remember(GaugeRef gaugeRef) {
+ gaugeRefs.add(gaugeRef);
+ }
+ void forgetAll() {
+ for (GaugeRef gaugeRef : gaugeRefs) {
+ gaugeRef.unregister();
+ }
+ gaugeRefs.clear();
+ }
+ }
+
+ public void registerGauge(FooBar memory, SolrInfoBean info, String registry,
Gauge<?> gauge, String tag, boolean force, String metricName, String...
metricPath) {
+ memory.remember(registerGauge(info, registry, gauge, tag, force,
metricName, metricPath));
+ }
+
+ private GaugeRef registerGauge(SolrInfoBean info, String registry, Gauge<?>
gauge, String tag, boolean force, String metricName, String... metricPath) {
- public void registerGauge(SolrInfoBean info, String registry, Gauge<?> gauge,
String tag, boolean force, String metricName, String... metricPath) {
...
{code}
> All Metrics Gauges should be unregistered by the objects that registered them
> -----------------------------------------------------------------------------
>
> Key: SOLR-13677
> URL: https://issues.apache.org/jira/browse/SOLR-13677
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: metrics
> Reporter: Noble Paul
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The life cycle of Metrics producers are managed by the core (mostly). So, if
> the lifecycle of the object is different from that of the core itself, these
> objects will never be unregistered from the metrics registry. This will lead
> to memory leaks
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