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https://issues.apache.org/jira/browse/SOLR-11389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16431865#comment-16431865
 ] 

Mikhail Khludnev commented on SOLR-11389:
-----------------------------------------

just observed the failure which might be relevant 
https://issues.apache.org/jira/browse/SOLR-12096?focusedCommentId=16431862&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16431862
 

> call registerReporter after Solr(Shard|Cluster)Reporter.setCore[Container]
> --------------------------------------------------------------------------
>
>                 Key: SOLR-11389
>                 URL: https://issues.apache.org/jira/browse/SOLR-11389
>             Project: Solr
>          Issue Type: Task
>          Components: metrics
>            Reporter: Christine Poerschke
>            Assignee: Christine Poerschke
>            Priority: Minor
>             Fix For: 7.2, master (8.0)
>
>         Attachments: SOLR-11389.patch, SOLR-11389.patch
>
>
> Currently 
> [SolrMetricManager.loadReporter|https://github.com/apache/lucene-solr/blob/releases/lucene-solr/7.0.0/solr/core/src/java/org/apache/solr/metrics/SolrMetricManager.java#L823-L844]
>  does four things:
> * creates a new {{SolrMetricReporter}} instance (object)
> * calls {{reporter.init(pluginInfo);}} on the object
> * calls {{registerReporter(registry, pluginInfo.name, tag, reporter);}} for 
> the object
> * {{return reporter;}} returns the object
> For the returned object the {{SolrMetricManager.loadShardReporters}} and 
> {{SolrMetricManager.loadClusterReporters}} callers of 
> SolrMetricManager.loadReporter then call the 
> {{((SolrShardReporter)reporter).setCore(core);}} or 
> {{((SolrClusterReporter)reporter).setCoreContainer(cc);}} method. This means 
> that {{registerReporter}} happened before the SolrShardReporter and 
> SolrClusterReporter objects were fully set up. _(I have not yet fully 
> investigated if this might be unintentional-and-not-required or 
> intentional-and-required.)_
> The changes proposed in this ticket can be summarised as follows:
> * SolrMetricReporter.java
> {code}
> -  public SolrMetricReporter loadReporter(...) throws Exception {
> +  public void               loadReporter(...) throws Exception {
>      ...
>      try {
> -      reporter.init(pluginInfo);
> +      if (reporter instanceof SolrShardReporter) {
> +        ((SolrShardReporter)reporter).init(pluginInfo, solrCore);
> +      } else if (reporter instanceof SolrClusterReporter) {
> +        ((SolrClusterReporter)reporter).init(pluginInfo, coreContainer);
> +      } else {
> +        reporter.init(pluginInfo);
> +      }
>      } catch (IllegalStateException e) {
>        throw new IllegalArgumentException("reporter init failed: " + 
> pluginInfo, e);
>      }
>      registerReporter(registry, pluginInfo.name, tag, reporter);
> -    return reporter;
>    }
> {code}
> * SolrShardReporter.java
> {code}
> +  @Override
> +  public void init(PluginInfo pluginInfo) {
> +    throw new 
> UnsupportedOperationException(getClass().getCanonicalName()+".init(PluginInfo)
>  is not supported, use init(PluginInfo,SolrCore) instead.");
> +  }
> -  public void setCore(SolrCore core) {
> +  public void init(PluginInfo pluginInfo, SolrCore core) {
> +    super.init(pluginInfo);
>      ...
>    }
> {code}
> * SolrClusterReporter.java
> {code}
> +  @Override
> +  public void init(PluginInfo pluginInfo) {
> +    throw new 
> UnsupportedOperationException(getClass().getCanonicalName()+".init(PluginInfo)
>  is not supported, use init(PluginInfo,CoreContainer) instead.");
> +  }
> -  public void setCoreContainer(CoreContainer cc) {
> +  public void init(PluginInfo pluginInfo, CoreContainer cc) {
> +    super.init(pluginInfo);
>      ...
>    }
> {code}
> Context and motivation for the proposed changes is to support (in SOLR-11291) 
> the factoring out of an abstract SolrCoreReporter class, allowing folks to 
> create new reporters that 'know' the SolrCore they are reporting on.



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