[jira] [Commented] (SOLR-5648) SolrCore#getStatistics() should nest open searchers' stats

["Gregg Donovan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-5648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13877553#comment-13877553 ] 

Gregg Donovan commented on SOLR-5648:
-------------------------------------

We use this patch to to graph the number open searchers and the oldest searcher in Ganglia. It's very useful to have an overview of searcher health and for detecting possible leaks. 

!openSearchers.gif|Count of open searchers!

!oldestSearcherStaleness.gif|Age of oldest searcher!

> SolrCore#getStatistics() should nest open searchers' stats
> ----------------------------------------------------------
>
>                 Key: SOLR-5648
>                 URL: https://issues.apache.org/jira/browse/SOLR-5648
>             Project: Solr
>          Issue Type: Task
>            Reporter: Shikhar Bhushan
>            Priority: Minor
>         Attachments: SOLR-5648.patch, oldestSearcherStaleness.gif, openSearchers.gif
>
>
> {{SolrIndexSearcher}} leaks are a notable cause of garbage collection issues in codebases with custom components.
> So it is useful to be able to access monitoring information about what searchers are currently open, and in turn access their stats e.g. {{openedAt}}.
> This can be nested via {{SolrCore#getStatistics()}} which has a {{_searchers}} collection of all open searchers.



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