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From "Erick Erickson (JIRA)" <>
Subject [jira] [Resolved] (SOLR-8663) Multiple searchers open for a single core causing memory issues
Date Tue, 09 Feb 2016 14:53:18 GMT


Erick Erickson resolved SOLR-8663.
    Resolution: Invalid

First, please discuss this kind of thing on the user's list and/or the dev list before raising
a JIRA, we try to keep JIRAs for code changes. You'll get more responses faster there.

This is almost certainly a problem in your custom code where you're not properly closing searchers.
Indeed, when you keep a searcher open it chews up memory.

As for the warmup, warming a bunch of searchers at once usually means you're opening them
too rapidly and is an anti-pattern.

Closing this until we have an indication that this is a Solr issue rather than a custom code

> Multiple searchers open for a single core causing memory issues
> ---------------------------------------------------------------
>                 Key: SOLR-8663
>                 URL:
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 4.6
>            Reporter: Dhritiman Das
> For a single core, we are having multiple searchers open. Although the current searcher
points to the latest searcher opened, some old searchers are not getting cleaned up , they
are holding their cache and ultimately causing memory issues. 
> Possibly for cores which are taking a lot of time to warmup their cache the replication
interval is overlapping with warmup time taken for the last searcher open during last replication.
> However any idea why sometimes old searchers are not getting freed ?
> Ex. Searchers from couple of days back are still seen in Solr console.
> ip:port/solr/admin.html#/<core-name>/plugins/core
> Is there any known bug around this for Solr 4.6 ?
> p.s.: we have custom code extending some Solr components at many places. What I am trying
to understand also is what is the best place to start debugging this ?

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