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From "Laxman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1798) Memory leak in FastLUCache
Date Sat, 27 Feb 2010 14:39:05 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12839253#action_12839253
] 

Laxman commented on SOLR-1798:
------------------------------

Thanks for quick reponse Yonik.

Following is our analysis so far which may help us in resolving the issue.

1) For every commit cache instances are getting created.[org.apache.solr.search.SolrIndexSearcher]
2) For each cache config we are maintaining a list of Statistics for aggregation.

*One more observation*
>From the Solr stats page I see all the cache stats as 0 values. Following line of code
from FastLRUCache.init looks incorrect.

{noformat}
    cache.setAlive(false);
{noformat}

Because of the above line, all the cache instances created from FastLRUCache are not maintaining
any Stats info.
If this is correct, I dont understand why are we maintaining a list of stats containing zero
values.

Or did I miss something important here?


> Memory leak in FastLUCache
> --------------------------
>
>                 Key: SOLR-1798
>                 URL: https://issues.apache.org/jira/browse/SOLR-1798
>             Project: Solr
>          Issue Type: Bug
>          Components: search
>    Affects Versions: 1.4, 1.5
>            Reporter: Laxman
>             Fix For: 1.5
>
>
> Every time a commit happens two Stats instances [org.apache.solr.common.util.ConcurrentLRUCache.Stats]
are leaking.
> Following code [org.apache.solr.search.FastLRUCache] to maintain cumulative cache statistics
causing this Stats object leak. 
> {noformat}
>     cumulativeStats = (List<ConcurrentLRUCache.Stats>) persistence;
>     cumulativeStats.add(cache.getStats());
> {noformat}
> Everytime a *commit* happens a new cache object is getting created and its stats is added
to the list which is not released at all.

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