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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-3486) The memory size of Solr caches should be configurable
Date Fri, 25 May 2012 16:24:23 GMT

     [ https://issues.apache.org/jira/browse/SOLR-3486?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Adrien Grand updated SOLR-3486:
-------------------------------

    Attachment: LFUMap.java

I've just uploaded LFUMap.java based on your implementation of LFUCache. To have a LFU cache
with configurable maximum size in bytes, just wrap an instance of this class into a SizableCache.

I uploaded this file to show how SizableCache could be used with different kinds of backends.
But building a LFUCache is a different issue. I think we should continue the discussion on
LFUCache on SOLR-3393 and only discuss configurability of the mem size of Solr caches here.
Feel free to reuse the code LFUMap.java if you want, just beware that I didn't test it much.
:-)
                
> The memory size of Solr caches should be configurable
> -----------------------------------------------------
>
>                 Key: SOLR-3486
>                 URL: https://issues.apache.org/jira/browse/SOLR-3486
>             Project: Solr
>          Issue Type: Improvement
>          Components: search
>            Reporter: Adrien Grand
>            Priority: Minor
>         Attachments: LFUMap.java, SOLR-3486.patch, SOLR-3486.patch
>
>
> It is currently possible to configure the sizes of Solr caches based on the number of
entries of the cache. The problem is that the memory size of cached values may vary a lot
over time (depending on IndexReader.maxDoc and the queries that are run) although the JVM
heap size does not.
> Having a configurable max size in bytes would also help optimize cache utilization, making
it possible to store more values provided that they have a small memory footprint.

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