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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 10:06:23 GMT

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

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

    Attachment: SOLR-3486.patch

Hi Shawn,

I modified the patch in order to make it easier to add this functionality to other cache implementations.
All you need to do for SOLR-3393 to support maximum memory size is to split your implementation
into a LFU map (a regular map, with no evictions) which iterates (entrySet().iterator()) in
frequency order and a LFU cache (that will probably extend or wrap this LFU map). Then to
have a LFU cache with a fixed max mem size, just wrap your LFU map into a new SizableCache
instance.
                
> 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: 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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