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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1308) Cache docsets and docs at the SegmentReader level
Date Fri, 24 Jul 2009 21:09:14 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12735159#action_12735159
] 

Yonik Seeley commented on SOLR-1308:
------------------------------------

Absolutely!  We need to get 1.4 out of the way first of course.

One interesting question is the structure of the cache and how to size caches.

One way: if someone specifies a document cache of 128 docs, and we have a cache per segment,
how big should each segment cache be?
One answer is that if a segment represents 10% of the total index, then it should get 10%
of the cache.  There are downsides to that though - it fails to take into account non-uniform
access in the index (hotspots).

> Cache docsets and docs at the SegmentReader level
> -------------------------------------------------
>
>                 Key: SOLR-1308
>                 URL: https://issues.apache.org/jira/browse/SOLR-1308
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: 1.4
>            Reporter: Jason Rutherglen
>            Priority: Minor
>             Fix For: 1.5
>
>   Original Estimate: 504h
>  Remaining Estimate: 504h
>
> Solr caches docsets and documents at the top level Multi*Reader
> level. After a commit, the caches are flushed. Reloading the
> caches in near realtime (i.e. commits every 1s - 2min)
> unnecessarily consumes IO resources, especially for largish
> indexes.
> We can cache docsets and documents at the SegmentReader level.
> The cache settings in SolrConfig can be applied to the
> individual SR caches.

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