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From "Alex Vigdor (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-831) Complete overhaul of FieldCache API/Implementation
Date Thu, 20 Nov 2008 14:56:44 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649385#action_12649385
] 

Alex Vigdor commented on LUCENE-831:
------------------------------------

To be honest, the cache never successfully refilled before the patch - or at least I gave
up after waiting 10 minutes.  I was about to give up on sorting.  It could have to do with
the fact that we're running with a relatively modest amount of RAM (768M) given our index
size. But with the patch at least sorting is a realistic option!

I will look at adding the warming to my own code as you suggest; it is another peculiarity
of this project that I can't know in the code what fields will be used for sorting, but I'll
just track the searches coming through and aggregate any sorts they perform into a warming
query.

> Complete overhaul of FieldCache API/Implementation
> --------------------------------------------------
>
>                 Key: LUCENE-831
>                 URL: https://issues.apache.org/jira/browse/LUCENE-831
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Hoss Man
>             Fix For: 3.0
>
>         Attachments: fieldcache-overhaul.032208.diff, fieldcache-overhaul.diff, fieldcache-overhaul.diff,
LUCENE-831.03.28.2008.diff, LUCENE-831.03.30.2008.diff, LUCENE-831.03.31.2008.diff, LUCENE-831.patch,
LUCENE-831.patch, LUCENE-831.patch
>
>
> Motivation:
> 1) Complete overhaul the API/implementation of "FieldCache" type things...
>     a) eliminate global static map keyed on IndexReader (thus
>         eliminating synch block between completley independent IndexReaders)
>     b) allow more customization of cache management (ie: use 
>         expiration/replacement strategies, disk backed caches, etc)
>     c) allow people to define custom cache data logic (ie: custom
>         parsers, complex datatypes, etc... anything tied to a reader)
>     d) allow people to inspect what's in a cache (list of CacheKeys) for
>         an IndexReader so a new IndexReader can be likewise warmed. 
>     e) Lend support for smarter cache management if/when
>         IndexReader.reopen is added (merging of cached data from subReaders).
> 2) Provide backwards compatibility to support existing FieldCache API with
>     the new implementation, so there is no redundent caching as client code
>     migrades to new API.

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