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From "Uwe Schindler (JIRA)" <>
Subject [jira] Commented: (LUCENE-831) Complete overhaul of FieldCache API/Implementation
Date Tue, 15 Jan 2008 10:15:34 GMT


Uwe Schindler commented on LUCENE-831:

I did some extensive tests with Lucene 2.3 today and was wondering, that IndexReader.reopen()
in combination with FieldCache/Sorting does not bring a performance increase.

Until now, even if you reopen an Index using IndexReader.reopen(), you will get a new IndexReader
instance which is not available in the default FieldCache. Because of that, all values from
the cached fields must be reloaded. As reopen() only opens new/changed segments, a FieldCache
implementation directly embedded into IndexReader as propsed by this issue would help here.
Each segment would have its own FieldCache and reopening would be quite fast.

As with Lucene 2.3 the reopen is possible, how about this issue? Would this be possible for

> Complete overhaul of FieldCache API/Implementation
> --------------------------------------------------
>                 Key: LUCENE-831
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Hoss Man
>            Assignee: Michael Busch
>         Attachments: fieldcache-overhaul.diff, fieldcache-overhaul.diff
> 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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