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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-831) Complete overhaul of FieldCache API/Implementation
Date Fri, 24 Apr 2009 20:20:30 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12702526#action_12702526
] 

Michael McCandless commented on LUCENE-831:
-------------------------------------------

{quote}
Grandma! But yeah we need to somehow support probably plain Java
objects rather than every primitive derivative?
{quote}

You mean big arrays (one per doc) of plain-java-objects?  Is Bobo doing that today?  Or do
you mean a single Java obect that, internally, deals with lookup by docID?

{quote}
(In reference to Mark's post 2nd to last post) Bobo efficiently
nicely calculates facets for multiple values per doc which is
the same thing as "multi value faceting"?
{quote}

Neat.  How do you compactly represent (in RAM) multiple values per doc?

{quote}
Are norms and deletes implemented? These would just be byte
arrays in the current approach? If not how would they be
represented? It seems like for deleted docs we'd want the
BitVector returned from a ValueSource.get type of method?
{quote}

The current patch doesn't do this -- but we should think about how this change could absorb
norms/deleted docs, in the future.  We would add a "bit" variant of getXXX (eg that returns
BitVector, BitSet, something).

{quote}
Hmm... Does this mean we'd replace the current IndexReader
method of performing updates on norms and deletes with this more
generic update mechanism?
{quote}

Probably we'd still leave the "sugar" APIs in place, but under the hood their impls would
be switched to this.

bq. It would be cool to get CSF going?

Most definitely!!

> 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
>            Assignee: Mark Miller
>             Fix For: 3.0
>
>         Attachments: ExtendedDocument.java, fieldcache-overhaul.032208.diff, fieldcache-overhaul.diff,
fieldcache-overhaul.diff, LUCENE-831-trieimpl.patch, 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, LUCENE-831.patch,
LUCENE-831.patch, LUCENE-831.patch, LUCENE-831.patch, LUCENE-831.patch, LUCENE-831.patch,
LUCENE-831.patch, LUCENE-831.patch, 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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