[jira] Commented: (LUCENE-1981) Allow access to entries in the field cache

["Yonik Seeley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-1981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12765157#action_12765157 ] 

Yonik Seeley commented on LUCENE-1981:
--------------------------------------

We shouldn't tie IndexReader/SegmentReader to the fieldCache.
All of the public APIs already exist to use the FieldCache instead of  document().

> Allow access to entries in the field cache
> ------------------------------------------
>
>                 Key: LUCENE-1981
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1981
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Search
>    Affects Versions: 2.9
>            Reporter: Tom Hill
>            Priority: Minor
>         Attachments: lucene-1981.patch
>
>
> If the data required is already in the field cache, it seems unnecessary to go to the disk for it, if the data is already in RAM.
> We have a case where we need one field from a large number (500 -1000) of scattered documents in a fairly large index (50-100m docs), and seek time to collect the data from disk is prohibitive, so we'd like to grab the data from the cache, instead.

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