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https://issues.apache.org/jira/browse/SOLR-1508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12765214#action_12765214
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Tom Hill commented on SOLR-1508:
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The key thing I was trying to achieve here was to use per-segment caches.
To do this, I think I need to know which SegmentReader is handling the segment
containing the doc I care about. Unfortunately, DirectoryReader.readerIndex()
and DirectoryReader.starts() are both private, and I _think_ I need this
information to get the cache on a per-segment basis. Corrections welcome!
I went with modifying IndexReader, as the IndexReader hides the implementation.
With this approach, the callers code works, even if the implementation changes;
if someone is wraps your DirectoryReader in a FilterReader, you still just
called getFieldCachedValue.
Any alternate suggestions for getting per-segment caches?
Thanks!
> Use field cache when creating response, if available and configured.
> --------------------------------------------------------------------
>
> Key: SOLR-1508
> URL: https://issues.apache.org/jira/browse/SOLR-1508
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 1.3
> Reporter: Tom Hill
>
> Allow the user to configure a field to be returned to the user from the field
> cache, instead of getting the field from disk. Relies on lucene-1981
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