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Posted to dev@lucene.apache.org by "ASF subversion and git services (JIRA)" <ji...@apache.org> on 2016/10/03 07:35:20 UTC
[jira] [Commented] (LUCENE-7457) Default doc values format should
optimize for iterator access
[ https://issues.apache.org/jira/browse/LUCENE-7457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15541777#comment-15541777 ]
ASF subversion and git services commented on LUCENE-7457:
---------------------------------------------------------
Commit 2f88bc80c2c1afed975199adb3f340fcec8179aa in lucene-solr's branch refs/heads/master from [~jpountz]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=2f88bc8 ]
LUCENE-7457: Make Lucene54DocValuesFormat's sparse case actually implement an iterator.
> Default doc values format should optimize for iterator access
> -------------------------------------------------------------
>
> Key: LUCENE-7457
> URL: https://issues.apache.org/jira/browse/LUCENE-7457
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Adrien Grand
> Priority: Blocker
> Fix For: master (7.0)
>
> Attachments: LUCENE-7457.patch
>
>
> In LUCENE-7407 we switched doc values consumption from random access API to an iterator API, but nothing was done there to improve the codec. We should do that here.
> At a bare minimum we should fix the existing very-sparse case to be a true iterator, and not wrapped with the silly legacy wrappers.
> I think we should also increase the threshold (currently 1%?) when we switch from dense to sparse encoding. This should fix LUCENE-7253, making merging of sparse doc values efficient ("pay for what you use").
> I'm sure there are many other things to explore to let codecs "take advantage" of the fact that they no longer need to offer random access to doc values.
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