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From "Tim Smith (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4560) Support Filtering Segments During Merge
Date Mon, 19 Nov 2012 15:40:58 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13500322#comment-13500322
] 

Tim Smith commented on LUCENE-4560:
-----------------------------------

Uwe,

i plan to investigate your suggestions, and it may result in not requiring any additional
patching to lucene.
it'll be about a week before i can get to that and i will post my results then.
i still don't see the addIndexes() approach as viable, even how you suggest as that will require
up front migration steps instead of gradual migration. The merge policy approach you suggested
will likely be more useful to me, however this will be a nasty merge policy.
                
> Support Filtering Segments During Merge
> ---------------------------------------
>
>                 Key: LUCENE-4560
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4560
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Tim Smith
>         Attachments: LUCENE-4560.patch, LUCENE-4560-simple.patch
>
>
> Spun off from LUCENE-4557
> It is desirable to be able to filter segments during merge.
> Most often, full reindex of content is not possible.
> Merging segments can sometimes have negative consequences when fields are have different
options (most restrictive option is forced during merge)
> Being able to filter segments during merges will allow gradually migrating indexed data
to new index settings, support pruning/enhancing existing data gradually
> Use Cases:
> * Migrate IndexOptions for fields (See LUCENE-4557)
> * Gradually Remove index fields no longer used
> * Migrate indexed sort fields to DocValues
> * Support converting data types for indexed data
> * and so on
> patch will be forthcoming

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