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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3082) Add tool to upgrade all segments of an index to last recent supported index format without optimizing
Date Mon, 09 May 2011 10:39:03 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13030676#comment-13030676
] 

Michael McCandless commented on LUCENE-3082:
--------------------------------------------

How about this wording:

Expert: this tool keeps only the last commit in an index; for this
reason, if the incoming index has more than one commit, the tool
refuses to run by default.  Specify -delete-prior-commits to override
this, allowing the tool to delete all but the last commit.

Maybe just call it IndexUpgrader?  (Format seems redundant?)

There's a missing { and } after the "if (commits.size() > 1)"


> Add tool to upgrade all segments of an index to last recent supported index format without
optimizing
> -----------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-3082
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3082
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index
>            Reporter: Uwe Schindler
>            Priority: Minor
>             Fix For: 3.2, 4.0
>
>         Attachments: LUCENE-3082.patch, LUCENE-3082.patch, LUCENE-3082.patch, LUCENE-3082.patch,
index.31.optimized.cfs.zip, index.31.optimized.nocfs.zip
>
>
> Currently if you want to upgrade an old index to the format of your current Lucene version,
you have to optimize your index or use addIndexes(IndexReader...) [see LUCENE-2893] to copy
to a new directory. The optimize() approach fails if your index is already optimized.
> I propose to add a custom MergePolicy to upgrade all segments to the last format. This
MergePolicy could simply also ignore all segments already up-to-date. All segments in prior
formats would be merged to a new segment using another MergePolicy's optimize strategy.
> This issue is different from LUCENE-2893, as it would only support upgrading indexes
from previous Lucene versions in-place using the official path. Its a tool for the end user,
not a developer tool.
> This addition should also go to Lucene 3.x, as we need to make users with pre-3.0 indexes
go the step through 3.x, else they would not be able to open their index with 4.0. With this
tool in 3.x the users could safely upgrade their index without relying on optimize to work
on already-optimized indexes.

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