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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2921) Now that we track the code version at the segment level, we can stop tracking it also in each file level
Date Tue, 15 Feb 2011 13:09:57 GMT
Now that we track the code version at the segment level, we can stop tracking it also in each
file level
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                 Key: LUCENE-2921
                 URL: https://issues.apache.org/jira/browse/LUCENE-2921
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Index
            Reporter: Shai Erera
             Fix For: 3.2, 4.0


Now that we track the code version that created the segment at the segment level, we can stop
tracking versions in each file. This has several major benefits:
# Today the constant names that use to track versions are confusing - they do not state since
which version it applies to, and so it's harder to determine which formats we can stop supporting
when working on the next major release.
# Those format numbers are usually negative, but in some cases positive (inconsistency) --
we need to remember to increase it "one down" for the negative ones, which I always find confusing.
# It will remove the format tracking from all the *Writers, and the *Reader will receive the
code format (String) and work w/ the appropriate constant (e.g. Constants.LUCENE_30). Centralizing
version tracking to SegmentInfo is an advantage IMO.

It's not urgent that we do it for 3.1 (though it requires an index format change), because
starting from 3.1 all segments track their version number anyway (or migrated to track it),
so we can safely release it in follow-on 3x release.

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