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https://issues.apache.org/jira/browse/LUCENE-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130169#comment-14130169
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Tim Smith commented on LUCENE-5940:
-----------------------------------
i fully understand the pain associated with maintaining back compat
i guess it would be good if you (and others) could enumerate all the issues
related here for full perspective (description does not list them)
also, it should be on the developer who removes write support (or removes a
codec) to add the backwards compat support/testing.
creating a new codec that supplants an old codec should not inherently require
removal of write support for old codec.
> change index backwards compatibility policy.
> --------------------------------------------
>
> Key: LUCENE-5940
> URL: https://issues.apache.org/jira/browse/LUCENE-5940
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
>
> Currently, our index backwards compatibility is unmanageable. The length of
> time in which we must support old indexes is simply too long.
> The index back compat works like this: everyone wants it, but there are
> frequently bugs, and when push comes to shove, its not a very sexy thing to
> work on/fix, so its hard to get any help.
> Currently our back compat "promise" is just a broken promise, because we
> cannot actually guarantee it for these reasons.
> I propose we scale back the length of time for which we must support old
> indexes.
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