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https://issues.apache.org/jira/browse/LUCENE-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130128#comment-14130128
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Robert Muir commented on LUCENE-5940:
-------------------------------------
{quote}
Having to keep bw compat for all 4.x codecs once 5.0 is released would be a
nightmare.
{quote}
Right, the fallback plan is to release 5.0, then rapidly release 6.0 (maybe
just a few days after) so we can drop all the shit. That doesn't require a
change to the backwards compatibility policy. But i hope everyone understands
how ridiculous that is when we can just be reasonable instead.
> 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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