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https://issues.apache.org/jira/browse/LUCENE-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130320#comment-14130320
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Robert Muir commented on LUCENE-5940:
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No offense Tim, but your comments exactly fit my description of this issue.
{quote}
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.
{quote}
I don't care what happens on this issue, personally, I'm done working on back
compat completely until the policy changes. That includes the current
in-progress 4.10.1 release. I've done more than my fair share of fighting it,
and it just causes me endless frustration.
If people care about back compat, then they can go do things like regenerate
indexes from previous lucene versions to ensure they arent buggy like
LUCENE-5939 and that its actually working. They can try to refactor out old
cruft in some way and work on improving the APIs of "dead index formats".
But thats not for me.
> 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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