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https://issues.apache.org/jira/browse/LUCENE-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130180#comment-14130180
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Ryan Ernst commented on LUCENE-5940:
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bq. Maybe another option would be to have a policy that is purely time-based?
I had thought about this before making my suggesting, but I think this has the
problem of being very arbitrary, and hard to know what upgrade path is needed.
For example, if the policy is 1 year, and I am at 4.3, and the latest is 5.6,
how do I know what I need to upgrade to in order to get to 5.6? Is it 5.3.1 or
5.2.4? I think maintaining this table as old versions are dropped would be
difficult in itself.
bq. My idea would be to privtde that tool, including all stuff as a
self-executing JAR file
This is a great idea! In fact, I think we can make one better. We could
provide this tool, as well as a "meta" tool, which knows how to download those
tools for each release. It could then output something like:
{noformat}
Found index version 4.3.2
Latest version is 6.7.0
Upgrading index to 4.99.0...done
Upgrading index to 5.99.0...done
Upgrading index to 6.7.0...done
{noformat}
> 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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