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Date: Thu, 11 Sep 2014 15:29:34 +0000 (UTC)
From: "Robert Muir (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Message-ID: <JIRA.12740794.1410445451000.9748.1410449374860@Atlassian.JIRA>
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Subject: [jira] [Commented] (LUCENE-5940) change index backwards
 compatibility policy.
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    [ https://issues.apache.org/jira/browse/LUCENE-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130141#comment-14130141 ] 

Robert Muir commented on LUCENE-5940:
-------------------------------------

{quote}
however, 5.0 should ideally continue to support 4.0-4.99 indexes (at least from the codec/index reading perspective)
{quote}

Who will do the work? Who will maintain this? 

Won't be 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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