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From "Shai Erera (JIRA)" <>
Subject [jira] Commented: (LUCENE-1678) Deprecate Analyzer.tokenStream
Date Wed, 10 Jun 2009 16:14:07 GMT


Shai Erera commented on LUCENE-1678:

We've had this thread,
and in the latest post (
I tried to put together some wording for a revised (and relaxed) back-compat policy. I believe
it was Grant who asked for some writeup to get to the users' list, and I read also that we
may want to discuss each item separately, to get to a consensus.

Perhaps we can continue the discussion on that thread, and try to get to a consensus on any
of the items? We don't necessarily need to change all of it in one day, but getting some feedback
from you on any of the items can help bring that discussion back to life, and hopefully reach
a consensus.

As was said on this thread, persistence will eventually drive us to reach a consensus, so
I'm being persistent :).

> Deprecate Analyzer.tokenStream
> ------------------------------
>                 Key: LUCENE-1678
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Analysis
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 2.9
> The addition of reusableTokenStream to the core analyzers unfortunately broke back compat
of external subclasses:
> On upgrading, such subclasses would silently not be used anymore, since Lucene's indexing
invokes reusableTokenStream.
> I think we should should at least deprecate Analyzer.tokenStream, today, so that users
see deprecation warnings if their classes override this method.  But going forward when we
want to change the API of core classes that are extended, I think we have to  introduce entirely
new classes, to keep back compatibility.

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