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https://issues.apache.org/jira/browse/LUCENE-1763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12736643#action_12736643
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Michael McCandless commented on LUCENE-1763:
--------------------------------------------
I think subclassing LMP is also extremely advanced, ie, it's OK to make an
exception to our back-compat policy.
> MergePolicy should require an IndexWriter upon construction
> -----------------------------------------------------------
>
> Key: LUCENE-1763
> URL: https://issues.apache.org/jira/browse/LUCENE-1763
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Shai Erera
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 2.9
>
>
> MergePolicy does not require an IW upon construction, but requires one to be
> passed as method arg to various methods. This gives the impression as if a
> single MP instance can be shared across various IW instances, which is not
> true for all MPs (if at all). In addition, LogMergePolicy uses the IW
> instance passed to these methods incosistently, and is currently exposed to
> potential NPEs.
> This issue will change MP to require an IW instance, however for back-compat
> reasons the following changes will be made:
> # A new MP ctor w/ IW as arg will be introduced. Additionally, for
> back-compat a default ctor will also be declared which will assign null to
> the member IW.
> # Methods that require IW will be deprecated, and new ones will be declared.
> #* For back-compat, the new ones will not be made abstract, but will throw
> UOE, with a comment that they will become abstract in 3.0.
> # All current MP impls will move to use the member instance.
> # The code which calls MP methods will continue to use the deprecated
> methods, passing an IW even that it won't be necessary --> this is strictly
> for back-compat.
> In 3.0, we'll remove the deprecated default ctor and methods, and change the
> code to not call the IW method variants anymore.
> I hope that I didn't leave anything out. I'm sure I'll find out when I work
> on the patch :).
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