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https://issues.apache.org/jira/browse/SOLR-8668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16023854#comment-16023854
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Hoss Man commented on SOLR-8668:
--------------------------------
Christine: I just skimmed {{git diff master...jira/solr-8668}} ...
Most everything looked sane to me. In a few places I got a little confused as
to why some tests/configs were removed instead of just replacing the existing
config with a MergePolicyFactory config -- but I'm guessing that's because an
equivilent MergePolicyFactory based test already exists?
The one thing that jumped out at me is
{{SolrIndexConfig.effectiveUseCompoundFileSetting}}. Now that
{{SolrIndexConfig.fixUseCFMergePolicyInitArg}} is removed, I think we
can/should simplify/remove the (mutable) {{effectiveUseCompoundFileSetting}}
and assocaited methods/hacks into a {{finel boolean useCompoundFile}} just like
every other SOlrIndexConfig setting. right?
bq. Hoping to commit this later this month ...
+1
{quote}
bq. do we need to throw an exception if anyone still configures <mergePolicy>
or is it fair to silently ignore it
I think a warning might be a fair compromise, instead of an exception or silent
ignoring.
{quote}
bq. part 2: small incremental change (replace throwing-exception with
log-warning)
Whoa, whoa ... what? ... no, no no! ... -1!
{{<mergePolicy>}} was deprecated (and stopped appearing in example configs) in
5.5! If someone has been upgrading Solr since then and never bothered to notice
the {{WARN}} in their log file informing them that they should switch to
{{<mergePolicyFactory>}}, there is no sane reason to assume they will notice a
{{WARN}} in their 7.0 logs that it's being completely ignored. Doing that is
effectively the same as silently ignoring their config -- which means the
implicit default {{<mergePolicyFactory>}} will be used while they *think* they
are using some very explicit {{<mergePolicy/>}} and beating their heads against
the wall trying to understand why 7.0 is ignoring their "maxMergedSegmentMB"
etc....
A WARNing is appropriate when config option X is deprecated but still supported
-- but once X is no longer supported at all we should _absolutely_ hard fail if
people are still trying to configure X -- so that so they _know_ they need to
change their config.
> Remove support for <mergePolicy> (in favour of <mergePolicyFactory>)
> --------------------------------------------------------------------
>
> Key: SOLR-8668
> URL: https://issues.apache.org/jira/browse/SOLR-8668
> Project: Solr
> Issue Type: Improvement
> Reporter: Shai Erera
> Assignee: Christine Poerschke
> Priority: Blocker
> Fix For: master (7.0)
>
> Attachments: SOLR-8668-part1.patch, SOLR-8668-part1.patch
>
>
> Following SOLR-8621, we should remove support for {{<mergePolicy>}} (and
> related {{<mergeFactor>}} and {{<maxMergeDocs>}}) in trunk/6x.
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