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https://issues.apache.org/jira/browse/SOLR-1807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12842369#action_12842369
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Shalin Shekhar Mangar commented on SOLR-1807:
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UpdateHandler is an interface so instead of adding a method to it and breaking
compatibility, we added it to the DirectUpdateHandler2 class. I guess the only
way is to change the UpdateHandler interface.
> UpdateHandler plugin is not fully supported
> -------------------------------------------
>
> Key: SOLR-1807
> URL: https://issues.apache.org/jira/browse/SOLR-1807
> Project: Solr
> Issue Type: Bug
> Components: update
> Affects Versions: 1.4
> Reporter: John Wang
>
> UpdateHandler is published as a supported Plugin, but code such as the
> following:
> if (core.getUpdateHandler() instanceof DirectUpdateHandler2) {
> ((DirectUpdateHandler2)
> core.getUpdateHandler()).forceOpenWriter();
> } else {
> LOG.warn("The update handler being used is not an instance or
> sub-class of DirectUpdateHandler2. " +
> "Replicate on Startup cannot work.");
> }
> suggest that it is really not fully supported.
> Must all implementations of UpdateHandler be subclasses of
> DirectUpdateHandler2 for it to work with replication?
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