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https://issues.apache.org/jira/browse/SOLR-6326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14136293#comment-14136293
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Steve Rowe commented on SOLR-6326:
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Actually, looking at {{DirectUpdateHandler2.commit()}}, "postCommit" listeners
are called regardless of whether a commit was actually performed, so a new
"preCommit" event type isn't necessary. {{ExternalFileFieldReloader}} could
override {{AbstractSolrEventListener.postCommit()}} and handle reloading there.
There is no support currently for registering "postSoftCommit" event listeners
in the solrconfig.xml {{<updateHandler>}} section, so I think that'd have to be
added, along with {{ExternalFileFieldReloader}} overriding
{{AbstractSolrEventListener.postSoftCommit()}}, to provide the same
functionality as the current "newSearcher" listener. The "firstListener"
callback would still be necessary, since no (soft) commit will have happened on
startup.
> ExternalFileFieldReloader and commits
> -------------------------------------
>
> Key: SOLR-6326
> URL: https://issues.apache.org/jira/browse/SOLR-6326
> Project: Solr
> Issue Type: Bug
> Reporter: Peter Keegan
> Labels: difficulty-medium, externalfilefield, impact-medium
>
> When there are multiple 'external file field' files available, Solr will
> reload the last one (lexicographically) with a commit, but only if changes
> were made to the index. Otherwise, it skips the reload and logs: "No
> uncommitted changes. Skipping IW.commit."
> IndexWriter.hasUncommittedChanges() returns false, but new external files
> should be reloaded with commits.
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