David Smiley created SOLR-12999:
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Summary: Index replication could delete segments first
Key: SOLR-12999
URL: https://issues.apache.org/jira/browse/SOLR-12999
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: replication (java)
Reporter: David Smiley
Index replication could optionally delete files that it knows will not be
needed _first_. This would reduce disk capacity requirements of Solr, and it
would reduce some disk fragmentation when space get tight.
Solr (IndexFetcher) already grabs the remote file list, and it could see which
files it has locally, then delete the others. Today it asks Lucene to
{{deleteUnusedFiles}} at the end. This new mode would only be useful if there
is no SolrIndexSearcher open, since it would prevent the removal of files.
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