[jira] [Created] (SOLR-7820) IndexFetcher should delete the current index directory before downloading the new index when isFullCopyNeeded==true

["Timothy Potter (JIRA)" <ji...@apache.org>]

Timothy Potter created SOLR-7820:
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             Summary: IndexFetcher should delete the current index directory before downloading the new index when isFullCopyNeeded==true
                 Key: SOLR-7820
                 URL: https://issues.apache.org/jira/browse/SOLR-7820
             Project: Solr
          Issue Type: Improvement
          Components: replication (java)
            Reporter: Timothy Potter


When a replica is trying to recover and it's IndexFetcher decides it needs to pull the full index from a peer (isFullCopyNeeded == true), then the existing index directory should be deleted before the full copy is started to free up disk to pull a fresh index, otherwise the server will potentially need 2x the disk space (old + incoming new). Currently, the IndexFetcher removes the index directory after the new is downloaded; however, once the fetcher decides a full copy is needed, what is the value of the existing index? It's clearly out-of-date and should not serve queries. Since we're deleting data preemptively, maybe this should be an advanced configuration property, only to be used by those that are disk-space constrained (which I'm seeing more and more with people deploying high-end SSDs - they typically don't have 2x the disk capacity required by an index).



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