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https://issues.apache.org/jira/browse/SOLR-12999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16743575#comment-16743575
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Noble Paul commented on SOLR-12999:
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bq. Can you please clarify what you mean by "full replication"?
A full replication is performed when there are segments in master index with
same name but different size/checksum. It used to be less common in the past
with master-slave setup , but it's now very common with leader-replica setup in
SolrCloud.
bq.For example, we often found ourselves in situations where...
Well, in your case it has downloaded the entire leader index to a new directory
> 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
> Priority: Major
>
> 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 probably only be
> useful if there is no SolrIndexSearcher open, since it would prevent the
> removal of files.
> The motivating scenario is a SolrCloud replica that is going into full
> recovery. It ought to not be fielding searches. The code changes would not
> depend on SolrCloud though.
> This option would have some danger the user should be aware of. If the
> replication fails, leaving the local files incomplete/corrupt, the only
> recourse is to try full replication again. You can't just give up and field
> queries.
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