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https://issues.apache.org/jira/browse/SOLR-11823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16389666#comment-16389666
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Daniel commented on SOLR-11823:
-------------------------------

Same problem here on Solr 7.2.1.

> Incorrect number of replica calculation when using Restore Collection API
> -------------------------------------------------------------------------
>
>                 Key: SOLR-11823
>                 URL: https://issues.apache.org/jira/browse/SOLR-11823
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: Backup/Restore
>    Affects Versions: 7.1
>            Reporter: Ansgar Wiechers
>            Priority: Major
>
> I'm running Solr 7.1 (didn't test other versions) in SolrCloud mode ona a 
> 3-node cluster and tried using the backup/restore API for the first time. 
> Backup worked fine, but when trying to restore the backed-up collection I ran 
> into an unexpected problem with the replication factor setting.
> I expected the command below to restore a backup of the collection "demo" 
> with 3 shards, creating 2 replicas per shard. Instead it's trying to create 6 
> replicas per shard:
> {noformat}
> # curl -s -k 
> 'https://localhost:8983/solr/admin/collections?action=restore&name=demo&location=/srv/backup/solr/solr-dev&collection=demo&maxShardsPerNode=2&replicationFactor=2'
> {
>   "error": {
>     "code": 400,
>     "msg": "Solr cloud with available number of nodes:3 is insufficient for 
> restoring a collection with 3 shards, total replicas per shard 6 and 
> maxShardsPerNode 2. Consider increasing maxShardsPerNode value OR number 
> ofavailable nodes.",
>     "metadata": [
>       "error-class",
>       "org.apache.solr.common.SolrException",
>       "root-error-class",
>       "org.apache.solr.common.SolrException"
>     ]
>   },
>   "exception": {
>     "rspCode": 400,
>     "msg": "Solr cloud with available number of nodes:3 is insufficient for 
> restoring a collection with 3 shards, total replicas per shard 6 and 
> maxShardsPerNode 2. Consider increasing maxShardsPerNode value OR number of 
> available nodes."
>   },
>   "Operation restore caused exception:": 
> "org.apache.solr.common.SolrException:org.apache.solr.common.SolrException: 
> Solr cloud with available number of nodes:3 is insufficient for restoring a 
> collection with 3 shards, total replicas per shard 6 and maxShardsPerNode 2. 
> Consider increasing maxShardsPerNode value OR number of available nodes.",
>   "responseHeader": {
>     "QTime": 28,
>     "status": 400
>   }
> }
> {noformat}
> Restoring a collection with only 2 shards tries to create 6 replicas as well, 
> so it looks to me like the restore API multiplies the replication factor with 
> the number of nodes, which is not how the replication factor behaves in other 
> contexts. The 
> [documentation|https://lucene.apache.org/solr/guide/7_1/collections-api.html] 
> also didn't lead me to expect this behavior:
> {quote}
> replicationFactor
>    The number of replicas to be created for each shard.
> {quote}



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