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https://issues.apache.org/jira/browse/SOLR-11823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16312798#comment-16312798
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Ansgar Wiechers commented on SOLR-11823:
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Addendum: The API also doesn't seem to recognize a "maxShardsPerNode" value of
-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
>
> 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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