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https://issues.apache.org/jira/browse/SOLR-7172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14620340#comment-14620340
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Noble Paul commented on SOLR-7172:
----------------------------------

bq.It seems to me that nodeList is the wrong thing to be looking at as well, 
we've already collected a list of nodes we could put additional replicas on

Yes. your observation is correct. {{nodeNameVsShardCount}} has the appropriate 
nodes and it should be used to arrive at  {{maxCoresAllowedToCreate}}  

bq.How this interacts with rules is a mystery to me though

Rules actually ignores the {{maxShardsPerNode}} param. It totally relies on the 
rules to identify the nodes

While you are working on this please rename the class {{Node}} to something 
like {{ReplicaCount}} or whatever is suitable 

> addreplica API fails with incorrect error msg "cannot create collection"
> ------------------------------------------------------------------------
>
>                 Key: SOLR-7172
>                 URL: https://issues.apache.org/jira/browse/SOLR-7172
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>    Affects Versions: 4.10.3, 5.0
>            Reporter: Shalin Shekhar Mangar
>            Assignee: Shalin Shekhar Mangar
>             Fix For: 5.2, Trunk
>
>         Attachments: SOLR-7172.patch
>
>
> Steps to reproduce:
> # Create 1 node solr cloud cluster
> # Create collection 'test' with 
> numShards=1&replicationFactor=1&maxShardsPerNode=1
> # Call addreplica API:
> {code}
> http://localhost:8983/solr/admin/collections?action=addreplica&collection=test&shard=shard1&wt=json
>  
> {code}
> API fails with the following response:
> {code}
> {
> responseHeader: {
> status: 400,
> QTime: 9
> },
> Operation ADDREPLICA caused exception:: 
> "org.apache.solr.common.SolrException:org.apache.solr.common.SolrException: 
> Cannot create collection test. No live Solr-instances",
> exception: {
> msg: "Cannot create collection test. No live Solr-instances",
> rspCode: 400
> },
> error: {
> msg: "Cannot create collection test. No live Solr-instances",
> code: 400
> }
> }
> {code}



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