Jan H√łydahl resolved SOLR-8931.
    Resolution: Duplicate

> SolrCloud RebalanceShards API
> -----------------------------
>                 Key: SOLR-8931
>                 URL: https://issues.apache.org/jira/browse/SOLR-8931
>             Project: Solr
>          Issue Type: Wish
>          Components: SolrCloud
>            Reporter: olivier soyez
>            Priority: Minor
>              Labels: patch
>             Fix For: 6.0
>         Attachments: SOLR-8931.patch
> It would be great to have RebalanceShards action in SolrCloud, such like 
> described in this post by Suruchi Shah : 
> "http://engineering.bloomreach.com/solrcloud-rebalance-api/";
> By the way, in order to rebalance shards from a collection with 
> replicationFactor > 1, one idea could be to split some shards using the 
> rule-based replica placement.
> Since https://issues.apache.org/jira/browse/SOLR-8728 jira issue, splitShard 
> is using rule-based replica placement (for the "replication" replicas).
> As part of a proof of concept, the attached patch introduce a new action to 
> the collections API, named "REBALANCESHARDS", to rebalance some or all shards 
> among solrCloud nodes using splitShard.
> After each splitShard, a deleteshard of the inactive parent shard is done.
> One mandatory parameter:
> - collection: the name of the collection
> Two parameters:
> - deltaMaxFromAverage (default: 20): use to select n shards (<= half of all 
> shards) to be split, whose number of docs are greater than 
> deltaMaxFromAverage percent of the average number of docs per shard
> - force (default: false): if true, in case of none shards selected with the 
> deltaMaxFromAverage given, all shards of the collection will be selected to 
> be split
> Use example:
> curl 
> 'http://ip:port/solr/admin/collections?action=REBALANCESHARDS&collection=collection1&async=2&deltaMaxFromAverage=30'
> Drawbacks: replicationFactor must be more than one, select shards based on 
> the average number of docs per shard is not suitable for all cases

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