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https://issues.apache.org/jira/browse/SOLR-8931?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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olivier soyez updated SOLR-8931:
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Attachment: SOLR-8931.patch
> 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: trunk
>
> 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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