[jira] [Commented] (SOLR-8931) SolrCloud RebalanceShards API

["Mark Miller (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-8931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15221752#comment-15221752 ] 

Mark Miller commented on SOLR-8931:
-----------------------------------

Nice patch, this would be a good feature to add.

> 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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