olivier soyez created SOLR-8931:
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Summary: 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
Fix For: trunk
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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