SolrCloud and Shard Splitting

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Shard Splitting and Document Routing in SolrCloud

http://www.slideshare.net/shalinmangar/solr-cloud-shardsplitting

http://www.slideshare.net/thelabdude/tjp-solr-webinar#

Document Routing: Custom Hashing

http://searchhub.org/2013/06/13/solr-cloud-document-routing/ numShards=4 router=compositeId

id = BigCo!doc5

q=my_query&shard.keys=BigCo!

Co-locate documents



SolrCloud Collections API

/admin/collections?action=CREATE|DELETE|RELOAD|CREATE&name=mycollection



Each shard is assigned a hash range

Each shard also has a state which defaults to 'ACTIVE'

Seamless on-the-fly splitting – no downtime required

● Retried on failures

● /admin/collections?

action=SPLITSHARD&collection=mycollection

– &shard=shardId

● A lower-level CoreAdmin API comes free!

– /admin/cores?action=SPLIT&core=core0&targetCore=core1&targetCore=core2

– /admin/cores?action=SPLIT&core=core0&path=/path/to/index/1&path=/path/to/index/2





https://issues.apache.org/jira/browse/SOLR-4816

1) Document routing: Updates are routed directly to the correct shard leader eliminating document routing at the server.

2) Optional parallel update execution: Updates for each shard are executed in a separate thread so parallel indexing can occur across the cluster.



https://issues.apache.org/jira/browse/SOLR-3076

Solr(Cloud) should support block joins





https://issues.apache.org/jira/browse/SOLR-5025

Implement true re-sharding for SolrCloud ==Unresolved



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