Distributed Result Grouping Caveats

Grouping is supported distributed searches, with some caveats:

1)Currently group.func is not supported in any distributed searchers.

2)group.ngroups and group.facet require that all documents in each group must be co-located on the same shard in order for accurate counts to be returned.

Document routing via composite keys can be a useful solution in many situation.

Shards and Indexing Data in SolrCloud

Document Routing

1)compositeId

two levels of routing; shard_key/num!document_id;

2)implicit

ps.

Ingoring Commits from Client Applications in SolrCloud

openSearcher=false/true

softCommit/hardCommit