Package org.apache.solr.cluster

package org.apache.solr.cluster

This package contains the interfaces giving access to cluster state, including nodes, collections and the structure of the collections (shards and replicas). These interfaces allow separating external code contribution from the internal Solr implementations of these concepts to make usage simpler and to not require changes to external contributed code every time the internal abstractions are modified.

The top level abstraction is Cluster. The cluster is composed of Nodes. Indexes are stored in SolrCollections, composed of Shards whose actual copies on Nodes are called Replicas.

Related Packages

Package	Description
org.apache.solr	Commonly reused classes and interfaces (deprecated package, do not add new classes)
org.apache.solr.cluster.events	Interfaces defining support for cluster-level event generation and processing.
org.apache.solr.cluster.maintenance	Cluster Singleton plugins that are used to perform maintenance tasks within the cluster.
org.apache.solr.cluster.placement	This package contains interfaces visible by plugins (i.e.

Class	Description
Cluster	A representation of the SolrCloud cluster state, providing information on which nodes and collections are part of the cluster and a way to get to more detailed info.
Node	Representation of a SolrCloud node or server in the SolrCloud cluster.
Replica	An instantiation (or one of the copies) of a given Shard of a given SolrCollection.
Replica.ReplicaState
Replica.ReplicaType	The order of this enum is important from the most to least "important" replica type.
Shard	Shard in a SolrCollection, i.e.
Shard.ShardState
SolrCollection	Represents a Collection in SolrCloud (unrelated to Collection that uses the nicer name).