| Package | Description | 
|---|---|
| org.apache.solr.cloud | Classes for dealing with ZooKeeper when operating in SolrCloud mode. | 
| org.apache.solr.cloud.overseer | Classes for updating cluster state in SolrCloud mode. | 
| org.apache.solr.core | Core classes implementing Solr internals and the management of  SolrCores | 
| org.apache.solr.handler | Concrete implementations of  SolrRequestHandler | 
| org.apache.solr.schema | IndexSchemaandFieldTypeimplementations for powering schema.xml | 
| org.apache.solr.update | APIs and classes for managing index updates | 
| Class and Description | 
|---|
| ActionThrottle.NanoTimeSource | 
| CloudDescriptor | 
| CurrentCoreDescriptorProvider Provide the current list of registered  CoreDescriptors. | 
| DistributedMap A distributed map. | 
| DistributedQueue A distributed queue. | 
| ElectionContext | 
| LeaderElector Leader Election process. | 
| LockTree.Session | 
| Overseer Cluster leader. | 
| Overseer.FailedOp | 
| Overseer.Stat | 
| Overseer.Stats Used to hold statistics about overseer operations. | 
| OverseerMessageHandler Interface for processing messages received by an  OverseerTaskProcessor | 
| OverseerMessageHandler.Lock | 
| OverseerNodePrioritizer Responsible for prioritization of Overseer nodes, for example with the
 ADDROLE collection command. | 
| OverseerTaskProcessor A generic processor run in the Overseer, used for handling items added
 to a distributed work queue. | 
| OverseerTaskProcessor.OverseerMessageHandlerSelector An interface to determine which  OverseerMessageHandlerhandles a given message. | 
| OverseerTaskProcessor.TaskBatch | 
| OverseerTaskQueue A  DistributedQueueaugmented with helper methods specific to the overseer task queues. | 
| OverseerTaskQueue.QueueEvent | 
| RecoveryStrategy.RecoveryListener | 
| ZkController Handle ZooKeeper interactions. | 
| ZkSolrResourceLoader ResourceLoader that works with ZooKeeper. | 
| Class and Description | 
|---|
| Overseer.Stats Used to hold statistics about overseer operations. | 
| Class and Description | 
|---|
| CloudDescriptor | 
| ZkController Handle ZooKeeper interactions. | 
| ZkSolrResourceLoader ResourceLoader that works with ZooKeeper. | 
| Class and Description | 
|---|
| ZkController Handle ZooKeeper interactions. | 
| Class and Description | 
|---|
| ZkController Handle ZooKeeper interactions. | 
| Class and Description | 
|---|
| ActionThrottle | 
| RecoveryStrategy.RecoveryListener | 
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