org.apache.solr.common.cloud

Interface CollectionStateWatcher

public interface CollectionStateWatcher

Callback registered with ZkStateReader.registerCollectionStateWatcher(String, CollectionStateWatcher) and called whenever there is a change in the collection state or in the list of liveNodes.

See Also:

DocCollectionWatcher

Method Summary

Modifier and Type	Method and Description
boolean	onStateChanged(Set<String> liveNodes, DocCollection collectionState) Called when either the collection we are registered against has a change of state or there is a change to the live nodes of our collection.

Method Detail

onStateChanged

boolean onStateChanged(Set<String> liveNodes,
                       DocCollection collectionState)

Called when either the collection we are registered against has a change of state or there is a change to the live nodes of our collection.

Note that, due to the way Zookeeper watchers are implemented, a single call may be the result of several state changes. Also, multiple calls to this method can be made with the same state, ie. without any new updates.

Parameters:

liveNodes - the set of live nodes

collectionState - the new collection state (may be null if the collection has been deleted)

Returns:

true if the watcher should be removed