Package 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:

  • Method Summary

    Modifier and Type
    Method
    Description
    boolean
    onStateChanged(Set<String> liveNodes, org.apache.solr.common.cloud.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 Details

    • onStateChanged

      boolean onStateChanged(Set<String> liveNodes, org.apache.solr.common.cloud.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