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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.locator;
import java.util.Set;
import org.apache.cassandra.utils.FBUtilities;
/**
* This interface helps determine location of node in the datacenter relative to another node.
* Give a node A and another node B it can tell if A and B are on the same rack or in the same
* datacenter.
*/
public interface IEndpointSnitch
{
/**
* returns a String representing the rack the given endpoint belongs to
*/
public String getRack(InetAddressAndPort endpoint);
/**
* returns a String representing the rack current endpoint belongs to
*/
default public String getLocalRack()
{
return getRack(FBUtilities.getBroadcastAddressAndPort());
}
/**
* returns a String representing the datacenter the given endpoint belongs to
*/
public String getDatacenter(InetAddressAndPort endpoint);
/**
* returns a String representing the datacenter current endpoint belongs to
*/
default public String getLocalDatacenter()
{
return getDatacenter(FBUtilities.getBroadcastAddressAndPort());
}
default public String getDatacenter(Replica replica)
{
return getDatacenter(replica.endpoint());
}
/**
* returns a new List sorted by proximity to the given endpoint
*/
public > C sortedByProximity(final InetAddressAndPort address, C addresses);
/**
* compares two endpoints in relation to the target endpoint, returning as Comparator.compare would
*/
public int compareEndpoints(InetAddressAndPort target, Replica r1, Replica r2);
/**
* called after Gossiper instance exists immediately before it starts gossiping
*/
public void gossiperStarting();
/**
* Returns whether for a range query doing a query against merged is likely
* to be faster than 2 sequential queries, one against l1 followed by one against l2.
*/
public boolean isWorthMergingForRangeQuery(ReplicaCollection> merged, ReplicaCollection> l1, ReplicaCollection> l2);
/**
* Determine if the datacenter or rack values in the current node's snitch conflict with those passed in parameters.
*/
default boolean validate(Set datacenters, Set racks)
{
return true;
}
}
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