com.datastax.oss.driver.internal.core.channel.ClusterNameMismatchException Maven / Gradle / Ivy
/*
* Copyright DataStax, Inc.
*
* Licensed 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 com.datastax.oss.driver.internal.core.channel;
import com.datastax.oss.driver.api.core.metadata.EndPoint;
/**
* Indicates that we've attempted to connect to a node with a cluster name that doesn't match that
* of the other nodes known to the driver.
*
* The driver runs the following query on each newly established connection:
*
*
* select cluster_name from system.local
*
*
* The first connection sets the cluster name for this driver instance, all subsequent connections
* must match it or they will get rejected. This is intended to filter out errors in the discovery
* process (for example, stale entries in {@code system.peers}).
*
* This error is never returned directly to the client. If we detect a mismatch, it will always
* be after the driver has connected successfully; the error will be logged and the offending node
* forced down.
*/
public class ClusterNameMismatchException extends RuntimeException {
private static final long serialVersionUID = 0;
public final EndPoint endPoint;
public final String expectedClusterName;
public final String actualClusterName;
public ClusterNameMismatchException(
EndPoint endPoint, String actualClusterName, String expectedClusterName) {
super(
String.format(
"Node %s reports cluster name '%s' that doesn't match our cluster name '%s'. "
+ "It will be forced down.",
endPoint, actualClusterName, expectedClusterName));
this.endPoint = endPoint;
this.expectedClusterName = expectedClusterName;
this.actualClusterName = actualClusterName;
}
}