com.datastax.oss.driver.api.core.NodeUnavailableException Maven / Gradle / Ivy
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* 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 com.datastax.oss.driver.api.core;
import com.datastax.oss.driver.api.core.metadata.Node;
import edu.umd.cs.findbugs.annotations.NonNull;
import java.util.Objects;
/**
* Indicates that a {@link Node} was selected in a query plan, but it had no connection available.
*
* A common reason to encounter this error is when the configured number of connections per node
* and requests per connection is not high enough to absorb the overall request rate. This can be
* mitigated by tuning the following options:
*
*
* - {@code advanced.connection.pool.local.size};
*
- {@code advanced.connection.pool.remote.size};
*
- {@code advanced.connection.max-requests-per-connection}.
*
*
* See {@code reference.conf} for more details.
*
* Another possibility is when you are trying to direct a request {@linkplain
* com.datastax.oss.driver.api.core.cql.Statement#setNode(Node) to a particular node}, but that node
* has no connections available.
*/
public class NodeUnavailableException extends DriverException {
private final Node node;
public NodeUnavailableException(Node node) {
super("No connection was available to " + node, null, null, true);
this.node = Objects.requireNonNull(node);
}
@NonNull
public Node getNode() {
return node;
}
@Override
@NonNull
public DriverException copy() {
return new NodeUnavailableException(node);
}
}