com.datastax.driver.core.exceptions.BusyPoolException 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.driver.core.exceptions;
import com.datastax.driver.core.EndPoint;
import com.datastax.driver.core.HostDistance;
import com.datastax.driver.core.Statement;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.concurrent.TimeUnit;
/**
* Indicates that a connection pool has run out of available connections.
*
* This happens if the pool has no connections (for example if it's currently reconnecting to its
* host), or if all connections have reached their maximum number of in flight queries. The query
* will be retried on the next host in the {@link
* com.datastax.driver.core.policies.LoadBalancingPolicy#newQueryPlan(String, Statement) query
* plan}.
*
*
This exception is a symptom that the driver is experiencing a high workload. If it happens
* regularly on all hosts, you should consider tuning one (or a combination of) the following
* pooling options:
*
*
* - {@link com.datastax.driver.core.PoolingOptions#setMaxRequestsPerConnection(HostDistance,
* int)}: maximum number of requests per connection;
*
- {@link com.datastax.driver.core.PoolingOptions#setMaxConnectionsPerHost(HostDistance,
* int)}: maximum number of connections in the pool;
*
- {@link com.datastax.driver.core.PoolingOptions#setMaxQueueSize(int)}: maximum number of
* enqueued requests before this exception is thrown.
*
*/
public class BusyPoolException extends DriverException implements CoordinatorException {
private static final long serialVersionUID = 0;
private final EndPoint endPoint;
public BusyPoolException(EndPoint endPoint, int queueSize) {
this(endPoint, buildMessage(endPoint, queueSize), null);
}
public BusyPoolException(EndPoint endPoint, long timeout, TimeUnit unit) {
this(endPoint, buildMessage(endPoint, timeout, unit), null);
}
private BusyPoolException(EndPoint endPoint, String message, Throwable cause) {
super(message, cause);
this.endPoint = endPoint;
}
private static String buildMessage(EndPoint endPoint, int queueSize) {
return String.format(
"[%s] Pool is busy (no available connection and the queue has reached its max size %d)",
endPoint, queueSize);
}
private static String buildMessage(EndPoint endPoint, long timeout, TimeUnit unit) {
return String.format(
"[%s] Pool is busy (no available connection and timed out after %d %s)",
endPoint, timeout, unit);
}
@Override
public EndPoint getEndPoint() {
return endPoint;
}
@Override
@Deprecated
public InetSocketAddress getAddress() {
return (endPoint == null) ? null : endPoint.resolve();
}
@Override
@Deprecated
public InetAddress getHost() {
return (endPoint == null) ? null : endPoint.resolve().getAddress();
}
@Override
public BusyPoolException copy() {
return new BusyPoolException(endPoint, getMessage(), this);
}
}