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HADOOP-7455. HA: Introduce HA Service Protocol Interface. Contributed by Suresh Srinivas. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-1623@1154063 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Suresh Srinivas 2011-08-05 01:34:32 +00:00
parent bed3495263
commit 9145ab5887
4 changed files with 185 additions and 0 deletions
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2
hadoop-common/CHANGES.txt
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@ -63,6 +63,8 @@ Trunk (unreleased changes)
HADOOP-6385. dfs should support -rmdir (was HDFS-639). (Daryn Sharp
via mattf)
HADOOP-7455. HA: Introduce HA Service Protocol Interface. (suresh)
IMPROVEMENTS
HADOOP-7042. Updates to test-patch.sh to include failed test names and

72
hadoop-common/src/main/java/org/apache/hadoop/ha/HAServiceProtocol.java Normal file
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@ -0,0 +1,72 @@
/**
* 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.hadoop.ha;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.ipc.VersionedProtocol;
/**
* Protocol interface that provides High Availability related primitives to
* monitor and fail-over the service.
*
* This interface could be used by HA frameworks to manage the service.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface HAServiceProtocol extends VersionedProtocol {
/**
* Initial version of the protocol
*/
public static final long versionID = 1L;
/**
* Monitor the health of service. This periodically called by the HA
* frameworks to monitor the health of the service.
*
* Service is expected to perform checks to ensure it is functional.
* If the service is not healthy due to failure or partial failure,
* it is expected to throw {@link HealthCheckFailedException}.
* The definition of service not healthy is left to the service.
*
* Note that when health check of an Active service fails,
* failover to standby may be done.
*
* @throws HealthCheckFailedException
* if the health check of a service fails.
*/
public void monitorHealth() throws HealthCheckFailedException;
/**
* Request service to transition to active state. No operation, if the
* service is already in active state.
*
* @throws ServiceFailedException
* if transition from standby to active fails.
*/
public void transitionToActive() throws ServiceFailedException;
/**
* Request service to transition to standby state. No operation, if the
* service is already in standby state.
*
* @throws ServiceFailedException
* if transition from active to standby fails.
*/
public void transitionToStandby() throws ServiceFailedException;
}

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hadoop-common/src/main/java/org/apache/hadoop/ha/HealthCheckFailedException.java Normal file
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@ -0,0 +1,55 @@
/**
* 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.hadoop.ha;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* Exception thrown to indicate that health check of a service
* failed.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class HealthCheckFailedException extends Exception {
private static final long serialVersionUID = 1L;
/**
* Constructs exception with the specified detail message.
* @param message the detail message (which is saved for later retrieval
* by the {@link #getMessage()} method).
*/
public HealthCheckFailedException(final String message) {
super(message);
}
/**
* Constructs a new exception with the specified detail message and
* cause.
*
* @param message the detail message (which is saved for later retrieval
* by the {@link #getMessage()} method).
* @param cause the cause (which is saved for later retrieval by the
* {@link #getCause()} method). (A <tt>null</tt> value is
* permitted, and indicates that the cause is nonexistent or
* unknown.)
*/
public HealthCheckFailedException(String message, Throwable cause) {
super(message, cause);
}
}

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hadoop-common/src/main/java/org/apache/hadoop/ha/ServiceFailedException.java Normal file
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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 org.apache.hadoop.ha;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* Exception thrown to indicate that an operation performed
* to modify the state of a service or application failed.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class ServiceFailedException extends Exception {
private static final long serialVersionUID = 1L;
/**
* Constructs exception with the specified detail message.
* @param message the detail message (which is saved for later retrieval
* by the {@link #getMessage()} method).
*/
public ServiceFailedException(final String message) {
super(message);
}
/**
* Constructs a new exception with the specified detail message and
* cause.
*
* @param message the detail message (which is saved for later retrieval
* by the {@link #getMessage()} method).
* @param cause the cause (which is saved for later retrieval by the
* {@link #getCause()} method). (A <tt>null</tt> value is
* permitted, and indicates that the cause is nonexistent or
* unknown.)
*/
public ServiceFailedException(String message, Throwable cause) {
super(message, cause);
}
}