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ClusterStopper.java
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ClusterStopper.java
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/*
* Copyright 2009 LinkedIn, 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 voldemort.utils;
/**
* ClusterStopper represents the operation of remotely stopping a set of
* Voldemort servers. The operation is <b>not</b> to stop/halt/shutdown the
* remote hosts themselves.
*
* <p/>
*
* Implementation notes:
*
* <ol>
* <li>Implementations must provide a reasonable guarantee that the servers were
* actually stopped. An error should be raised, therefore, if the server could
* not be stopped, regardless of cause.
* <li>However, if the server was not already running, no error should be
* raised. The application logic should simply continue unaffected. It is up to
* the implementation to decide the means in which this may be reported, if any.
* <li>It is assumed that the remote host is properly set up to stop the
* Voldemort server. This means that:
* <ul>
* <li>The Java environment is properly configured with $JAVA_HOME pointing at a
* valid JDK.
* <li>The Voldemort distribution is already present at a known location on the
* remote host.
* </ul>
* <li>The shutdown procedure should occur in parallel against the remote hosts,
* if possible.
* </ol>
*
*/
public interface ClusterStopper extends RemoteOperation {
}