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Common utilities shared in Alluxio core modules

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/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.master;

/**
 * Defines the grace mode of exclusive locking of the state-lock.
 */
public enum GraceMode {
  TIMEOUT,    // Timeout if lock can't be acquired by grace-cycle.
  FORCED,     // Force the lock if grace-cycle failed to acquire it.
}