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Server functionality for HBase

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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.hbase.master.procedure;

import org.apache.hadoop.hbase.ServerName;
import org.apache.yetus.audience.InterfaceAudience;

/**
 * Procedures that handle servers -- e.g. server crash -- must implement this Interface. It is used
 * by the procedure runner to figure locking and what queuing.
 */
@InterfaceAudience.Private
public interface ServerProcedureInterface {
  public enum ServerOperationType {
    CRASH_HANDLER,
    SWITCH_RPC_THROTTLE,

    /**
     * help find a available region server as worker and release worker after task done invoke
     * SPLIT_WAL_REMOTE operation to send real WAL splitting request to worker manage the split wal
     * task flow, will retry if SPLIT_WAL_REMOTE failed
     */
    SPLIT_WAL,

    /**
     * send the split WAL request to region server and handle the response
     */
    SPLIT_WAL_REMOTE,

    /**
     * Get all the replication queues of a crash server and assign them to other region servers
     */
    CLAIM_REPLICATION_QUEUES,

    /**
     * send the claim replication queue request to region server to actually assign it
     */
    CLAIM_REPLICATION_QUEUE_REMOTE,

    /**
     * send verify snapshot request to region server and handle the response
     */
    VERIFY_SNAPSHOT
  }

  /** Returns Name of this server instance. */
  ServerName getServerName();

  /** Returns True if this server has an hbase:meta table region. */
  boolean hasMetaTableRegion();

  /**
   * Given an operation type we can take decisions about what to do with pending operations. e.g. if
   * we get a crash handler and we have some assignment operation pending we can abort those
   * operations.
   * @return the operation type that the procedure is executing.
   */
  ServerOperationType getServerOperationType();
}