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1   /*
2   /**
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *     http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing, software
14   * distributed under the License is distributed on an "AS IS" BASIS,
15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16   * See the License for the specific language governing permissions and
17   * limitations under the License.
18   */
19  package org.apache.hadoop.hbase.exceptions;
20  
21  import org.apache.commons.logging.Log;
22  import org.apache.commons.logging.LogFactory;
23  import org.apache.hadoop.classification.InterfaceAudience;
24  import org.apache.hadoop.classification.InterfaceStability;
25  import org.apache.hadoop.hbase.NotServingRegionException;
26  import org.apache.hadoop.ipc.RemoteException;
27  
28  /**
29   * Subclass if the server knows the region is now on another server.
30   * This allows the client to call the new region server without calling the master.
31   */
32  @InterfaceAudience.Private
33  @InterfaceStability.Evolving
34  public class RegionOpeningException extends NotServingRegionException {
35    private static final Log LOG = LogFactory.getLog(RegionOpeningException.class);
36    private static final long serialVersionUID = -7232903522310558395L;
37  
38    public RegionOpeningException(String message) {
39      super(message);
40    }
41  
42    /**
43     * Look for a RegionOpeningException in the exception:
44     *  - hadoop.ipc wrapped exceptions
45     *  - nested exceptions
46     * Returns null if we didn't find the exception.
47     * TODO: this code is mostly C/Ped from RegionMovedExecption. Due to the limitations of
48     *       generics it's not amenable to generalizing without adding parameters/isAssignableFrom.
49     *       Might make general if used in more places.
50     */
51    public static RegionOpeningException find(Object exception) {
52      if (exception == null || !(exception instanceof Throwable)) {
53        return null;
54      }
55      RegionOpeningException res = null;
56      Throwable cur = (Throwable)exception;
57      while (res == null && cur != null) {
58        if (cur instanceof RegionOpeningException) {
59          res = (RegionOpeningException) cur;
60        } else {
61          if (cur instanceof RemoteException) {
62            RemoteException re = (RemoteException) cur;
63            Exception e = re.unwrapRemoteException(RegionOpeningException.class);
64            if (e == null) {
65              e = re.unwrapRemoteException();
66            }
67            // unwrapRemoteException can return the exception given as a parameter when it cannot
68            //  unwrap it. In this case, there is no need to look further
69            // noinspection ObjectEquality
70            if (e != re) {
71              res = find(e);
72            }
73          }
74          cur = cur.getCause();
75        }
76      }
77      return res;
78    }
79  }