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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  
20  package org.apache.hadoop.hbase.coprocessor;
21  
22  import java.io.IOException;
23  
24  import org.apache.hadoop.conf.Configuration;
25  import org.apache.hadoop.hbase.*;
26  import org.apache.hadoop.hbase.client.HTable;
27  import org.apache.hadoop.hbase.client.Put;
28  import org.apache.hadoop.hbase.client.Durability;
29  import org.apache.hadoop.hbase.regionserver.HRegionServer;
30  import org.apache.hadoop.hbase.util.Bytes;
31  import org.apache.hadoop.hbase.regionserver.wal.WALEdit;
32  import org.junit.AfterClass;
33  import org.junit.BeforeClass;
34  import org.junit.Test;
35  import org.junit.experimental.categories.Category;
36  
37  import static org.junit.Assert.*;
38  
39  /**
40   * Tests unhandled exceptions thrown by coprocessors running on regionserver.
41   * Expected result is that the region server will remove the buggy coprocessor from
42   * its set of coprocessors and throw a org.apache.hadoop.hbase.exceptions.DoNotRetryIOException
43   * back to the client.
44   * (HBASE-4014).
45   */
46  @Category(MediumTests.class)
47  public class TestRegionServerCoprocessorExceptionWithRemove {
48    public static class BuggyRegionObserver extends SimpleRegionObserver {
49      @SuppressWarnings("null")
50      @Override
51      public void prePut(final ObserverContext<RegionCoprocessorEnvironment> c,
52                         final Put put, final WALEdit edit,
53                         final Durability durability) {
54        String tableName =
55            c.getEnvironment().getRegion().getRegionInfo().getTable().getNameAsString();
56        if (tableName.equals("observed_table")) {
57          // Trigger a NPE to fail the coprocessor
58          Integer i = null;
59          i = i + 1;
60        }
61      }
62    }
63  
64    private static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
65  
66    @BeforeClass
67    public static void setupBeforeClass() throws Exception {
68      // set configure to indicate which cp should be loaded
69      Configuration conf = TEST_UTIL.getConfiguration();
70      conf.set(CoprocessorHost.REGION_COPROCESSOR_CONF_KEY,
71          BuggyRegionObserver.class.getName());
72      TEST_UTIL.getConfiguration().setBoolean(CoprocessorHost.ABORT_ON_ERROR_KEY, false);
73      TEST_UTIL.startMiniCluster();
74    }
75  
76    @AfterClass
77    public static void teardownAfterClass() throws Exception {
78      TEST_UTIL.shutdownMiniCluster();
79    }
80  
81    @Test(timeout=60000)
82    public void testExceptionFromCoprocessorDuringPut()
83        throws IOException, InterruptedException {
84      // Set watches on the zookeeper nodes for all of the regionservers in the
85      // cluster. When we try to write to TEST_TABLE, the buggy coprocessor will
86      // cause a NullPointerException, which will cause the regionserver (which
87      // hosts the region we attempted to write to) to abort. In turn, this will
88      // cause the nodeDeleted() method of the DeadRegionServer tracker to
89      // execute, which will set the rsZKNodeDeleted flag to true, which will
90      // pass this test.
91  
92      TableName TEST_TABLE =
93          TableName.valueOf("observed_table");
94      byte[] TEST_FAMILY = Bytes.toBytes("aaa");
95  
96      HTable table = TEST_UTIL.createTable(TEST_TABLE, TEST_FAMILY);
97      TEST_UTIL.createMultiRegions(table, TEST_FAMILY);
98      TEST_UTIL.waitUntilAllRegionsAssigned(TEST_TABLE);
99      // Note which regionServer that should survive the buggy coprocessor's
100     // prePut().
101     HRegionServer regionServer =
102         TEST_UTIL.getRSForFirstRegionInTable(TEST_TABLE);
103 
104     boolean threwIOE = false;
105     try {
106       final byte[] ROW = Bytes.toBytes("aaa");
107       Put put = new Put(ROW);
108       put.add(TEST_FAMILY, ROW, ROW);
109       table.put(put);
110       table.flushCommits();
111       // We may need two puts to reliably get an exception
112       table.put(put);
113       table.flushCommits();
114     } catch (IOException e) {
115       threwIOE = true;
116     } finally {
117       assertTrue("The regionserver should have thrown an exception", threwIOE);
118     }
119 
120     // Wait 10 seconds for the regionserver to abort: expected result is that
121     // it will survive and not abort.
122     for (int i = 0; i < 10; i++) {
123       assertFalse(regionServer.isAborted());
124       try {
125         Thread.sleep(1000);
126       } catch (InterruptedException e) {
127         fail("InterruptedException while waiting for regionserver " +
128             "zk node to be deleted.");
129       }
130     }
131     table.close();
132   }
133 
134 }
135