001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.master.procedure;
019
020import static org.junit.Assert.assertTrue;
021
022import java.io.IOException;
023import org.apache.hadoop.hbase.HBaseClassTestRule;
024import org.apache.hadoop.hbase.HBaseTestingUtility;
025import org.apache.hadoop.hbase.TableName;
026import org.apache.hadoop.hbase.client.RegionInfo;
027import org.apache.hadoop.hbase.master.RegionState.State;
028import org.apache.hadoop.hbase.master.ServerManager;
029import org.apache.hadoop.hbase.master.assignment.AssignmentManager;
030import org.apache.hadoop.hbase.master.assignment.RegionStates.RegionStateNode;
031import org.apache.hadoop.hbase.procedure2.ProcedureExecutor;
032import org.apache.hadoop.hbase.testclassification.MasterTests;
033import org.apache.hadoop.hbase.testclassification.MediumTests;
034import org.apache.hadoop.hbase.util.Bytes;
035import org.junit.AfterClass;
036import org.junit.BeforeClass;
037import org.junit.ClassRule;
038import org.junit.Test;
039import org.junit.experimental.categories.Category;
040import org.slf4j.Logger;
041import org.slf4j.LoggerFactory;
042
043import org.apache.hadoop.hbase.shaded.protobuf.generated.ProcedureProtos.ProcedureState;
044
045/**
046 * Confirm that we will do backoff when retrying on reopening table regions, to avoid consuming all
047 * the CPUs.
048 */
049@Category({ MasterTests.class, MediumTests.class })
050public class TestReopenTableRegionsProcedureBackoff {
051
052  @ClassRule
053  public static final HBaseClassTestRule CLASS_RULE =
054    HBaseClassTestRule.forClass(TestReopenTableRegionsProcedureBackoff.class);
055
056  private static final Logger LOG =
057    LoggerFactory.getLogger(TestReopenTableRegionsProcedureBackoff.class);
058
059  private static final HBaseTestingUtility UTIL = new HBaseTestingUtility();
060
061  private static TableName TABLE_NAME = TableName.valueOf("Backoff");
062
063  private static byte[] CF = Bytes.toBytes("cf");
064
065  @BeforeClass
066  public static void setUp() throws Exception {
067    UTIL.getConfiguration().setInt(ServerManager.WAIT_ON_REGIONSERVERS_MINTOSTART, 1);
068    UTIL.startMiniCluster(1);
069    UTIL.createTable(TABLE_NAME, CF);
070  }
071
072  @AfterClass
073  public static void tearDown() throws Exception {
074    UTIL.shutdownMiniCluster();
075  }
076
077  @Test
078  public void testRetryBackoff() throws IOException, InterruptedException {
079    AssignmentManager am = UTIL.getMiniHBaseCluster().getMaster().getAssignmentManager();
080    ProcedureExecutor<MasterProcedureEnv> procExec =
081      UTIL.getMiniHBaseCluster().getMaster().getMasterProcedureExecutor();
082    RegionInfo regionInfo = UTIL.getAdmin().getRegions(TABLE_NAME).get(0);
083    RegionStateNode regionNode = am.getRegionStates().getRegionStateNode(regionInfo);
084    long openSeqNum;
085    synchronized (regionNode) {
086      openSeqNum = regionNode.getOpenSeqNum();
087      // make a fake state to let the procedure wait.
088      regionNode.setState(State.OPENING);
089      regionNode.setOpenSeqNum(-1L);
090    }
091    ReopenTableRegionsProcedure proc = new ReopenTableRegionsProcedure(TABLE_NAME);
092    procExec.submitProcedure(proc);
093    UTIL.waitFor(10000, () -> proc.getState() == ProcedureState.WAITING_TIMEOUT);
094    long oldTimeout = 0;
095    int timeoutIncrements = 0;
096    for (;;) {
097      long timeout = proc.getTimeout();
098      if (timeout > oldTimeout) {
099        LOG.info("Timeout incremented, was {}, now is {}, increments={}", timeout, oldTimeout,
100          timeoutIncrements);
101        oldTimeout = timeout;
102        timeoutIncrements++;
103        if (timeoutIncrements > 3) {
104          // If we incremented at least twice, break; the backoff is working.
105          break;
106        }
107      }
108      Thread.sleep(1000);
109    }
110    synchronized (regionNode) {
111      // reset to the correct state
112      regionNode.setState(State.OPEN);
113      regionNode.setOpenSeqNum(openSeqNum);
114    }
115    ProcedureSyncWait.waitForProcedureToComplete(procExec, proc, 60000);
116    assertTrue(regionNode.getOpenSeqNum() > openSeqNum);
117  }
118}