hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRequestsPerSecondMetric.java

   1 /**
   2  * Licensed to the Apache Software Foundation (ASF) under one
   3  * or more contributor license agreements.  See the NOTICE file
   4  * distributed with this work for additional information
   5  * regarding copyright ownership.  The ASF licenses this file
   6  * to you under the Apache License, Version 2.0 (the
   7  * "License"); you may not use this file except in compliance
   8  * with the License.  You may obtain a copy of the License at
   9  * http://www.apache.org/licenses/LICENSE-2.0
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.apache.hadoop.hbase.regionserver;
  17
  18
  19 import java.io.IOException;
  20 import org.apache.hadoop.conf.Configuration;
  21 import org.apache.hadoop.hbase.HBaseClassTestRule;
  22 import org.apache.hadoop.hbase.HBaseTestingUtil;
  23 import org.apache.hadoop.hbase.HConstants;
  24 import org.apache.hadoop.hbase.ServerName;
  25 import org.apache.hadoop.hbase.TableName;
  26 import org.apache.hadoop.hbase.client.Admin;
  27 import org.apache.hadoop.hbase.client.Table;
  28 import org.apache.hadoop.hbase.testclassification.MediumTests;
  29 import org.apache.hadoop.hbase.testclassification.RegionServerTests;
  30 import org.junit.AfterClass;
  31 import org.junit.Assert;
  32 import org.junit.BeforeClass;
  33 import org.junit.ClassRule;
  34 import org.junit.Test;
  35 import org.junit.experimental.categories.Category;
  36
  37 /**
  38  * Validate requestsPerSecond metric.
  39  */
  40 @Category({ RegionServerTests.class, MediumTests.class })
  41 public class TestRequestsPerSecondMetric {
  42
  43   @ClassRule
  44   public static final HBaseClassTestRule CLASS_RULE =
  45       HBaseClassTestRule.forClass(TestRequestsPerSecondMetric.class);
  46
  47   private static final HBaseTestingUtil UTIL = new HBaseTestingUtil();
  48   private static final long METRICS_PERIOD = 2000L;
  49   private static Configuration conf;
  50
  51
  52   @BeforeClass
  53   public static void setup() throws Exception {
  54     conf = UTIL.getConfiguration();
  55     conf.setLong(HConstants.REGIONSERVER_METRICS_PERIOD, METRICS_PERIOD);
  56     UTIL.startMiniCluster(1);
  57   }
  58
  59   @AfterClass
  60   public static void teardown() throws Exception {
  61     UTIL.shutdownMiniCluster();
  62   }
  63
  64
  65   @Test
  66   /**
  67    * This test will confirm no negative value in requestsPerSecond metric during any region
  68    * transition(close region/remove region/move region).
  69    * Firstly, load 2000 random rows for 25 regions and will trigger a metric.
  70    * Now, metricCache will have a current read and write requests count.
  71    * Next, we disable a table and all of its 25 regions will be closed.
  72    * As part of region close, his metric will also be removed from metricCache.
  73    * prior to HBASE-23237, we do not remove/reset his metric so we incorrectly compute
  74    * (currentRequestCount - lastRequestCount) which result into negative value.
  75    *
  76    * @throws IOException
  77    * @throws InterruptedException
  78    */
  79   public void testNoNegativeSignAtRequestsPerSecond() throws IOException, InterruptedException {
  80     final TableName TABLENAME = TableName.valueOf("t");
  81     final String FAMILY = "f";
  82     Admin admin = UTIL.getAdmin();
  83     UTIL.createMultiRegionTable(TABLENAME, FAMILY.getBytes(),25);
  84     Table table = admin.getConnection().getTable(TABLENAME);
  85     ServerName serverName = admin.getRegionServers().iterator().next();
  86     HRegionServer regionServer = UTIL.getMiniHBaseCluster().getRegionServer(serverName);
  87     MetricsRegionServerWrapperImpl metricsWrapper  =
  88         new MetricsRegionServerWrapperImpl(regionServer);
  89     MetricsRegionServerWrapperImpl.RegionServerMetricsWrapperRunnable metricsServer
  90         = metricsWrapper.new RegionServerMetricsWrapperRunnable();
  91     metricsServer.run();
  92     UTIL.loadRandomRows(table, FAMILY.getBytes(), 1, 2000);
  93     Thread.sleep(METRICS_PERIOD);
  94     metricsServer.run();
  95     admin.disableTable(TABLENAME);
  96     Thread.sleep(METRICS_PERIOD);
  97     metricsServer.run();
  98     Assert.assertTrue(metricsWrapper.getRequestsPerSecond() > -1);
  99   }
 100 }