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   * Licensed to the Apache Software Foundation (ASF) under one
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   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
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   *
   *     http://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.cassandra.distributed.test;
  
  import org.junit.Assert;
  import org.junit.Test;
  
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.api.IInvokableInstance;
  
  import static org.apache.cassandra.distributed.api.ConsistencyLevel.ALL;
  
  public class MetricsCountQueriesTest extends TestBaseImpl
  {
      @Test
      public void testMetricsCountQueries() throws Throwable
      {
          try (Cluster cluster = init(Cluster.create(2)))
          {
              cluster.schemaChange(withKeyspace("CREATE TABLE %s.tbl (pk int, ck int, v int, PRIMARY KEY (pk, ck))"));
              for (int i = 0; i < 100; i++)
                  cluster.coordinator(1).execute(withKeyspace("INSERT INTO %s.tbl (pk, ck, v) VALUES (?,?,?)"), ALL, i, i, i);
  
              long readCount1 = readCount(cluster.get(1));
              long readCount2 = readCount(cluster.get(2));
              for (int i = 0; i < 100; i++)
                  cluster.coordinator(1).execute(withKeyspace("SELECT * FROM %s.tbl WHERE pk = ? and ck = ?"), ALL, i, i);
  
              readCount1 = readCount(cluster.get(1)) - readCount1;
              readCount2 = readCount(cluster.get(2)) - readCount2;
              Assert.assertEquals(readCount1, readCount2);
              Assert.assertEquals(100, readCount1);
          }
      }
  
      private static long readCount(IInvokableInstance instance)
      {
          return instance.callOnInstance(() -> Keyspace.open(KEYSPACE).getColumnFamilyStore("tbl").metric.readLatency.latency.getCount());
      }
  }
  