hbase-server/src/test/java/org/apache/hadoop/hbase/filter/TestFilterWithScanLimits.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hbase.filter;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CompareOperator;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.testclassification.FilterTests;
import org.apache.hadoop.hbase.testclassification.LargeTests;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.BeforeClass;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Test if Filter is incompatible with scan-limits
 */
@Category({FilterTests.class, LargeTests.class})
public class TestFilterWithScanLimits extends FilterTestingCluster {

  @ClassRule
  public static final HBaseClassTestRule CLASS_RULE =
      HBaseClassTestRule.forClass(TestFilterWithScanLimits.class);

  private static final Logger LOG = LoggerFactory
      .getLogger(TestFilterWithScanLimits.class);

  private static final TableName tableName = TableName.valueOf("scanWithLimit");
  private static final String columnFamily = "f1";

  @Test
  public void testScanWithLimit() {
    int kv_number = 0;
    try {
      Scan scan = new Scan();
      // set batch number as 2, which means each Result should contain 2 KVs at most
      scan.setBatch(2);
      SingleColumnValueFilter filter = new SingleColumnValueFilter(
          Bytes.toBytes(columnFamily), Bytes.toBytes("c5"),
      CompareOperator .EQUAL, new SubstringComparator("2_c5"));

      // add filter after batch defined
      scan.setFilter(filter);
      Table table = openTable(tableName);
      ResultScanner scanner = table.getScanner(scan);
      // Expect to get following row
      // row2 => <f1:c1, 2_c1>, <f1:c2, 2_c2>,
      // row2 => <f1:c3, 2_c3>, <f1:c4, 2_c4>,
      // row2 => <f1:c5, 2_c5>

      for (Result result : scanner) {
        for (Cell kv : result.listCells()) {
          kv_number++;
          LOG.debug(kv_number + ". kv: " + kv);
        }
      }

      scanner.close();
      table.close();
    } catch (Exception e) {
      // no correct result is expected
      assertNotNull("No IncompatibleFilterException catched", e);
    }
    LOG.debug("check the fetched kv number");
    assertEquals("We should not get result(s) returned.", 0, kv_number);
  }

  @BeforeClass
  public static void prepareData() {
    try {
      createTable(tableName, columnFamily);
      Table table = openTable(tableName);
      List<Put> puts = new ArrayList<>();

      // row1 => <f1:c1, 1_c1>, <f1:c2, 1_c2>, <f1:c3, 1_c3>, <f1:c4,1_c4>,
      // <f1:c5, 1_c5>
      // row2 => <f1:c1, 2_c1>, <f1:c2, 2_c2>, <f1:c3, 2_c3>, <f1:c4,2_c4>,
      // <f1:c5, 2_c5>
      for (int i = 1; i < 4; i++) {
        Put put = new Put(Bytes.toBytes("row" + i));
        for (int j = 1; j < 6; j++) {
          put.addColumn(Bytes.toBytes("f1"), Bytes.toBytes("c" + j), Bytes.toBytes(i + "_c" + j));
        }
        puts.add(put);
      }

      table.put(puts);
      table.close();
    } catch (IOException e) {
      assertNull("Exception found while putting data into table", e);
    }
  }

}