0.90/src/test/java/org/apache/hadoop/hbase/client/TestTimestampsFilter.java

/**
 * Copyright 2009 The Apache Software Foundation
 *
 * 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.client;

import static org.junit.Assert.*;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.filter.TimestampsFilter;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

/**
 * Run tests related to {@link TimestampsFilter} using HBase client APIs.
 * Sets up the HBase mini cluster once at start. Each creates a table
 * named for the method and does its stuff against that.
 */
public class TestTimestampsFilter {
  final Log LOG = LogFactory.getLog(getClass());
  private final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();

  /**
   * @throws java.lang.Exception
   */
  @BeforeClass
  public static void setUpBeforeClass() throws Exception {
    TEST_UTIL.startMiniCluster(3);
  }

  /**
   * @throws java.lang.Exception
   */
  @AfterClass
  public static void tearDownAfterClass() throws Exception {
    TEST_UTIL.shutdownMiniCluster();
  }

  /**
   * @throws java.lang.Exception
   */
  @Before
  public void setUp() throws Exception {
    // Nothing to do.
  }

  /**
   * @throws java.lang.Exception
   */
  @After
  public void tearDown() throws Exception {
    // Nothing to do.
  }

  /**
   * Test from client side for TimestampsFilter.
   *
   * The TimestampsFilter provides the ability to request cells (KeyValues)
   * whose timestamp/version is in the specified list of timestamps/version.
   *
   * @throws Exception
   */
  @Test
  public void testTimestampsFilter() throws Exception {
    byte [] TABLE = Bytes.toBytes("testTimestampsFilter");
    byte [] FAMILY = Bytes.toBytes("event_log");
    byte [][] FAMILIES = new byte[][] { FAMILY };
    KeyValue kvs[];

    // create table; set versions to max...
    HTable ht = TEST_UTIL.createTable(TABLE, FAMILIES, Integer.MAX_VALUE);

    for (int rowIdx = 0; rowIdx < 5; rowIdx++) {
      for (int colIdx = 0; colIdx < 5; colIdx++) {
        // insert versions 201..300
        putNVersions(ht, FAMILY, rowIdx, colIdx, 201, 300);
        // insert versions 1..100
        putNVersions(ht, FAMILY, rowIdx, colIdx, 1, 100);
      }
    }

    // do some verification before flush
    verifyInsertedValues(ht, FAMILY);

    flush();

    // do some verification after flush
    verifyInsertedValues(ht, FAMILY);

    // Insert some more versions after flush. These should be in memstore.
    // After this we should have data in both memstore & HFiles.
    for (int rowIdx = 0; rowIdx < 5; rowIdx++) {
      for (int colIdx = 0; colIdx < 5; colIdx++) {
        putNVersions(ht, FAMILY, rowIdx, colIdx, 301, 400);
        putNVersions(ht, FAMILY, rowIdx, colIdx, 101, 200);
      }
    }

    for (int rowIdx = 0; rowIdx < 5; rowIdx++) {
      for (int colIdx = 0; colIdx < 5; colIdx++) {
        kvs = getNVersions(ht, FAMILY, rowIdx, colIdx,
                           Arrays.asList(505L, 5L, 105L, 305L, 205L));
        assertEquals(4, kvs.length);
        checkOneCell(kvs[0], FAMILY, rowIdx, colIdx, 305);
        checkOneCell(kvs[1], FAMILY, rowIdx, colIdx, 205);
        checkOneCell(kvs[2], FAMILY, rowIdx, colIdx, 105);
        checkOneCell(kvs[3], FAMILY, rowIdx, colIdx, 5);
      }
    }

    // Request an empty list of versions using the Timestamps filter;
    // Should return none.
    kvs = getNVersions(ht, FAMILY, 2, 2, new ArrayList<Long>());
    assertEquals(0, kvs.length);

    //
    // Test the filter using a Scan operation
    // Scan rows 0..4. For each row, get all its columns, but only
    // those versions of the columns with the specified timestamps.
    Result[] results = scanNVersions(ht, FAMILY, 0, 4,
                                     Arrays.asList(6L, 106L, 306L));
    assertEquals("# of rows returned from scan", 5, results.length);
    for (int rowIdx = 0; rowIdx < 5; rowIdx++) {
      kvs = results[rowIdx].raw();
      // each row should have 5 columns.
      // And we have requested 3 versions for each.
      assertEquals("Number of KeyValues in result for row:" + rowIdx,
                   3*5, kvs.length);
      for (int colIdx = 0; colIdx < 5; colIdx++) {
        int offset = colIdx * 3;
        checkOneCell(kvs[offset + 0], FAMILY, rowIdx, colIdx, 306);
        checkOneCell(kvs[offset + 1], FAMILY, rowIdx, colIdx, 106);
        checkOneCell(kvs[offset + 2], FAMILY, rowIdx, colIdx, 6);
      }
    }
  }

  /**
   * Test TimestampsFilter in the presence of version deletes.
   *
   * @throws Exception
   */
  @Test
  public void testWithVersionDeletes() throws Exception {

    // first test from memstore (without flushing).
    testWithVersionDeletes(false);

    // run same test against HFiles (by forcing a flush).
    testWithVersionDeletes(true);
  }

  private void testWithVersionDeletes(boolean flushTables) throws IOException {
    byte [] TABLE = Bytes.toBytes("testWithVersionDeletes_" +
                                   (flushTables ? "flush" : "noflush")); 
    byte [] FAMILY = Bytes.toBytes("event_log");
    byte [][] FAMILIES = new byte[][] { FAMILY };

    // create table; set versions to max...
    HTable ht = TEST_UTIL.createTable(TABLE, FAMILIES, Integer.MAX_VALUE);

    // For row:0, col:0: insert versions 1 through 5.
    putNVersions(ht, FAMILY, 0, 0, 1, 5);

    // delete version 4.
    deleteOneVersion(ht, FAMILY, 0, 0, 4);

    if (flushTables) {
      flush();
    }

    // request a bunch of versions including the deleted version. We should
    // only get back entries for the versions that exist.
    KeyValue kvs[] = getNVersions(ht, FAMILY, 0, 0, Arrays.asList(2L, 3L, 4L, 5L));
    assertEquals(3, kvs.length);
    checkOneCell(kvs[0], FAMILY, 0, 0, 5);
    checkOneCell(kvs[1], FAMILY, 0, 0, 3);
    checkOneCell(kvs[2], FAMILY, 0, 0, 2);
  }

  private void verifyInsertedValues(HTable ht, byte[] cf) throws IOException {
    for (int rowIdx = 0; rowIdx < 5; rowIdx++) {
      for (int colIdx = 0; colIdx < 5; colIdx++) {
        // ask for versions that exist.
        KeyValue[] kvs = getNVersions(ht, cf, rowIdx, colIdx,
                                      Arrays.asList(5L, 300L, 6L, 80L));
        assertEquals(4, kvs.length);
        checkOneCell(kvs[0], cf, rowIdx, colIdx, 300);
        checkOneCell(kvs[1], cf, rowIdx, colIdx, 80);
        checkOneCell(kvs[2], cf, rowIdx, colIdx, 6);
        checkOneCell(kvs[3], cf, rowIdx, colIdx, 5);

        // ask for versions that do not exist.
        kvs = getNVersions(ht, cf, rowIdx, colIdx,
                           Arrays.asList(101L, 102L));
        assertEquals(0, kvs.length);

        // ask for some versions that exist and some that do not.
        kvs = getNVersions(ht, cf, rowIdx, colIdx,
                           Arrays.asList(1L, 300L, 105L, 70L, 115L));
        assertEquals(3, kvs.length);
        checkOneCell(kvs[0], cf, rowIdx, colIdx, 300);
        checkOneCell(kvs[1], cf, rowIdx, colIdx, 70);
        checkOneCell(kvs[2], cf, rowIdx, colIdx, 1);
      }
    }
  }

  // Flush tables. Since flushing is asynchronous, sleep for a bit.
  private void flush() throws IOException {
    TEST_UTIL.flush();
    try {
      Thread.sleep(3000);
    } catch (InterruptedException i) {
      // ignore
    }
  }

  /**
   * Assert that the passed in KeyValue has expected contents for the
   * specified row, column & timestamp.
   */
  private void checkOneCell(KeyValue kv, byte[] cf,
                             int rowIdx, int colIdx, long ts) {

    String ctx = "rowIdx=" + rowIdx + "; colIdx=" + colIdx + "; ts=" + ts;

    assertEquals("Row mismatch which checking: " + ctx,
                 "row:"+ rowIdx, Bytes.toString(kv.getRow()));

    assertEquals("ColumnFamily mismatch while checking: " + ctx,
                 Bytes.toString(cf), Bytes.toString(kv.getFamily()));

    assertEquals("Column qualifier mismatch while checking: " + ctx,
                 "column:" + colIdx,
                  Bytes.toString(kv.getQualifier()));

    assertEquals("Timestamp mismatch while checking: " + ctx,
                 ts, kv.getTimestamp());

    assertEquals("Value mismatch while checking: " + ctx,
                 "value-version-" + ts, Bytes.toString(kv.getValue()));
  }

  /**
   * Uses the TimestampFilter on a Get to request a specified list of
   * versions for the row/column specified by rowIdx & colIdx.
   *
   */
  private  KeyValue[] getNVersions(HTable ht, byte[] cf, int rowIdx,
                                   int colIdx, List<Long> versions)
    throws IOException {
    byte row[] = Bytes.toBytes("row:" + rowIdx);
    byte column[] = Bytes.toBytes("column:" + colIdx);
    Filter filter = new TimestampsFilter(versions);
    Get get = new Get(row);
    get.addColumn(cf, column);
    get.setFilter(filter);
    get.setMaxVersions();
    Result result = ht.get(get);

    return result.raw();
  }

  /**
   * Uses the TimestampFilter on a Scan to request a specified list of
   * versions for the rows from startRowIdx to endRowIdx (both inclusive).
   */
  private Result[] scanNVersions(HTable ht, byte[] cf, int startRowIdx,
                                 int endRowIdx, List<Long> versions)
    throws IOException {
    byte startRow[] = Bytes.toBytes("row:" + startRowIdx);
    byte endRow[] = Bytes.toBytes("row:" + endRowIdx + 1); // exclusive
    Filter filter = new TimestampsFilter(versions);
    Scan scan = new Scan(startRow, endRow);
    scan.setFilter(filter);
    scan.setMaxVersions();
    ResultScanner scanner = ht.getScanner(scan);
    return scanner.next(endRowIdx - startRowIdx + 1);
  }

  /**
   * Insert in specific row/column versions with timestamps
   * versionStart..versionEnd.
   */
  private void putNVersions(HTable ht, byte[] cf, int rowIdx, int colIdx,
                            long versionStart, long versionEnd)
      throws IOException {
    byte row[] = Bytes.toBytes("row:" + rowIdx);
    byte column[] = Bytes.toBytes("column:" + colIdx);
    Put put = new Put(row);

    for (long idx = versionStart; idx <= versionEnd; idx++) {
      put.add(cf, column, idx, Bytes.toBytes("value-version-" + idx));
    }

    ht.put(put);
  }

  /**
   * For row/column specified by rowIdx/colIdx, delete the cell
   * corresponding to the specified version.
   */
  private void deleteOneVersion(HTable ht, byte[] cf, int rowIdx,
                                int colIdx, long version)
    throws IOException {
    byte row[] = Bytes.toBytes("row:" + rowIdx);
    byte column[] = Bytes.toBytes("column:" + colIdx);
    Delete del = new Delete(row);
    del.deleteColumn(cf, column, version);
    ht.delete(del);
  }
}