import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
/**
 * @param conf
 * @param family             Name of this store's column family
 * @param minVersions        Store's MIN_VERSIONS setting
 * @param maxVersions        Store's VERSIONS setting
 * @param ttl                Store's TTL (in ms)
 * @param timeToPurgeDeletes duration in ms after which a delete marker can
 *                           be purged during a major compaction.
 * @param keepDeletedCells   Store's keepDeletedCells setting
 * @param comparator         The store's comparator
 */
public ScanInfo(final Configuration conf, final byte[] family, final int minVersions,
    final int maxVersions, final long ttl, final KeepDeletedCells keepDeletedCells,
    final long timeToPurgeDeletes, final KVComparator comparator) {
  this.family = family;
  this.minVersions = minVersions;
  this.maxVersions = maxVersions;
  this.ttl = ttl;
  this.keepDeletedCells = keepDeletedCells;
  this.timeToPurgeDeletes = timeToPurgeDeletes;
  this.comparator = comparator;
  this.tableMaxRowSize =
      conf.getLong(HConstants.TABLE_MAX_ROWSIZE_KEY, HConstants.TABLE_MAX_ROWSIZE_DEFAULT);
  this.usePread = conf.getBoolean("hbase.storescanner.use.pread", false);
  long perHeartbeat = conf.getLong(StoreScanner.HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK,
      StoreScanner.DEFAULT_HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK);
  this.cellsPerTimeoutCheck = perHeartbeat > 0 ?
      perHeartbeat :
      StoreScanner.DEFAULT_HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK;
  this.parallelSeekEnabled =
      conf.getBoolean(StoreScanner.STORESCANNER_PARALLEL_SEEK_ENABLE, false);
  this.conf = conf;
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
/**
 * The ExplicitColumnTracker does not support "raw" scanning.
 */
@Test
public void testRawScanWithColumns() throws Exception {
  HTableDescriptor htd = hbu.createTableDescriptor(name.getMethodName(), 0, 3,
      HConstants.FOREVER, KeepDeletedCells.TRUE);
  HRegion region = hbu.createLocalHRegion(htd, null, null);

  Scan s = new Scan();
  s.setRaw(true);
  s.setMaxVersions();
  s.addColumn(c0, c0);

  try {
    region.getScanner(s);
    fail("raw scanner with columns should have failed");
  } catch (org.apache.hadoop.hbase.DoNotRetryIOException dnre) {
    // ok!
  }

  HRegion.closeHRegion(region);
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
private void testDropDeletes(
    byte[] from, byte[] to, byte[][] rows, MatchCode... expected) throws IOException {
  long now = EnvironmentEdgeManager.currentTime();
  // Set time to purge deletes to negative value to avoid it ever happening.
  ScanInfo scanInfo = new ScanInfo(fam2, 0, 1, ttl, KeepDeletedCells.FALSE, -1L, rowComparator);
  NavigableSet<byte[]> cols = get.getFamilyMap().get(fam2);

  ScanQueryMatcher qm = new ScanQueryMatcher(scan, scanInfo, cols, Long.MAX_VALUE,
      HConstants.OLDEST_TIMESTAMP, HConstants.OLDEST_TIMESTAMP, now, from, to, null);
  List<ScanQueryMatcher.MatchCode> actual =
      new ArrayList<ScanQueryMatcher.MatchCode>(rows.length);
  byte[] prevRow = null;
  for (byte[] row : rows) {
    if (prevRow == null || !Bytes.equals(prevRow, row)) {
      qm.setRow(row, 0, (short)row.length);
      prevRow = row;
    }
    actual.add(qm.match(new KeyValue(row, fam2, null, now, Type.Delete)));
  }

  assertEquals(expected.length, actual.size());
  for (int i = 0; i < expected.length; i++) {
    if (PRINT) System.out.println("expected " + expected[i] + ", actual " + actual.get(i));
    assertEquals(expected[i], actual.get(i));
  }
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
protected final MatchCode tryDropDelete(Cell cell) {
  long timestamp = cell.getTimestamp();
  // If it is not the time to drop the delete marker, just return
  if (timeToPurgeDeletes > 0 && now - timestamp <= timeToPurgeDeletes) {
    return MatchCode.INCLUDE;
  }
  if (keepDeletedCells == KeepDeletedCells.TRUE
      || (keepDeletedCells == KeepDeletedCells.TTL && timestamp >= oldestUnexpiredTS)) {
    // If keepDeletedCell is true, or the delete marker is not expired yet, we should include it
    // in version counting to see if we can drop it. The only exception is that, we can make
    // sure that no put is older than this delete marker. And under this situation, all later
    // cells of this column(must be delete markers) can be skipped.
    if (timestamp < earliestPutTs) {
      return columns.getNextRowOrNextColumn(cell);
    } else {
      return null;
    }
  } else {
    return MatchCode.SKIP;
  }
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
private ScanInfo(byte[] family, int minVersions, int maxVersions, long ttl,
    KeepDeletedCells keepDeletedCells, long timeToPurgeDeletes, CellComparator comparator,
    long tableMaxRowSize, boolean usePread, long cellsPerTimeoutCheck,
    boolean parallelSeekEnabled, long preadMaxBytes, boolean newVersionBehavior) {
  this.family = family;
  this.minVersions = minVersions;
  this.maxVersions = maxVersions;
  this.ttl = ttl;
  this.keepDeletedCells = keepDeletedCells;
  this.timeToPurgeDeletes = timeToPurgeDeletes;
  this.comparator = comparator;
  this.tableMaxRowSize = tableMaxRowSize;
  this.usePread = usePread;
  this.cellsPerTimeoutCheck = cellsPerTimeoutCheck;
  this.parallelSeekEnabled = parallelSeekEnabled;
  this.preadMaxBytes = preadMaxBytes;
  this.newVersionBehavior = newVersionBehavior;
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
/**
 * The ExplicitColumnTracker does not support "raw" scanning.
 */
@Test
public void testRawScanWithColumns() throws Exception {
  HTableDescriptor htd = hbu.createTableDescriptor(name.getMethodName(), 0, 3,
      HConstants.FOREVER, KeepDeletedCells.TRUE);
  Region region = hbu.createLocalHRegion(htd, null, null);

  Scan s = new Scan();
  s.setRaw(true);
  s.setMaxVersions();
  s.addColumn(c0, c0);

  try {
    region.getScanner(s);
    fail("raw scanner with columns should have failed");
  } catch (org.apache.hadoop.hbase.DoNotRetryIOException dnre) {
    // ok!
  }

  HBaseTestingUtility.closeRegionAndWAL(region);
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
private void testDropDeletes(byte[] from, byte[] to, byte[][] rows, MatchCode... expected)
    throws IOException {
  long now = EnvironmentEdgeManager.currentTime();
  // Set time to purge deletes to negative value to avoid it ever happening.
  ScanInfo scanInfo = new ScanInfo(this.conf, fam2, 0, 1, ttl, KeepDeletedCells.FALSE,
      HConstants.DEFAULT_BLOCKSIZE, -1L, rowComparator, false);

  CompactionScanQueryMatcher qm = CompactionScanQueryMatcher.create(scanInfo,
    ScanType.COMPACT_RETAIN_DELETES, Long.MAX_VALUE, HConstants.OLDEST_TIMESTAMP,
    HConstants.OLDEST_TIMESTAMP, now, from, to, null);
  List<ScanQueryMatcher.MatchCode> actual = new ArrayList<>(rows.length);
  byte[] prevRow = null;
  for (byte[] row : rows) {
    if (prevRow == null || !Bytes.equals(prevRow, row)) {
      qm.setToNewRow(KeyValueUtil.createFirstOnRow(row));
      prevRow = row;
    }
    actual.add(qm.match(new KeyValue(row, fam2, null, now, Type.Delete)));
  }

  assertEquals(expected.length, actual.size());
  for (int i = 0; i < expected.length; i++) {
    LOG.debug("expected " + expected[i] + ", actual " + actual.get(i));
    assertEquals(expected[i], actual.get(i));
  }
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
/**
 * Ensure that expired delete family markers don't override valid puts
 */
@Test
public void testExpiredDeleteFamily() throws Exception {
  long now = System.currentTimeMillis();
  KeyValue[] kvs = new KeyValue[] {
      new KeyValue(Bytes.toBytes("R1"), Bytes.toBytes("cf"), null, now-1000,
          KeyValue.Type.DeleteFamily),
      create("R1", "cf", "a", now-10, KeyValue.Type.Put,
          "dont-care"),
  };
  List<KeyValueScanner> scanners = scanFixture(kvs);
  Scan scan = new Scan();
  scan.readVersions(1);
  // scanner with ttl equal to 500
  ScanInfo scanInfo = new ScanInfo(CONF, CF, 0, 1, 500, KeepDeletedCells.FALSE,
      HConstants.DEFAULT_BLOCKSIZE, 0, CellComparator.getInstance(), false);
  try (StoreScanner scanner = new StoreScanner(scan, scanInfo, null, scanners)) {
    List<Cell> results = new ArrayList<>();
    assertEquals(true, scanner.next(results));
    assertEquals(1, results.size());
    assertEquals(kvs[1], results.get(0));
    results.clear();

    assertEquals(false, scanner.next(results));
  }
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
private void _testMatch_ExplicitColumns(Scan scan, List<MatchCode> expected) throws IOException {
  long now = EnvironmentEdgeManager.currentTime();
  // 2,4,5
  ScanQueryMatcher qm = new ScanQueryMatcher(scan, new ScanInfo(this.conf, fam2,
      0, 1, ttl, KeepDeletedCells.FALSE, 0, rowComparator), get.getFamilyMap().get(fam2),
      now - ttl, now);

  List<KeyValue> memstore = new ArrayList<KeyValue>();
  memstore.add(new KeyValue(row1, fam2, col1, 1, data));
  memstore.add(new KeyValue(row1, fam2, col2, 1, data));
  memstore.add(new KeyValue(row1, fam2, col3, 1, data));
  memstore.add(new KeyValue(row1, fam2, col4, 1, data));
  memstore.add(new KeyValue(row1, fam2, col5, 1, data));

  memstore.add(new KeyValue(row2, fam1, col1, data));

  List<ScanQueryMatcher.MatchCode> actual = new ArrayList<ScanQueryMatcher.MatchCode>();
  KeyValue k = memstore.get(0);
  qm.setRow(k.getRowArray(), k.getRowOffset(), k.getRowLength());

  for (KeyValue kv : memstore){
    actual.add(qm.match(kv));
  }

  assertEquals(expected.size(), actual.size());
  for(int i=0; i< expected.size(); i++){
    assertEquals(expected.get(i), actual.get(i));
    if(PRINT){
      System.out.println("expected "+expected.get(i)+
          ", actual " +actual.get(i));
    }
  }
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
private void testDropDeletes(
    byte[] from, byte[] to, byte[][] rows, MatchCode... expected) throws IOException {
  long now = EnvironmentEdgeManager.currentTime();
  // Set time to purge deletes to negative value to avoid it ever happening.
  ScanInfo scanInfo =
    new ScanInfo(this.conf, fam2, 0, 1, ttl, KeepDeletedCells.FALSE, -1L, rowComparator);
  NavigableSet<byte[]> cols = get.getFamilyMap().get(fam2);

  ScanQueryMatcher qm = new ScanQueryMatcher(scan, scanInfo, cols, Long.MAX_VALUE,
      HConstants.OLDEST_TIMESTAMP, HConstants.OLDEST_TIMESTAMP, now, from, to, null);
  List<ScanQueryMatcher.MatchCode> actual =
      new ArrayList<ScanQueryMatcher.MatchCode>(rows.length);
  byte[] prevRow = null;
  for (byte[] row : rows) {
    if (prevRow == null || !Bytes.equals(prevRow, row)) {
      qm.setRow(row, 0, (short)row.length);
      prevRow = row;
    }
    actual.add(qm.match(new KeyValue(row, fam2, null, now, Type.Delete)));
  }

  assertEquals(expected.length, actual.size());
  for (int i = 0; i < expected.length; i++) {
    if (PRINT) System.out.println("expected " + expected[i] + ", actual " + actual.get(i));
    assertEquals(expected[i], actual.get(i));
  }
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
public void testWildCardTtlScan() throws IOException {
  long now = System.currentTimeMillis();
  KeyValue [] kvs = new KeyValue[] {
      KeyValueTestUtil.create("R1", "cf", "a", now-1000, KeyValue.Type.Put, "dont-care"),
      KeyValueTestUtil.create("R1", "cf", "b", now-10, KeyValue.Type.Put, "dont-care"),
      KeyValueTestUtil.create("R1", "cf", "c", now-200, KeyValue.Type.Put, "dont-care"),
      KeyValueTestUtil.create("R1", "cf", "d", now-10000, KeyValue.Type.Put, "dont-care"),
      KeyValueTestUtil.create("R2", "cf", "a", now, KeyValue.Type.Put, "dont-care"),
      KeyValueTestUtil.create("R2", "cf", "b", now-10, KeyValue.Type.Put, "dont-care"),
      KeyValueTestUtil.create("R2", "cf", "c", now-200, KeyValue.Type.Put, "dont-care"),
      KeyValueTestUtil.create("R2", "cf", "c", now-1000, KeyValue.Type.Put, "dont-care")
  };
  List<KeyValueScanner> scanners = scanFixture(kvs);
  Scan scan = new Scan();
  scan.setMaxVersions(1);
  ScanInfo scanInfo = new ScanInfo(CONF, CF, 0, 1, 500, KeepDeletedCells.FALSE, 0,
      KeyValue.COMPARATOR);
  ScanType scanType = ScanType.USER_SCAN;
  StoreScanner scanner =
    new StoreScanner(scan, scanInfo, scanType,
        null, scanners);

  List<Cell> results = new ArrayList<Cell>();
  assertEquals(true, scanner.next(results));
  assertEquals(2, results.size());
  assertEquals(kvs[1], results.get(0));
  assertEquals(kvs[2], results.get(1));
  results.clear();

  assertEquals(true, scanner.next(results));
  assertEquals(3, results.size());
  assertEquals(kvs[4], results.get(0));
  assertEquals(kvs[5], results.get(1));
  assertEquals(kvs[6], results.get(2));
  results.clear();

  assertEquals(false, scanner.next(results));
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
/**
 * Ensure that expired delete family markers don't override valid puts
 */
public void testExpiredDeleteFamily() throws Exception {
  long now = System.currentTimeMillis();
  KeyValue [] kvs = new KeyValue[] {
      new KeyValue(Bytes.toBytes("R1"), Bytes.toBytes("cf"), null, now-1000,
          KeyValue.Type.DeleteFamily),
      KeyValueTestUtil.create("R1", "cf", "a", now-10, KeyValue.Type.Put,
          "dont-care"),
  };
  List<KeyValueScanner> scanners = scanFixture(kvs);
  Scan scan = new Scan();
  scan.setMaxVersions(1);
  // scanner with ttl equal to 500
  ScanInfo scanInfo = new ScanInfo(CONF, CF, 0, 1, 500, KeepDeletedCells.FALSE, 0,
      KeyValue.COMPARATOR);
  ScanType scanType = ScanType.USER_SCAN;
  StoreScanner scanner =
      new StoreScanner(scan, scanInfo, scanType, null, scanners);

  List<Cell> results = new ArrayList<Cell>();
  assertEquals(true, scanner.next(results));
  assertEquals(1, results.size());
  assertEquals(kvs[1], results.get(0));
  results.clear();

  assertEquals(false, scanner.next(results));
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
private static HColumnDescriptor createColumnFamily() {
    return new HColumnDescriptor(CF_NAME)
            .setMaxVersions(1)
            .setBlockCacheEnabled(true)
            .setBloomFilterType(BloomType.ROW)
            .setCompressionType(DEFAULT_COMPRESSION_ALGORITHM)
            .setDataBlockEncoding(DEFAULT_DATABLOCK_ENCODING)
            .setCacheBloomsOnWrite(true)
            .setCacheDataOnWrite(true)
            .setCacheIndexesOnWrite(true)
            .setKeepDeletedCells(KeepDeletedCells.FALSE)
            .setValue(HTableDescriptor.MAX_FILESIZE, REGION_MAX_FILESIZE)
            .setValue(HTableDescriptor.SPLIT_POLICY, REGION_SPLIT_POLICY);
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
/**
 * @param family Name of this store's column family
 * @param minVersions Store's MIN_VERSIONS setting
 * @param maxVersions Store's VERSIONS setting
 * @param ttl Store's TTL (in ms)
 * @param timeToPurgeDeletes duration in ms after which a delete marker can
 *        be purged during a major compaction.
 * @param keepDeletedCells Store's keepDeletedCells setting
 * @param comparator The store's comparator
 */
public ScanInfo(final byte[] family, final int minVersions, final int maxVersions,
    final long ttl, final KeepDeletedCells keepDeletedCells, final long timeToPurgeDeletes,
    final KVComparator comparator) {
  this.family = family;
  this.minVersions = minVersions;
  this.maxVersions = maxVersions;
  this.ttl = ttl;
  this.keepDeletedCells = keepDeletedCells;
  this.timeToPurgeDeletes = timeToPurgeDeletes;
  this.comparator = comparator;
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
/**
 * Verify that delete markers are removed from an otherwise empty store.
 */
@Test
public void testDeleteMarkerExpirationEmptyStore() throws Exception {
  HTableDescriptor htd = hbu.createTableDescriptor(name.getMethodName(), 0, 1,
      HConstants.FOREVER, KeepDeletedCells.TRUE);
  HRegion region = hbu.createLocalHRegion(htd, null, null);

  long ts = EnvironmentEdgeManager.currentTime();

  Delete d = new Delete(T1, ts);
  d.deleteColumns(c0, c0, ts);
  region.delete(d);

  d = new Delete(T1, ts);
  d.deleteFamily(c0);
  region.delete(d);

  d = new Delete(T1, ts);
  d.deleteColumn(c0, c0, ts+1);
  region.delete(d);

  d = new Delete(T1, ts);
  d.deleteColumn(c0, c0, ts+2);
  region.delete(d);

  // 1 family marker, 1 column marker, 2 version markers
  assertEquals(4, countDeleteMarkers(region));

  // neither flush nor minor compaction removes any marker
  region.flushcache();
  assertEquals(4, countDeleteMarkers(region));
  region.compactStores(false);
  assertEquals(4, countDeleteMarkers(region));

  // major compaction removes all, since there are no puts they affect
  region.compactStores(true);
  assertEquals(0, countDeleteMarkers(region));

  HRegion.closeHRegion(region);
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
private void _testMatch_ExplicitColumns(Scan scan, List<MatchCode> expected) throws IOException {
  long now = EnvironmentEdgeManager.currentTime();
  // 2,4,5
  ScanQueryMatcher qm = new ScanQueryMatcher(scan, new ScanInfo(fam2,
      0, 1, ttl, KeepDeletedCells.FALSE, 0, rowComparator), get.getFamilyMap().get(fam2),
      now - ttl, now);

  List<KeyValue> memstore = new ArrayList<KeyValue>();
  memstore.add(new KeyValue(row1, fam2, col1, 1, data));
  memstore.add(new KeyValue(row1, fam2, col2, 1, data));
  memstore.add(new KeyValue(row1, fam2, col3, 1, data));
  memstore.add(new KeyValue(row1, fam2, col4, 1, data));
  memstore.add(new KeyValue(row1, fam2, col5, 1, data));

  memstore.add(new KeyValue(row2, fam1, col1, data));

  List<ScanQueryMatcher.MatchCode> actual = new ArrayList<ScanQueryMatcher.MatchCode>();
  KeyValue k = memstore.get(0);
  qm.setRow(k.getRowArray(), k.getRowOffset(), k.getRowLength());

  for (KeyValue kv : memstore){
    actual.add(qm.match(kv));
  }

  assertEquals(expected.size(), actual.size());
  for(int i=0; i< expected.size(); i++){
    assertEquals(expected.get(i), actual.get(i));
    if(PRINT){
      System.out.println("expected "+expected.get(i)+
          ", actual " +actual.get(i));
    }
  }
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
public void testWildCardTtlScan() throws IOException {
  long now = System.currentTimeMillis();
  KeyValue [] kvs = new KeyValue[] {
      KeyValueTestUtil.create("R1", "cf", "a", now-1000, KeyValue.Type.Put, "dont-care"),
      KeyValueTestUtil.create("R1", "cf", "b", now-10, KeyValue.Type.Put, "dont-care"),
      KeyValueTestUtil.create("R1", "cf", "c", now-200, KeyValue.Type.Put, "dont-care"),
      KeyValueTestUtil.create("R1", "cf", "d", now-10000, KeyValue.Type.Put, "dont-care"),
      KeyValueTestUtil.create("R2", "cf", "a", now, KeyValue.Type.Put, "dont-care"),
      KeyValueTestUtil.create("R2", "cf", "b", now-10, KeyValue.Type.Put, "dont-care"),
      KeyValueTestUtil.create("R2", "cf", "c", now-200, KeyValue.Type.Put, "dont-care"),
      KeyValueTestUtil.create("R2", "cf", "c", now-1000, KeyValue.Type.Put, "dont-care")
  };
  List<KeyValueScanner> scanners = scanFixture(kvs);
  Scan scan = new Scan();
  scan.setMaxVersions(1);
  ScanInfo scanInfo = new ScanInfo(CF, 0, 1, 500, KeepDeletedCells.FALSE, 0,
      KeyValue.COMPARATOR);
  ScanType scanType = ScanType.USER_SCAN;
  StoreScanner scanner =
    new StoreScanner(scan, scanInfo, scanType,
        null, scanners);

  List<Cell> results = new ArrayList<Cell>();
  assertEquals(true, scanner.next(results));
  assertEquals(2, results.size());
  assertEquals(kvs[1], results.get(0));
  assertEquals(kvs[2], results.get(1));
  results.clear();

  assertEquals(true, scanner.next(results));
  assertEquals(3, results.size());
  assertEquals(kvs[4], results.get(0));
  assertEquals(kvs[5], results.get(1));
  assertEquals(kvs[6], results.get(2));
  results.clear();

  assertEquals(false, scanner.next(results));
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
/**
 * Ensure that expired delete family markers don't override valid puts
 */
public void testExpiredDeleteFamily() throws Exception {
  long now = System.currentTimeMillis();
  KeyValue [] kvs = new KeyValue[] {
      new KeyValue(Bytes.toBytes("R1"), Bytes.toBytes("cf"), null, now-1000,
          KeyValue.Type.DeleteFamily),
      KeyValueTestUtil.create("R1", "cf", "a", now-10, KeyValue.Type.Put,
          "dont-care"),
  };
  List<KeyValueScanner> scanners = scanFixture(kvs);
  Scan scan = new Scan();
  scan.setMaxVersions(1);
  // scanner with ttl equal to 500
  ScanInfo scanInfo = new ScanInfo(CF, 0, 1, 500, KeepDeletedCells.FALSE, 0,
      KeyValue.COMPARATOR);
  ScanType scanType = ScanType.USER_SCAN;
  StoreScanner scanner =
      new StoreScanner(scan, scanInfo, scanType, null, scanners);

  List<Cell> results = new ArrayList<Cell>();
  assertEquals(true, scanner.next(results));
  assertEquals(1, results.size());
  assertEquals(kvs[1], results.get(0));
  results.clear();

  assertEquals(false, scanner.next(results));
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
public static void main(String[] args) throws Exception {
	String quorum = "192.168.0.30,192.168.0.31,192.168.0.32";
	//quorum = "192.168.8.191,192.168.1.192,192.168.1.193";
	int port = 2181;
	String znode = "/hyperbase1";
	HBaseConnPool connPool = new HBaseClientManager(quorum, port, znode);
	HBaseDDLHandler ddlHandler = new HBaseDDLHandler(connPool);

	String tableName = "demo_test";
	System.out.println("=============================== : delete");
	ddlHandler.deleteTable(tableName);

	String columnFamily = "cf";
	System.out.println("=============================== : create");
	ddlHandler.createTable(tableName, columnFamily, "cf2");

	System.out.println("=============================== : desc");
	HBaseUtils.printTableInfo(ddlHandler.getTable(tableName));
	System.out.println("=============================== : alter");
	HBaseAdmin admin = new HBaseAdmin(connPool.getConn());
	admin.disableTable(tableName);
	HTableInterface htable = ddlHandler.getTable(tableName);
	HTableDescriptor tableDesc = admin.getTableDescriptor(htable.getTableName());
	tableDesc.removeFamily(Bytes.toBytes("cf2"));
	HColumnDescriptor newhcd = new HColumnDescriptor("cf3");
	newhcd.setMaxVersions(2);
	newhcd.setKeepDeletedCells(KeepDeletedCells.TRUE);
	tableDesc.addFamily(newhcd);

	admin.modifyTable(tableName, tableDesc);
	admin.enableTable(tableName);
	admin.close();

	System.out.println("=============================== : desc");
	HBaseUtils.printTableInfo(ddlHandler.getTable(tableName));
	System.out.println("=============================== : delete");
	ddlHandler.deleteTable(tableName);

	connPool.closeConn();
}
 

import org.apache.hadoop.hbase.KeepDeletedCells; //导入依赖的package包/类
protected NormalUserScanQueryMatcher(Scan scan, ScanInfo scanInfo, ColumnTracker columns,
    boolean hasNullColumn, DeleteTracker deletes, long oldestUnexpiredTS, long now) {
  super(scan, scanInfo, columns, hasNullColumn, oldestUnexpiredTS, now);
  this.deletes = deletes;
  this.get = scan.isGetScan();
  this.seePastDeleteMarkers = scanInfo.getKeepDeletedCells() != KeepDeletedCells.FALSE;
}