Java Scan.isReversed方法代碼示例

import org.apache.hadoop.hbase.client.Scan; //導入方法依賴的package包/類
/**
 * Checks whether the given scan rowkey range overlaps with the current storefile's
 *
 * @param scan the scan specification. Used to determine the rowkey range.
 * @return true if there is overlap, false otherwise
 */
public boolean passesKeyRangeFilter(Scan scan) {
  if (this.getFirstKey() == null || this.getLastKey() == null) {
    // the file is empty
    return false;
  }
  if (Bytes.equals(scan.getStartRow(), HConstants.EMPTY_START_ROW) && Bytes
      .equals(scan.getStopRow(), HConstants.EMPTY_END_ROW)) {
    return true;
  }
  KeyValue smallestScanKeyValue = scan.isReversed() ?
      KeyValueUtil.createFirstOnRow(scan.getStopRow()) :
      KeyValueUtil.createFirstOnRow(scan.getStartRow());
  KeyValue largestScanKeyValue = scan.isReversed() ?
      KeyValueUtil.createLastOnRow(scan.getStartRow()) :
      KeyValueUtil.createLastOnRow(scan.getStopRow());
  boolean nonOverLapping =
      (getComparator().compareFlatKey(this.getFirstKey(), largestScanKeyValue.getKey()) > 0
          && !Bytes.equals(scan.isReversed() ? scan.getStartRow() : scan.getStopRow(),
          HConstants.EMPTY_END_ROW))
          || getComparator().compareFlatKey(this.getLastKey(), smallestScanKeyValue.getKey())
          < 0;
  return !nonOverLapping;
}
 

import org.apache.hadoop.hbase.client.Scan; //導入方法依賴的package包/類
@Override
public KeyValueScanner getScanner(Scan scan, final NavigableSet<byte[]> targetCols, long readPt)
    throws IOException {
  lock.readLock().lock();
  try {
    KeyValueScanner scanner = null;
    if (this.getCoprocessorHost() != null) {
      scanner = this.getCoprocessorHost().preStoreScannerOpen(this, scan, targetCols);
    }
    if (scanner == null) {
      scanner = scan.isReversed() ?
          new ReversedStoreScanner(this, getScanInfo(), scan, targetCols, readPt) :
          new StoreScanner(this, getScanInfo(), scan, targetCols, readPt);
    }
    return scanner;
  } finally {
    lock.readLock().unlock();
  }
}
 

import org.apache.hadoop.hbase.client.Scan; //導入方法依賴的package包/類
protected RegionScanner instantiateRegionScanner(Scan scan,
    List<KeyValueScanner> additionalScanners) throws IOException {
  if (scan.isReversed()) {
    if (scan.getFilter() != null) {
      scan.getFilter().setReversed(true);
    }
    return new ReversedRegionScannerImpl(scan, additionalScanners, this);
  }
  // LCMARK: for a user table, this method is called
  return new RegionScannerImpl(scan, additionalScanners, this);
}
 

import org.apache.hadoop.hbase.client.Scan; //導入方法依賴的package包/類
@Override
public KeyValueScanner preStoreScannerOpen(final ObserverContext<RegionCoprocessorEnvironment> c,
    Store store, final Scan scan, final NavigableSet<byte[]> targetCols, KeyValueScanner s)
    throws IOException {
  Region r = c.getEnvironment().getRegion();
  return scan.isReversed() ? new ReversedStoreScanner(store,
      store.getScanInfo(), scan, targetCols, r.getReadpoint(scan
          .getIsolationLevel())) : new StoreScanner(store,
      store.getScanInfo(), scan, targetCols, r.getReadpoint(scan
          .getIsolationLevel()));
}
 

import org.apache.hadoop.hbase.client.Scan; //導入方法依賴的package包/類
@Override
protected RegionScanner instantiateRegionScanner(Scan scan,
    List<KeyValueScanner> additionalScanners) throws IOException {
  if (scan.isReversed()) {
    if (scan.getFilter() != null) {
      scan.getFilter().setReversed(true);
    }
    return new HeartbeatReversedRegionScanner(scan, additionalScanners, this);
  }
  return new HeartbeatRegionScanner(scan, additionalScanners, this);
}
 

import org.apache.hadoop.hbase.client.Scan; //導入方法依賴的package包/類
/**
 * Construct a QueryMatcher for a scan
 * @param scan
 * @param scanInfo The store's immutable scan info
 * @param columns
 * @param scanType Type of the scan
 * @param earliestPutTs Earliest put seen in any of the store files.
 * @param oldestUnexpiredTS the oldest timestamp we are interested in,
 *  based on TTL
 * @param regionCoprocessorHost 
 * @throws IOException 
 */
public ScanQueryMatcher(Scan scan, ScanInfo scanInfo, NavigableSet<byte[]> columns,
    ScanType scanType, long readPointToUse, long earliestPutTs, long oldestUnexpiredTS,
    long now, RegionCoprocessorHost regionCoprocessorHost) throws IOException {
  TimeRange timeRange = scan.getColumnFamilyTimeRange().get(scanInfo.getFamily());
  if (timeRange == null) {
    this.tr = scan.getTimeRange();
  } else {
    this.tr = timeRange;
  }
  this.rowComparator = scanInfo.getComparator();
  this.regionCoprocessorHost = regionCoprocessorHost;
  this.deletes =  instantiateDeleteTracker();
  this.stopRow = scan.getStopRow();
  this.startKey = KeyValueUtil.createFirstDeleteFamilyOnRow(scan.getStartRow(),
      scanInfo.getFamily());
  this.filter = scan.getFilter();
  this.earliestPutTs = earliestPutTs;
  this.oldestUnexpiredTS = oldestUnexpiredTS;
  this.now = now;

  this.maxReadPointToTrackVersions = readPointToUse;
  this.timeToPurgeDeletes = scanInfo.getTimeToPurgeDeletes();
  this.ttl = oldestUnexpiredTS;

  /* how to deal with deletes */
  this.isUserScan = scanType == ScanType.USER_SCAN;
  // keep deleted cells: if compaction or raw scan
  this.keepDeletedCells = scan.isRaw() ? KeepDeletedCells.TRUE :
    isUserScan ? KeepDeletedCells.FALSE : scanInfo.getKeepDeletedCells();
  // retain deletes: if minor compaction or raw scanisDone
  this.retainDeletesInOutput = scanType == ScanType.COMPACT_RETAIN_DELETES || scan.isRaw();
  // seePastDeleteMarker: user initiated scans
  this.seePastDeleteMarkers =
      scanInfo.getKeepDeletedCells() != KeepDeletedCells.FALSE && isUserScan;

  int maxVersions =
      scan.isRaw() ? scan.getMaxVersions() : Math.min(scan.getMaxVersions(),
        scanInfo.getMaxVersions());

  // Single branch to deal with two types of reads (columns vs all in family)
  if (columns == null || columns.size() == 0) {
    // there is always a null column in the wildcard column query.
    hasNullColumn = true;

    // use a specialized scan for wildcard column tracker.
    this.columns = new ScanWildcardColumnTracker(
        scanInfo.getMinVersions(), maxVersions, oldestUnexpiredTS);
  } else {
    // whether there is null column in the explicit column query
    hasNullColumn = (columns.first().length == 0);

    // We can share the ExplicitColumnTracker, diff is we reset
    // between rows, not between storefiles.
    this.columns = new ExplicitColumnTracker(columns, scanInfo.getMinVersions(), maxVersions,
        oldestUnexpiredTS);
  }
  this.isReversed = scan.isReversed();
}