Java Code Examples for org.apache.hadoop.hbase.client.Scan.getMaxVersions()

The following are Jave code examples for showing how to use getMaxVersions() of the org.apache.hadoop.hbase.client.Scan class. You can vote up the examples you like. Your votes will be used in our system to get more good examples.
Example 1
Project: ditb   File: ScanQueryMatcher.java   Source Code and License Vote up 4 votes
/**
 * 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();
}
 
Example 2
Project: ditb   File: ScannerModel.java   Source Code and License Vote up 4 votes
/**
 * @param scan the scan specification
 * @throws Exception 
 */
public static ScannerModel fromScan(Scan scan) throws Exception {
  ScannerModel model = new ScannerModel();
  model.setStartRow(scan.getStartRow());
  model.setEndRow(scan.getStopRow());
  Map<byte [], NavigableSet<byte []>> families = scan.getFamilyMap();
  if (families != null) {
    for (Map.Entry<byte [], NavigableSet<byte []>> entry : families.entrySet()) {
      if (entry.getValue() != null) {
        for (byte[] qualifier: entry.getValue()) {
          model.addColumn(Bytes.add(entry.getKey(), COLUMN_DIVIDER, qualifier));
        }
      } else {
        model.addColumn(entry.getKey());
      }
    }
  }
  model.setStartTime(scan.getTimeRange().getMin());
  model.setEndTime(scan.getTimeRange().getMax());
  int caching = scan.getCaching();
  if (caching > 0) {
    model.setCaching(caching);
  }
  int batch = scan.getBatch();
  if (batch > 0) {
    model.setBatch(batch);
  }
  int maxVersions = scan.getMaxVersions();
  if (maxVersions > 0) {
    model.setMaxVersions(maxVersions);
  }
  Filter filter = scan.getFilter();
  if (filter != null) {
    model.setFilter(stringifyFilter(filter));
  }
  // Add the visbility labels if found in the attributes
  Authorizations authorizations = scan.getAuthorizations();
  if (authorizations != null) {
    List<String> labels = authorizations.getLabels();
    for (String label : labels) {
      model.addLabel(label);
    }
  }
  return model;
}