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

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Example 1
Source Project: hbase   File: StoreScanner.java    License: Apache License 2.0 4 votes vote down vote up
/**
 * Opens a scanner across memstore, snapshot, and all StoreFiles. Assumes we
 * are not in a compaction.
 *
 * @param store who we scan
 * @param scan the spec
 * @param columns which columns we are scanning
 * @throws IOException
 */
public StoreScanner(HStore store, ScanInfo scanInfo, Scan scan, NavigableSet<byte[]> columns,
    long readPt) throws IOException {
  this(store, scan, scanInfo, columns != null ? columns.size() : 0, readPt,
      scan.getCacheBlocks(), ScanType.USER_SCAN);
  if (columns != null && scan.isRaw()) {
    throw new DoNotRetryIOException("Cannot specify any column for a raw scan");
  }
  matcher = UserScanQueryMatcher.create(scan, scanInfo, columns, oldestUnexpiredTS, now,
    store.getCoprocessorHost());

  store.addChangedReaderObserver(this);

  List<KeyValueScanner> scanners = null;
  try {
    // Pass columns to try to filter out unnecessary StoreFiles.
    scanners = selectScannersFrom(store,
      store.getScanners(cacheBlocks, scanUsePread, false, matcher, scan.getStartRow(),
        scan.includeStartRow(), scan.getStopRow(), scan.includeStopRow(), this.readPt));

    // Seek all scanners to the start of the Row (or if the exact matching row
    // key does not exist, then to the start of the next matching Row).
    // Always check bloom filter to optimize the top row seek for delete
    // family marker.
    seekScanners(scanners, matcher.getStartKey(), explicitColumnQuery && lazySeekEnabledGlobally,
      parallelSeekEnabled);

    // set storeLimit
    this.storeLimit = scan.getMaxResultsPerColumnFamily();

    // set rowOffset
    this.storeOffset = scan.getRowOffsetPerColumnFamily();
    addCurrentScanners(scanners);
    // Combine all seeked scanners with a heap
    resetKVHeap(scanners, comparator);
  } catch (IOException e) {
    clearAndClose(scanners);
    // remove us from the HStore#changedReaderObservers here or we'll have no chance to
    // and might cause memory leak
    store.deleteChangedReaderObserver(this);
    throw e;
  }
}