Examples of org.apache.hadoop.hbase.regionserver.InternalScanner

Package org.apache.hadoop.hbase.regionserver

Examples of org.apache.hadoop.hbase.regionserver.InternalScanner

org.apache.hadoop.hbase.regionserver.InternalScanner
Internal scanners differ from client-side scanners in that they operate on HStoreKeys and byte[] instead of RowResults. This is because they are actually close to how the data is physically stored, and therefore it is more convenient to interact with them that way. It is also much easier to merge the results across SortedMaps than RowResults.
Additionally, we need to be able to determine if the scanner is doing wildcard column matches (when only a column family is specified or if a column regex is specified) or if multiple members of the same column family were specified. If so, we need to ignore the timestamp to ensure that we get all the family members, as they may have been last updated at different times.

    // Open root region so we can scan it
    if (this.rootRegion == null) {
      openRootRegion();
    }


    InternalScanner rootScanner = rootRegion.getScanner(
        HConstants.COL_REGIONINFO_ARRAY, HConstants.EMPTY_START_ROW,
        HConstants.LATEST_TIMESTAMP, null);


    try {
      HStoreKey key = new HStoreKey();
      SortedMap<byte [], Cell> results =
        new TreeMap<byte [], Cell>(Bytes.BYTES_COMPARATOR);
      while (rootScanner.next(key, results)) {
        HRegionInfo info = Writables.getHRegionInfoOrNull(
            results.get(HConstants.COL_REGIONINFO).getValue());
        if (info == null) {
          LOG.warn("region info is null for row " + key.getRow() +
              " in table " + HConstants.ROOT_TABLE_NAME);
          continue;
        }
        if (!listener.processRow(info)) {
          break;
        }
        results.clear();
      }
    } finally {
      rootScanner.close();
    }
  }

View Full Code Here

   * @param listener
   * @throws IOException
   */
  public void scanMetaRegion(final HRegion m, final ScannerListener listener)
  throws IOException {
    InternalScanner metaScanner = m.getScanner(HConstants.COL_REGIONINFO_ARRAY,
      HConstants.EMPTY_START_ROW, HConstants.LATEST_TIMESTAMP, null);
    try {
      HStoreKey key = new HStoreKey();
      SortedMap<byte[], Cell> results =
        new TreeMap<byte[], Cell>(Bytes.BYTES_COMPARATOR);
      while (metaScanner.next(key, results)) {
        HRegionInfo info = Writables.getHRegionInfoOrNull(
            results.get(HConstants.COL_REGIONINFO).getValue());
        if (info == null) {
          LOG.warn("regioninfo null for row " + key.getRow() + " in table " +
            Bytes.toString(m.getTableDesc().getName()));
          continue;
        }
        if (!listener.processRow(info)) {
          break;
        }
        results.clear();
      }
    } finally {
      metaScanner.close();
    }
  }

View Full Code Here

      // Scan root region to find all the meta regions
      
      root = new HRegion(rootTableDir, hlog, fs, conf,
          HRegionInfo.ROOT_REGIONINFO, null, null);


      InternalScanner rootScanner = 
        root.getScanner(COL_REGIONINFO_ARRAY, HConstants.EMPTY_START_ROW, 
        HConstants.LATEST_TIMESTAMP, null);
      
      try {
        HStoreKey key = new HStoreKey();
        TreeMap<byte [], Cell> results =
          new TreeMap<byte [], Cell>(Bytes.BYTES_COMPARATOR);
        while(rootScanner.next(key, results)) {
          for(Cell c: results.values()) {
            HRegionInfo info = Writables.getHRegionInfoOrNull(c.getValue());
            if (info != null) {
              metaRegions.add(info);
            }
          }
        }
      } finally {
        rootScanner.close();
        try {
          root.close();
          
        } catch(IOException e) {
          LOG.error(e);

View Full Code Here

    long lastFlush;


    @Override
    public InternalScanner preCompact(ObserverContext<RegionCoprocessorEnvironment> e,
        Store store, final InternalScanner scanner) {
      return new InternalScanner() {
        @Override
        public boolean next(List<KeyValue> results) throws IOException {
          return next(results, -1);
        }

View Full Code Here

   */
  public static List<KeyValue> getFromStoreFile(Store store,
                                                Get get) throws IOException {
    MultiVersionConsistencyControl.resetThreadReadPoint();
    Scan scan = new Scan(get);
    InternalScanner scanner = (InternalScanner) store.getScanner(scan,
        scan.getFamilyMap().get(store.getFamily().getName()));


    List<KeyValue> result = new ArrayList<KeyValue>();
    scanner.next(result);
    if (!result.isEmpty()) {
      // verify that we are on the row we want:
      KeyValue kv = result.get(0);
      if (!Bytes.equals(kv.getRow(), get.getRow())) {
        result.clear();
      }
    }
    scanner.close();
    return result;
  }

View Full Code Here

    }
    super.getRequestCount().incrementAndGet();
    try {
      TransactionalRegion r = getTransactionalRegion(regionName);
      long scannerId = -1L;
      InternalScanner s = r.getScanner(transactionId, cols, firstRow,
          timestamp, filter);
      scannerId = super.addScanner(s);
      return scannerId;
    } catch (IOException e) {
      LOG.error("Error opening scanner (fsOk: " + this.fsOk + ")",

View Full Code Here

          HRegionInfo.ROOT_REGIONINFO, null);
      root.initialize(null, null);


      Scan scan = new Scan();
      scan.addColumn(CATALOG_FAMILY, REGIONINFO_QUALIFIER);
      InternalScanner rootScanner = 
        root.getScanner(scan);
      
      try {
        List<KeyValue> results = new ArrayList<KeyValue>();
        while(rootScanner.next(results)) {
          for(KeyValue kv: results) {
            HRegionInfo info = Writables.getHRegionInfoOrNull(kv.getValue());
            if (info != null) {
              metaRegions.add(info);
            }
          }
        }
      } finally {
        rootScanner.close();
        try {
          root.close();
          
        } catch(IOException e) {
          LOG.error(e);

View Full Code Here

    
  }
  
  private void verifyScan(Scan s, long expectedRows, long expectedKeys) 
  throws IOException {
    InternalScanner scanner = this.region.getScanner(s);
    List<KeyValue> results = new ArrayList<KeyValue>();
    int i = 0;
    for (boolean done = true; done; i++) {
      done = scanner.next(results);
      Arrays.sort(results.toArray(new KeyValue[results.size()]),
          KeyValue.COMPARATOR);
      LOG.info("counter=" + i + ", " + results);
      assertTrue("Scanned too many rows! Only expected " + expectedRows + 
          " total but already scanned " + (i+1), expectedRows > i);

View Full Code Here


  
  private void verifyScanNoEarlyOut(Scan s, long expectedRows, 
      long expectedKeys) 
  throws IOException {
    InternalScanner scanner = this.region.getScanner(s);
    List<KeyValue> results = new ArrayList<KeyValue>();
    int i = 0;
    for (boolean done = true; done; i++) {
      done = scanner.next(results);
      Arrays.sort(results.toArray(new KeyValue[results.size()]),
          KeyValue.COMPARATOR);
      LOG.info("counter=" + i + ", " + results);
      if(results.isEmpty()) break;
      assertTrue("Scanned too many rows! Only expected " + expectedRows +

View Full Code Here

        " rows", expectedRows, i);
  }


  private void verifyScanFull(Scan s, KeyValue [] kvs)
  throws IOException {
    InternalScanner scanner = this.region.getScanner(s);
    List<KeyValue> results = new ArrayList<KeyValue>();
    int row = 0;
    int idx = 0;
    for (boolean done = true; done; row++) {
      done = scanner.next(results);
      Arrays.sort(results.toArray(new KeyValue[results.size()]),
          KeyValue.COMPARATOR);
      assertTrue("Scanned too many keys! Only expected " + kvs.length + 
          " total but already scanned " + (results.size() + idx), 
          kvs.length >= idx + results.size());

View Full Code Here

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