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.

      }
    }


    public static void doScan(
        HRegion region, Scan scan, List<Cell> result) throws IOException {
      InternalScanner scanner = null;
      try {
        scan.setIsolationLevel(IsolationLevel.READ_UNCOMMITTED);
        scanner = region.getScanner(scan);
        result.clear();
        scanner.next(result);
      } finally {
        if (scanner != null) scanner.close();
      }
    }

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   */
  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;
  }

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      root.initialize();


      Scan scan = new Scan();
      scan.addColumn(HConstants.CATALOG_FAMILY,
          HConstants.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);

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   */
  public static List<KeyValue> getFromStoreFile(Store store,
                                                Get get) throws IOException {
    ReadWriteConsistencyControl.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();

View Full Code Here

  private void verifyMerge(final HRegion merged, final int upperbound)
  throws IOException {
    //Test
    Scan scan = new Scan();
    scan.addFamily(FAMILY);
    InternalScanner scanner = merged.getScanner(scan);
    try {
    List<KeyValue> testRes = null;
      while (true) {
        testRes = new ArrayList<KeyValue>();
        boolean hasNext = scanner.next(testRes);
        if (!hasNext) {
          break;
        }
      }
    } finally {
      scanner.close();
    }


    //!Test


    for (int i = 0; i < upperbound; i++) {

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      root.initialize();


      Scan scan = new Scan();
      scan.addColumn(HConstants.CATALOG_FAMILY,
          HConstants.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);

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   */
  public void scanMetaRegion(final HRegion r, final ScannerListener listener)
  throws IOException {
    Scan scan = new Scan();
    scan.addColumn(HConstants.CATALOG_FAMILY, HConstants.REGIONINFO_QUALIFIER);
    InternalScanner s = r.getScanner(scan);
    try {
      List<KeyValue> results = new ArrayList<KeyValue>();
      boolean hasNext = true;
      do {
        hasNext = s.next(results);
        HRegionInfo info = null;
        for (KeyValue kv: results) {
          info = Writables.getHRegionInfoOrNull(kv.getValue());
          if (info == null) {
            LOG.warn("Region info is null for row " +
              Bytes.toStringBinary(kv.getRow()) + " in table " +
              r.getTableDesc().getNameAsString());
          }
          continue;
        }
        if (!listener.processRow(info)) {
          break;
        }
        results.clear();
      } while (hasNext);
    } finally {
      s.close();
    }
  }

View Full Code Here

   */
  public static List<KeyValue> getFromStoreFile(Store store,
                                                Get get) throws IOException {
    ReadWriteConsistencyControl.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();

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    for (String s: prefixMap.keySet()) {
      filter = new ColumnPrefixFilter(Bytes.toBytes(s));


      scan.setFilter(filter);


      InternalScanner scanner = region.getScanner(scan);
      List<KeyValue> results = new ArrayList<KeyValue>();
      while(scanner.next(results));
      assertEquals(prefixMap.get(s).size(), results.size());
    }
  }

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      //this is how this test differs from the one above
      FilterList filterList = new FilterList(FilterList.Operator.MUST_PASS_ALL);
      filterList.addFilter(filter);
      scan.setFilter(filterList);


      InternalScanner scanner = region.getScanner(scan);
      List<KeyValue> results = new ArrayList<KeyValue>();
      while(scanner.next(results));
      assertEquals(prefixMap.get(s).size(), results.size());
    }
  }

View Full Code Here

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