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.

  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<Cell> testRes = null;
      while (true) {
        testRes = new ArrayList<Cell>();
        boolean hasNext = scanner.next(testRes);
        if (!hasNext) {
          break;
        }
      }
    } finally {
      scanner.close();
    }


    //!Test


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

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    // do a full scan of _acl_ table


    Scan scan = new Scan();
    scan.addFamily(ACL_LIST_FAMILY);


    InternalScanner iScanner = null;
    try {
      iScanner = aclRegion.getScanner(scan);


      while (true) {
        List<Cell> row = new ArrayList<Cell>();


        boolean hasNext = iScanner.next(row);
        ListMultimap<String,TablePermission> perms = ArrayListMultimap.create();
        byte[] entry = null;
        for (Cell kv : row) {
          if (entry == null) {
            entry = CellUtil.cloneRow(kv);
          }
          Pair<String,TablePermission> permissionsOfUserOnTable =
              parsePermissionRecord(entry, kv);
          if (permissionsOfUserOnTable != null) {
            String username = permissionsOfUserOnTable.getFirst();
            TablePermission permissions = permissionsOfUserOnTable.getSecond();
            perms.put(username, permissions);
          }
        }
        if (entry != null) {
          allPerms.put(entry, perms);
        }
        if (!hasNext) {
          break;
        }
      }
    } finally {
      if (iScanner != null) {
        iScanner.close();
      }
    }


    return allPerms;
  }

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    long lastFlush;


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

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      }
    }


    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<Cell> getFromStoreFile(HStore 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<Cell> result = new ArrayList<Cell>();
    scanner.next(result);
    if (!result.isEmpty()) {
      // verify that we are on the row we want:
      Cell kv = result.get(0);
      if (!CellUtil.matchingRow(kv, get.getRow())) {
        result.clear();
      }
    }
    scanner.close();
    return result;
  }

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    Scan s = new Scan();
    WhileMatchFilter filter = new WhileMatchFilter(new PageFilter(pageSize));
    s.setFilter(filter);


    InternalScanner scanner = this.region.getScanner(s);
    int scannerCounter = 0;
    while (true) {
      boolean isMoreResults = scanner.next(new ArrayList<Cell>());
      scannerCounter++;


      if (scannerCounter >= pageSize) {
        assertTrue("The WhileMatchFilter should now filter all remaining", filter.filterAllRemaining());
      }

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  public void tes94FilterRowCompatibility() throws Exception {
    Scan s = new Scan();
    OldTestFilter filter = new OldTestFilter();
    s.setFilter(filter);


    InternalScanner scanner = this.region.getScanner(s);
    ArrayList<Cell> values = new ArrayList<Cell>();
    scanner.next(values);
    assertTrue("All rows should be filtered out", values.isEmpty());
  }

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    Scan s = new Scan();
    String prefix = "testRowOne";
    WhileMatchFilter filter = new WhileMatchFilter(new PrefixFilter(Bytes.toBytes(prefix)));
    s.setFilter(filter);


    InternalScanner scanner = this.region.getScanner(s);
    while (true) {
      ArrayList<Cell> values = new ArrayList<Cell>();
      boolean isMoreResults = scanner.next(values);
      if (!isMoreResults || !Bytes.toString(CellUtil.cloneRow(values.get(0))).startsWith(prefix)) {
        assertTrue("The WhileMatchFilter should now filter all remaining", filter.filterAllRemaining());
      }
      if (!isMoreResults) {
        break;

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    WhileMatchFilter filter = new WhileMatchFilter(
        new SingleColumnValueFilter(FAMILIES[0], QUALIFIERS_ONE[0], CompareOp.EQUAL, Bytes.toBytes("foo"))
    );
    s.setFilter(filter);


    InternalScanner scanner = this.region.getScanner(s);
    while (true) {
      ArrayList<Cell> values = new ArrayList<Cell>();
      boolean isMoreResults = scanner.next(values);
      assertTrue("The WhileMatchFilter should now filter all remaining", filter.filterAllRemaining());
      if (!isMoreResults) {
        break;
      }
    }

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    // combine these two with OR in a FilterList
    FilterList filterList = new FilterList(Operator.MUST_PASS_ONE, pf, scvf);


    Scan s1 = new Scan();
    s1.setFilter(filterList);
    InternalScanner scanner = testRegion.getScanner(s1);
    List<Cell> results = new ArrayList<Cell>();
    int resultCount = 0;
    while(scanner.next(results)) {
      resultCount++;
      byte[] row =  CellUtil.cloneRow(results.get(0));
      LOG.debug("Found row: " + Bytes.toStringBinary(row));
      assertTrue(Bytes.equals(row, Bytes.toBytes("brow"))
          || Bytes.equals(row, Bytes.toBytes("crow")));
      results.clear();
    }
    assertEquals(2, resultCount);
    scanner.close();


    HLog hlog = testRegion.getLog();
    testRegion.close();
    hlog.closeAndDelete();
  }

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