Examples of org.apache.hadoop.hbase.client.ResultScanner

org.apache.hadoop.hbase.client.ResultScanner
Interface for client-side scanning. Go to {@link HTable} to obtain instances.

   * @throws IOException
   */
  public HTable truncateTable(TableName tableName) throws IOException {
    HTable table = new HTable(getConfiguration(), tableName);
    Scan scan = new Scan();
    ResultScanner resScan = table.getScanner(scan);
    for(Result res : resScan) {
      Delete del = new Delete(res.getRow());
      table.delete(del);
    }
    resScan = table.getScanner(scan);
    resScan.close();
    return table;
  }

View Full Code Here

  /**
   * Return the number of rows in the given table.
   */
  public int countRows(final HTable table) throws IOException {
    Scan scan = new Scan();
    ResultScanner results = table.getScanner(scan);
    int count = 0;
    for (@SuppressWarnings("unused") Result res : results) {
      count++;
    }
    results.close();
    return count;
  }

View Full Code Here

  public int countRows(final HTable table, final byte[]... families) throws IOException {
    Scan scan = new Scan();
    for (byte[] family: families) {
      scan.addFamily(family);
    }
    ResultScanner results = table.getScanner(scan);
    int count = 0;
    for (@SuppressWarnings("unused") Result res : results) {
      count++;
    }
    results.close();
    return count;
  }

View Full Code Here

  /**
   * Return an md5 digest of the entire contents of a table.
   */
  public String checksumRows(final HTable table) throws Exception {
    Scan scan = new Scan();
    ResultScanner results = table.getScanner(scan);
    MessageDigest digest = MessageDigest.getInstance("MD5");
    for (Result res : results) {
      digest.update(res.getRow());
    }
    results.close();
    return digest.toString();
  }

View Full Code Here

   */
  public List<byte[]> getMetaTableRows() throws IOException {
    // TODO: Redo using MetaReader class
    HTable t = new HTable(new Configuration(this.conf), TableName.META_TABLE_NAME);
    List<byte[]> rows = new ArrayList<byte[]>();
    ResultScanner s = t.getScanner(new Scan());
    for (Result result : s) {
      LOG.info("getMetaTableRows: row -> " +
        Bytes.toStringBinary(result.getRow()));
      rows.add(result.getRow());
    }
    s.close();
    t.close();
    return rows;
  }

View Full Code Here

   */
  public List<byte[]> getMetaTableRows(TableName tableName) throws IOException {
    // TODO: Redo using MetaReader.
    HTable t = new HTable(new Configuration(this.conf), TableName.META_TABLE_NAME);
    List<byte[]> rows = new ArrayList<byte[]>();
    ResultScanner s = t.getScanner(new Scan());
    for (Result result : s) {
      HRegionInfo info = HRegionInfo.getHRegionInfo(result);
      if (info == null) {
        LOG.error("No region info for row " + Bytes.toString(result.getRow()));
        // TODO figure out what to do for this new hosed case.
        continue;
      }


      if (info.getTable().equals(tableName)) {
        LOG.info("getMetaTableRows: row -> " +
            Bytes.toStringBinary(result.getRow()) + info);
        rows.add(result.getRow());
      }
    }
    s.close();
    t.close();
    return rows;
  }

View Full Code Here

        @Override
        public boolean evaluate() throws IOException {
          boolean allRegionsAssigned = true;
          Scan scan = new Scan();
          scan.addFamily(HConstants.CATALOG_FAMILY);
          ResultScanner s = meta.getScanner(scan);
          try {
            Result r;
            while ((r = s.next()) != null) {
              byte [] b = r.getValue(HConstants.CATALOG_FAMILY, HConstants.REGIONINFO_QUALIFIER);
              HRegionInfo info = HRegionInfo.parseFromOrNull(b);
              if (info != null && info.getTable().equals(tableName)) {
                b = r.getValue(HConstants.CATALOG_FAMILY, HConstants.SERVER_QUALIFIER);
                allRegionsAssigned &= (b != null);
              }
            }
          } finally {
            s.close();
          }
          return allRegionsAssigned;
        }
      });
    } finally {

View Full Code Here

      // The number of keys we can expect from scan - lower bound (before scan).
      // Not a strict lower bound - writer knows nothing about filters, so we report
      // this from generator. Writer might have generated the value but not put it yet.
      long onesGennedBeforeScan = dataGen.getExpectedNumberOfKeys();
      long startTs = EnvironmentEdgeManager.currentTimeMillis();
      ResultScanner results = table.getScanner(scan);
      long resultCount = 0;
      Result result = null;
      // Verify and count the results.
      while ((result = results.next()) != null) {
        boolean isOk = writer.verifyResultAgainstDataGenerator(result, true, true);
        Assert.assertTrue("Failed to verify [" + Bytes.toString(result.getRow())+ "]", isOk);
        ++resultCount;
      }
      long timeTaken = EnvironmentEdgeManager.currentTimeMillis() - startTs;

View Full Code Here

          .getInt(HConstants.HBASE_META_SCANNER_CACHING, 100);
      scan.setCaching(caching);
    }
    scan.addFamily(HConstants.CATALOG_FAMILY);
    HTable metaTable = getMetaHTable(catalogTracker);
    ResultScanner scanner = metaTable.getScanner(scan);
    try {
      Result data;
      while((data = scanner.next()) != null) {
        if (data.isEmpty()) continue;
        // Break if visit returns false.
        if (!visitor.visit(data)) break;
      }
    } finally {
      scanner.close();
      metaTable.close();
    }
    return;
  }

View Full Code Here

    @Override
    void testRow(final int i) throws IOException {
      Scan scan = new Scan(getRandomRow(this.rand, this.totalRows));
      scan.addColumn(FAMILY_NAME, QUALIFIER_NAME);
      scan.setFilter(new WhileMatchFilter(new PageFilter(120)));
      ResultScanner s = this.table.getScanner(scan);
      //int count = 0;
      for (Result rr = null; (rr = s.next()) != null;) {
        // LOG.info("" + count++ + " " + rr.toString());
      }
      s.close();
    }

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

Related Classes of org.apache.hadoop.hbase.client.ResultScanner

co.cask.cdap.data2.dataset2.lib.table.hbase.HBaseMetricsTable

com.activequant.archive.hbase.HBaseArchiveReader

com.alibaba.wasp.meta.FMetaServicesImplWithoutRetry

com.alibaba.wasp.util.ResultInHBasePrinter

com.alibaba.wasp.WaspTestingUtility

com.salesforce.hbase.index.covered.example.TestEndToEndCoveredIndexing

com.urbanairship.datacube.EmbeddedClusterTestAbstract

com.urbanairship.datacube.HBaseBackfillerTest

com.urbanairship.statshtable.StatsHTableTest

com.yahoo.omid.TestBasicTransaction

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.