@Override
    void perform() throws IOException {
      HTableDescriptor selected = selectTable(disabledTables);
      if (selected == null) {
        return;
      }

      Admin admin = connection.getAdmin();
      try {
        HColumnDescriptor cfd = createFamilyDesc();
        if (selected.hasFamily(cfd.getName())) {
          LOG.info(
              new String(cfd.getName()) + " already exists in table " + selected.getTableName());
          return;
        }
        TableName tableName = selected.getTableName();
        LOG.info("Adding column family: " + cfd + " to table: " + tableName);
        admin.addColumn(tableName, cfd);
        // assertion
        HTableDescriptor freshTableDesc = admin.getTableDescriptor(tableName);
        Assert.assertTrue(
            "Column family: " + cfd + " was not added", freshTableDesc.hasFamily(cfd.getName()));
        LOG.info("Added column family: " + cfd + " to table: " + tableName);
        disabledTables.put(tableName, freshTableDesc);
      } catch (Exception e) {
        LOG.warn("Caught exception in action: " + this.getClass());
        throw e;
      } finally {
        admin.close();
      }
      verifyTables();
    }
    @Override
    void perform() throws IOException {
      HTableDescriptor selected = selectTable(disabledTables);
      HColumnDescriptor cfd = selectFamily(selected);
      if (selected == null || cfd == null) {
        return;
      }

      Admin admin = connection.getAdmin();
      try {
        if (selected.getColumnFamilies().length < 2) {
          LOG.info("No enough column families to delete in table " + selected.getTableName());
          return;
        }
        TableName tableName = selected.getTableName();
        LOG.info("Deleting column family: " + cfd + " from table: " + tableName);
        admin.deleteColumnFamily(tableName, cfd.getName());
        // assertion
        HTableDescriptor freshTableDesc = admin.getTableDescriptor(tableName);
        Assert.assertFalse(
            "Column family: " + cfd + " was not added", freshTableDesc.hasFamily(cfd.getName()));
        LOG.info("Deleted column family: " + cfd + " from table: " + tableName);
        disabledTables.put(tableName, freshTableDesc);
      } catch (Exception e) {
        LOG.warn("Caught exception in action: " + this.getClass());
        throw e;
      } finally {
        admin.close();
      }
      verifyTables();
    }
 @Override
 public HTableDescriptor createHtd(final String tableName) {
   HTableDescriptor htd = new HTableDescriptor(tableName);
   HColumnDescriptor hcd = new HColumnDescriptor(TEST_FAMILY);
   hcd.setMobEnabled(true);
   hcd.setMobThreshold(0L);
   htd.addFamily(hcd);
   return htd;
 }
    @Override
    void perform() throws IOException {
      HTableDescriptor selected = selectTable(disabledTables);
      if (selected == null) {
        return;
      }
      HColumnDescriptor columnDesc = selectFamily(selected);
      if (columnDesc == null) {
        return;
      }

      Admin admin = connection.getAdmin();
      try {
        TableName tableName = selected.getTableName();
        // possible DataBlockEncoding ids
        int[] possibleIds = {0, 2, 3, 4, 6};
        short id = (short) possibleIds[RandomUtils.nextInt(possibleIds.length)];
        LOG.info(
            "Altering encoding of column family: "
                + columnDesc
                + " to: "
                + id
                + " in table: "
                + tableName);
        columnDesc.setDataBlockEncoding(DataBlockEncoding.getEncodingById(id));
        admin.modifyTable(tableName, selected);
        // assertion
        HTableDescriptor freshTableDesc = admin.getTableDescriptor(tableName);
        HColumnDescriptor freshColumnDesc = freshTableDesc.getFamily(columnDesc.getName());
        Assert.assertEquals(
            "Encoding of column family: " + columnDesc + " was not altered",
            freshColumnDesc.getDataBlockEncoding().getId(),
            id);
        LOG.info(
            "Altered encoding of column family: "
                + freshColumnDesc
                + " to: "
                + id
                + " in table: "
                + tableName);
        disabledTables.put(tableName, freshTableDesc);
      } catch (Exception e) {
        LOG.warn("Caught exception in action: " + this.getClass());
        throw e;
      } finally {
        admin.close();
      }
      verifyTables();
    }
    // populate tables
    @Override
    void perform() throws IOException {
      HTableDescriptor selected = selectTable(enabledTables);
      if (selected == null) {
        return;
      }

      Admin admin = connection.getAdmin();
      TableName tableName = selected.getTableName();
      try (Table table = connection.getTable(tableName)) {
        ArrayList<HRegionInfo> regionInfos =
            new ArrayList<HRegionInfo>(admin.getTableRegions(selected.getTableName()));
        int numRegions = regionInfos.size();
        // average number of rows to be added per action to each region
        int average_rows = 1;
        int numRows = average_rows * numRegions;
        LOG.info("Adding " + numRows + " rows to table: " + selected);
        for (int i = 0; i < numRows; i++) {
          // nextInt(Integer.MAX_VALUE)) to return positive numbers only
          byte[] rowKey =
              Bytes.toBytes(
                  "row-" + String.format("%010d", RandomUtils.nextInt(Integer.MAX_VALUE)));
          HColumnDescriptor cfd = selectFamily(selected);
          if (cfd == null) {
            return;
          }
          byte[] family = cfd.getName();
          byte[] qualifier = Bytes.toBytes("col-" + RandomUtils.nextInt(Integer.MAX_VALUE) % 10);
          byte[] value = Bytes.toBytes("val-" + RandomStringUtils.randomAlphanumeric(10));
          Put put = new Put(rowKey);
          put.addColumn(family, qualifier, value);
          table.put(put);
        }
        HTableDescriptor freshTableDesc = admin.getTableDescriptor(tableName);
        enabledTables.put(tableName, freshTableDesc);
        LOG.info("Added " + numRows + " rows to table: " + selected);
      } catch (Exception e) {
        LOG.warn("Caught exception in action: " + this.getClass());
        throw e;
      } finally {
        admin.close();
      }
      verifyTables();
    }
 /** Create the Mob Table. */
 public static void createMobTable(
     final HBaseTestingUtility util,
     final TableName tableName,
     int regionReplication,
     final byte[]... families)
     throws IOException, InterruptedException {
   HTableDescriptor htd = new HTableDescriptor(tableName);
   htd.setRegionReplication(regionReplication);
   for (byte[] family : families) {
     HColumnDescriptor hcd = new HColumnDescriptor(family);
     hcd.setMobEnabled(true);
     hcd.setMobThreshold(0L);
     htd.addFamily(hcd);
   }
   byte[][] splitKeys = SnapshotTestingUtils.getSplitKeys();
   util.getHBaseAdmin().createTable(htd, splitKeys);
   SnapshotTestingUtils.waitForTableToBeOnline(util, tableName);
   assertEquals(
       (splitKeys.length + 1) * regionReplication,
       util.getHBaseAdmin().getTableRegions(tableName).size());
 }
 /**
  * Create a Mob table.
  *
  * @param util
  * @param tableName
  * @param families
  * @return An HTable instance for the created table.
  * @throws IOException
  */
 public static Table createMobTable(
     final HBaseTestingUtility util, final TableName tableName, final byte[]... families)
     throws IOException {
   HTableDescriptor htd = new HTableDescriptor(tableName);
   for (byte[] family : families) {
     HColumnDescriptor hcd = new HColumnDescriptor(family);
     // Disable blooms (they are on by default as of 0.95) but we disable them
     // here because
     // tests have hard coded counts of what to expect in block cache, etc.,
     // and blooms being
     // on is interfering.
     hcd.setBloomFilterType(BloomType.NONE);
     hcd.setMobEnabled(true);
     hcd.setMobThreshold(0L);
     htd.addFamily(hcd);
   }
   util.getHBaseAdmin().createTable(htd);
   // HBaseAdmin only waits for regions to appear in hbase:meta we should wait
   // until they are assigned
   util.waitUntilAllRegionsAssigned(htd.getTableName());
   return ConnectionFactory.createConnection(util.getConfiguration()).getTable(htd.getTableName());
 }
    @Override
    void perform() throws IOException {
      HTableDescriptor selected = selectTable(disabledTables);
      if (selected == null) {
        return;
      }
      HColumnDescriptor columnDesc = selectFamily(selected);
      if (columnDesc == null) {
        return;
      }

      Admin admin = connection.getAdmin();
      int versions = RandomUtils.nextInt(10) + 3;
      try {
        TableName tableName = selected.getTableName();
        LOG.info(
            "Altering versions of column family: "
                + columnDesc
                + " to: "
                + versions
                + " in table: "
                + tableName);
        columnDesc.setMinVersions(versions);
        columnDesc.setMaxVersions(versions);
        admin.modifyTable(tableName, selected);
        // assertion
        HTableDescriptor freshTableDesc = admin.getTableDescriptor(tableName);
        HColumnDescriptor freshColumnDesc = freshTableDesc.getFamily(columnDesc.getName());
        Assert.assertEquals(
            "Column family: " + columnDesc + " was not altered",
            freshColumnDesc.getMaxVersions(),
            versions);
        Assert.assertEquals(
            "Column family: " + freshColumnDesc + " was not altered",
            freshColumnDesc.getMinVersions(),
            versions);
        LOG.info(
            "Altered versions of column family: "
                + columnDesc
                + " to: "
                + versions
                + " in table: "
                + tableName);
        disabledTables.put(tableName, freshTableDesc);
      } catch (Exception e) {
        LOG.warn("Caught exception in action: " + this.getClass());
        throw e;
      } finally {
        admin.close();
      }
      verifyTables();
    }