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

org.apache.hadoop.hbase.client.HBaseAdmin
Provides an interface to manage HBase database table metadata + general administrative functions. Use HBaseAdmin to create, drop, list, enable and disable tables. Use it also to add and drop table column families.
See {@link HTable} to add, update, and delete data from an individual table.
Currently HBaseAdmin instances are not expected to be long-lived. For example, an HBaseAdmin instance will not ride over a Master restart.

  /**
   * To repair region consistency, one must call connect() in order to repair
   * online state.
   */
  public void connect() throws IOException {
    admin = new HBaseAdmin(getConf());
    meta = new HTable(getConf(), HConstants.META_TABLE_NAME);
    status = admin.getMaster().getClusterStatus();
    connection = admin.getConnection();
  }

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   HTableDescriptor[] getHTableDescriptors(List<String> tableNames) {
    HTableDescriptor[] htd = new HTableDescriptor[0];
     try {
       LOG.info("getHTableDescriptors == tableNames => " + tableNames);
       htd = new HBaseAdmin(getConf()).getTableDescriptors(tableNames);
     } catch (IOException e) {
       LOG.debug("Exception getting table descriptors", e);
     }
     return htd;
  }

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      this(HBaseConfiguration.create());
    }


    protected HBaseHandler(final Configuration c) throws IOException {
      this.conf = c;
      admin = new HBaseAdmin(conf);
      scannerMap = new HashMap<Integer, ResultScanner>();
      this.coalescer = new IncrementCoalescer(this);
    }

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    }
    // flush cache of regions
    HConnection conn = table.getConnection();
    conn.clearRegionCache();
    // assign all the new regions IF table is enabled.
    HBaseAdmin admin = getHBaseAdmin();
    if (admin.isTableEnabled(table.getTableName())) {
      for(HRegionInfo hri : newRegions) {
        admin.assign(hri.getRegionName());
      }
    }


    meta.close();

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   * @throws IOException
   */
  public synchronized HBaseAdmin getHBaseAdmin()
  throws IOException {
    if (hbaseAdmin == null){
      hbaseAdmin = new HBaseAdmin(new Configuration(getConfiguration()));
    }
    return hbaseAdmin;
  }

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    hcd.setCompressionType(compression);
    desc.addFamily(hcd);


    int totalNumberOfRegions = 0;
    try {
      HBaseAdmin admin = new HBaseAdmin(conf);


      // create a table a pre-splits regions.
      // The number of splits is set as:
      //    region servers * regions per region server).
      int numberOfServers = admin.getClusterStatus().getServers().size();
      if (numberOfServers == 0) {
        throw new IllegalStateException("No live regionservers");
      }


      totalNumberOfRegions = numberOfServers * DEFAULT_REGIONS_PER_SERVER;
      LOG.info("Number of live regionservers: " + numberOfServers + ", " +
          "pre-splitting table into " + totalNumberOfRegions + " regions " +
          "(default regions per server: " + DEFAULT_REGIONS_PER_SERVER + ")");


      byte[][] splits = new RegionSplitter.HexStringSplit().split(
          totalNumberOfRegions);


      admin.createTable(desc, splits);
      admin.close();
    } catch (MasterNotRunningException e) {
      LOG.error("Master not running", e);
      throw new IOException(e);
    } catch (TableExistsException e) {
      LOG.warn("Table " + Bytes.toStringBinary(tableName) +

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    USER_RW_ON_TABLE = User.createUserForTesting(conf, "rwuser_1", new String[0]);
    USER_OWNER = User.createUserForTesting(conf, "owner", new String[0]);
    USER_CREATE = User.createUserForTesting(conf, "tbl_create", new String[0]);
    USER_NONE = User.createUserForTesting(conf, "nouser", new String[0]);


    HBaseAdmin admin = TEST_UTIL.getHBaseAdmin();
    HTableDescriptor htd = new HTableDescriptor(TEST_TABLE);
    htd.addFamily(new HColumnDescriptor(TEST_FAMILY));
    htd.setOwner(USER_OWNER);
    admin.createTable(htd);


    HRegion region = TEST_UTIL.getHBaseCluster().getRegions(TEST_TABLE).get(0);
    RegionCoprocessorHost rcpHost = region.getCoprocessorHost();
    RCP_ENV = rcpHost.createEnvironment(AccessController.class, ACCESS_CONTROLLER,
      Coprocessor.PRIORITY_HIGHEST, 1, conf);

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    final byte[] family1 = Bytes.toBytes("f1");
    final byte[] family2 = Bytes.toBytes("f2");
    final byte[] qualifier = Bytes.toBytes("q");


    // create table
    HBaseAdmin admin = TEST_UTIL.getHBaseAdmin();
    if (admin.tableExists(tableName)) {
      admin.disableTable(tableName);
      admin.deleteTable(tableName);
    }
    HTableDescriptor htd = new HTableDescriptor(tableName);
    htd.addFamily(new HColumnDescriptor(family1));
    htd.addFamily(new HColumnDescriptor(family2));
    admin.createTable(htd);


    // create temp users
    User tblUser = User
        .createUserForTesting(TEST_UTIL.getConfiguration(), "tbluser", new String[0]);
    User gblUser = User
        .createUserForTesting(TEST_UTIL.getConfiguration(), "gbluser", new String[0]);


    // prepare actions:
    PrivilegedExceptionAction putActionAll = new PrivilegedExceptionAction() {
      public Object run() throws Exception {
        Put p = new Put(Bytes.toBytes("a"));
        p.add(family1, qualifier, Bytes.toBytes("v1"));
        p.add(family2, qualifier, Bytes.toBytes("v2"));
        HTable t = new HTable(conf, tableName);
        try {
          t.put(p);
        } finally {
          t.close();
        }
        return null;
      }
    };
    PrivilegedExceptionAction putAction1 = new PrivilegedExceptionAction() {
      public Object run() throws Exception {
        Put p = new Put(Bytes.toBytes("a"));
        p.add(family1, qualifier, Bytes.toBytes("v1"));
        HTable t = new HTable(conf, tableName);
        try {
          t.put(p);
        } finally {
          t.close();
        }
        return null;
      }
    };
    PrivilegedExceptionAction putAction2 = new PrivilegedExceptionAction() {
      public Object run() throws Exception {
        Put p = new Put(Bytes.toBytes("a"));
        p.add(family2, qualifier, Bytes.toBytes("v2"));
        HTable t = new HTable(conf, tableName);
        try {
          t.put(p);
        } finally {
          t.close();
        }
        return null;
      }
    };
    PrivilegedExceptionAction getActionAll = new PrivilegedExceptionAction() {
      public Object run() throws Exception {
        Get g = new Get(Bytes.toBytes("random_row"));
        g.addFamily(family1);
        g.addFamily(family2);
        HTable t = new HTable(conf, tableName);
        try {
          t.get(g);
        } finally {
          t.close();
        }
        return null;
      }
    };
    PrivilegedExceptionAction getAction1 = new PrivilegedExceptionAction() {
      public Object run() throws Exception {
        Get g = new Get(Bytes.toBytes("random_row"));
        g.addFamily(family1);
        HTable t = new HTable(conf, tableName);
        try {
          t.get(g);
        } finally {
          t.close();
        }
        return null;
      }
    };
    PrivilegedExceptionAction getAction2 = new PrivilegedExceptionAction() {
      public Object run() throws Exception {
        Get g = new Get(Bytes.toBytes("random_row"));
        g.addFamily(family2);
        HTable t = new HTable(conf, tableName);
        try {
          t.get(g);
        } finally {
          t.close();
        }
        return null;
      }
    };
    PrivilegedExceptionAction deleteActionAll = new PrivilegedExceptionAction() {
      public Object run() throws Exception {
        Delete d = new Delete(Bytes.toBytes("random_row"));
        d.deleteFamily(family1);
        d.deleteFamily(family2);
        HTable t = new HTable(conf, tableName);
        try {
          t.delete(d);
        } finally {
          t.close();
        }
        return null;
      }
    };
    PrivilegedExceptionAction deleteAction1 = new PrivilegedExceptionAction() {
      public Object run() throws Exception {
        Delete d = new Delete(Bytes.toBytes("random_row"));
        d.deleteFamily(family1);
        HTable t = new HTable(conf, tableName);
        try {
          t.delete(d);
        } finally {
          t.close();
        }
        return null;
      }
    };
    PrivilegedExceptionAction deleteAction2 = new PrivilegedExceptionAction() {
      public Object run() throws Exception {
        Delete d = new Delete(Bytes.toBytes("random_row"));
        d.deleteFamily(family2);
        HTable t = new HTable(conf, tableName);
        try {
          t.delete(d);
        } finally {
          t.close();
        }
        return null;
      }
    };


    // initial check:
    verifyDenied(tblUser, getActionAll, getAction1, getAction2);
    verifyDenied(tblUser, putActionAll, putAction1, putAction2);
    verifyDenied(tblUser, deleteActionAll, deleteAction1, deleteAction2);


    verifyDenied(gblUser, getActionAll, getAction1, getAction2);
    verifyDenied(gblUser, putActionAll, putAction1, putAction2);
    verifyDenied(gblUser, deleteActionAll, deleteAction1, deleteAction2);


    // grant table read permission
    HTable acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      protocol.grant(new UserPermission(Bytes.toBytes(tblUser.getShortName()), tableName, null,
        Permission.Action.READ));
      protocol.grant(new UserPermission(Bytes.toBytes(gblUser.getShortName()),
        Permission.Action.READ));
    } finally {
      acl.close();
    }


    Thread.sleep(100);


    // check
    verifyAllowed(tblUser, getActionAll, getAction1, getAction2);
    verifyDenied(tblUser, putActionAll, putAction1, putAction2);
    verifyDenied(tblUser, deleteActionAll, deleteAction1, deleteAction2);


    verifyAllowed(gblUser, getActionAll, getAction1, getAction2);
    verifyDenied(gblUser, putActionAll, putAction1, putAction2);
    verifyDenied(gblUser, deleteActionAll, deleteAction1, deleteAction2);


    // grant table write permission
    acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      protocol.grant(new UserPermission(Bytes.toBytes(tblUser.getShortName()), tableName, null,
        Permission.Action.WRITE));
      protocol.grant(new UserPermission(Bytes.toBytes(gblUser.getShortName()),
        Permission.Action.WRITE));
    } finally {
      acl.close();
    }


    Thread.sleep(100);


    verifyDenied(tblUser, getActionAll, getAction1, getAction2);
    verifyAllowed(tblUser, putActionAll, putAction1, putAction2);
    verifyAllowed(tblUser, deleteActionAll, deleteAction1, deleteAction2);


    verifyDenied(gblUser, getActionAll, getAction1, getAction2);
    verifyAllowed(gblUser, putActionAll, putAction1, putAction2);
    verifyAllowed(gblUser, deleteActionAll, deleteAction1, deleteAction2);


    // revoke table permission
    acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      protocol.grant(new UserPermission(Bytes.toBytes(tblUser.getShortName()), tableName, null,
        Permission.Action.READ, Permission.Action.WRITE));
      protocol.revoke(new UserPermission(Bytes.toBytes(tblUser.getShortName()), tableName, null));
      protocol.revoke(new UserPermission(Bytes.toBytes(gblUser.getShortName())));
    } finally {
      acl.close();
    }


    Thread.sleep(100);


    verifyDenied(tblUser, getActionAll, getAction1, getAction2);
    verifyDenied(tblUser, putActionAll, putAction1, putAction2);
    verifyDenied(tblUser, deleteActionAll, deleteAction1, deleteAction2);


    verifyDenied(gblUser, getActionAll, getAction1, getAction2);
    verifyDenied(gblUser, putActionAll, putAction1, putAction2);
    verifyDenied(gblUser, deleteActionAll, deleteAction1, deleteAction2);


    // grant column family read permission
    acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      protocol.grant(new UserPermission(Bytes.toBytes(tblUser.getShortName()), tableName, family1,
        Permission.Action.READ));
      protocol.grant(new UserPermission(Bytes.toBytes(gblUser.getShortName()),
        Permission.Action.READ));
    } finally {
      acl.close();
    }


    Thread.sleep(100);


    // Access should be denied for family2
    verifyAllowed(tblUser, getActionAll, getAction1);
    verifyDenied(tblUser, getAction2);
    verifyDenied(tblUser, putActionAll, putAction1, putAction2);
    verifyDenied(tblUser, deleteActionAll, deleteAction1, deleteAction2);


    verifyAllowed(gblUser, getActionAll, getAction1, getAction2);
    verifyDenied(gblUser, putActionAll, putAction1, putAction2);
    verifyDenied(gblUser, deleteActionAll, deleteAction1, deleteAction2);


    // grant column family write permission
    acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      protocol.grant(new UserPermission(Bytes.toBytes(tblUser.getShortName()), tableName, family2,
        Permission.Action.WRITE));
      protocol.grant(new UserPermission(Bytes.toBytes(gblUser.getShortName()),
        Permission.Action.WRITE));
    } finally {
      acl.close();
    }


    Thread.sleep(100);


    // READ from family1, WRITE to family2 are allowed
    verifyAllowed(tblUser, getActionAll, getAction1);
    verifyAllowed(tblUser, putAction2, deleteAction2);
    verifyDenied(tblUser, getAction2);
    verifyDenied(tblUser, putActionAll, putAction1);
    verifyDenied(tblUser, deleteActionAll, deleteAction1);


    verifyDenied(gblUser, getActionAll, getAction1, getAction2);
    verifyAllowed(gblUser, putActionAll, putAction1, putAction2);
    verifyAllowed(gblUser, deleteActionAll, deleteAction1, deleteAction2);


    // revoke column family permission
    acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      protocol.revoke(new UserPermission(Bytes.toBytes(tblUser.getShortName()), tableName, family2));
      protocol.revoke(new UserPermission(Bytes.toBytes(gblUser.getShortName())));
    } finally {
      acl.close();
    }


    Thread.sleep(100);


    // Revoke on family2 should not have impact on family1 permissions
    verifyAllowed(tblUser, getActionAll, getAction1);
    verifyDenied(tblUser, getAction2);
    verifyDenied(tblUser, putActionAll, putAction1, putAction2);
    verifyDenied(tblUser, deleteActionAll, deleteAction1, deleteAction2);


    // Should not have access as global permissions are completely revoked
    verifyDenied(gblUser, getActionAll, getAction1, getAction2);
    verifyDenied(gblUser, putActionAll, putAction1, putAction2);
    verifyDenied(gblUser, deleteActionAll, deleteAction1, deleteAction2);


    // delete table
    admin.disableTable(tableName);
    admin.deleteTable(tableName);
  }

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    final byte[] family1 = Bytes.toBytes("f1");
    final byte[] family2 = Bytes.toBytes("f2");
    final byte[] qualifier = Bytes.toBytes("q");


    // create table
    HBaseAdmin admin = TEST_UTIL.getHBaseAdmin();
    if (admin.tableExists(tableName)) {
      admin.disableTable(tableName);
      admin.deleteTable(tableName);
    }
    HTableDescriptor htd = new HTableDescriptor(tableName);
    htd.addFamily(new HColumnDescriptor(family1));
    htd.addFamily(new HColumnDescriptor(family2));
    admin.createTable(htd);


    // create temp users
    User user = User.createUserForTesting(TEST_UTIL.getConfiguration(), "user", new String[0]);


    PrivilegedExceptionAction getQualifierAction = new PrivilegedExceptionAction() {
      public Object run() throws Exception {
        Get g = new Get(Bytes.toBytes("random_row"));
        g.addColumn(family1, qualifier);
        HTable t = new HTable(conf, tableName);
        try {
          t.get(g);
        } finally {
          t.close();
        }
        return null;
      }
    };
    PrivilegedExceptionAction putQualifierAction = new PrivilegedExceptionAction() {
      public Object run() throws Exception {
        Put p = new Put(Bytes.toBytes("random_row"));
        p.add(family1, qualifier, Bytes.toBytes("v1"));
        HTable t = new HTable(conf, tableName);
        try {
          t.put(p);
        } finally {
          t.close();
        }
        return null;
      }
    };
    PrivilegedExceptionAction deleteQualifierAction = new PrivilegedExceptionAction() {
      public Object run() throws Exception {
        Delete d = new Delete(Bytes.toBytes("random_row"));
        d.deleteColumn(family1, qualifier);
        // d.deleteFamily(family1);
        HTable t = new HTable(conf, tableName);
        try {
          t.delete(d);
        } finally {
          t.close();
        }
        return null;
      }
    };


    HTable acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      protocol.revoke(new UserPermission(Bytes.toBytes(user.getShortName()), tableName, family1));
    } finally {
      acl.close();
    }


    verifyDenied(user, getQualifierAction);
    verifyDenied(user, putQualifierAction);
    verifyDenied(user, deleteQualifierAction);


    acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      protocol.grant(new UserPermission(Bytes.toBytes(user.getShortName()), tableName, family1,
        qualifier, Permission.Action.READ));
    } finally {
      acl.close();
    }


    Thread.sleep(100);


    verifyAllowed(user, getQualifierAction);
    verifyDenied(user, putQualifierAction);
    verifyDenied(user, deleteQualifierAction);


    // only grant write permission
    // TODO: comment this portion after HBASE-3583
    acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      protocol.grant(new UserPermission(Bytes.toBytes(user.getShortName()), tableName, family1,
        qualifier, Permission.Action.WRITE));
    } finally {
      acl.close();
    }


    Thread.sleep(100);


    verifyDenied(user, getQualifierAction);
    verifyAllowed(user, putQualifierAction);
    verifyAllowed(user, deleteQualifierAction);


    // grant both read and write permission.
    acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      protocol.grant(new UserPermission(Bytes.toBytes(user.getShortName()), tableName, family1,
        qualifier, Permission.Action.READ, Permission.Action.WRITE));
    } finally {
      acl.close();
    }


    Thread.sleep(100);


    verifyAllowed(user, getQualifierAction);
    verifyAllowed(user, putQualifierAction);
    verifyAllowed(user, deleteQualifierAction);


    // revoke family level permission won't impact column level.
    acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      protocol.revoke(new UserPermission(Bytes.toBytes(user.getShortName()), tableName, family1,
        qualifier));
    } finally {
      acl.close();
    }


    Thread.sleep(100);


    verifyDenied(user, getQualifierAction);
    verifyDenied(user, putQualifierAction);
    verifyDenied(user, deleteQualifierAction);


    // delete table
    admin.disableTable(tableName);
    admin.deleteTable(tableName);
  }

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    final byte[] family2 = Bytes.toBytes("f2");
    final byte[] qualifier = Bytes.toBytes("q");
    final byte[] user = Bytes.toBytes("user");


    // create table
    HBaseAdmin admin = TEST_UTIL.getHBaseAdmin();
    if (admin.tableExists(tableName)) {
      admin.disableTable(tableName);
      admin.deleteTable(tableName);
    }
    HTableDescriptor htd = new HTableDescriptor(tableName);
    htd.addFamily(new HColumnDescriptor(family1));
    htd.addFamily(new HColumnDescriptor(family2));
    htd.setOwner(USER_OWNER);
    admin.createTable(htd);


    List<UserPermission> perms;
    HTable acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      perms = protocol.getUserPermissions(tableName);
    } finally {
      acl.close();
    }


    UserPermission ownerperm = new UserPermission(Bytes.toBytes(USER_OWNER.getName()), tableName,
        null, Action.values());
    assertTrue("Owner should have all permissions on table",
      hasFoundUserPermission(ownerperm, perms));


    UserPermission up = new UserPermission(user, tableName, family1, qualifier,
        Permission.Action.READ);
    assertFalse("User should not be granted permission: " + up.toString(),
      hasFoundUserPermission(up, perms));


    // grant read permission
    UserPermission upToSet = new UserPermission(user, tableName, family1, qualifier,
        Permission.Action.READ);


    acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      protocol.grant(upToSet);
      perms = protocol.getUserPermissions(tableName);
    } finally {
      acl.close();
    }


    UserPermission upToVerify = new UserPermission(user, tableName, family1, qualifier,
        Permission.Action.READ);
    assertTrue("User should be granted permission: " + upToVerify.toString(),
      hasFoundUserPermission(upToVerify, perms));


    upToVerify = new UserPermission(user, tableName, family1, qualifier, Permission.Action.WRITE);
    assertFalse("User should not be granted permission: " + upToVerify.toString(),
      hasFoundUserPermission(upToVerify, perms));


    // grant read+write
    upToSet = new UserPermission(user, tableName, family1, qualifier, Permission.Action.WRITE,
        Permission.Action.READ);
    acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      protocol.grant(upToSet);
      perms = protocol.getUserPermissions(tableName);
    } finally {
      acl.close();
    }


    upToVerify = new UserPermission(user, tableName, family1, qualifier, Permission.Action.WRITE,
        Permission.Action.READ);
    assertTrue("User should be granted permission: " + upToVerify.toString(),
      hasFoundUserPermission(upToVerify, perms));


    acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      protocol.revoke(upToSet);
      perms = protocol.getUserPermissions(tableName);
    } finally {
      acl.close();
    }


    assertFalse("User should not be granted permission: " + upToVerify.toString(),
      hasFoundUserPermission(upToVerify, perms));


    // disable table before modification
    admin.disableTable(tableName);


    User newOwner = User.createUserForTesting(conf, "new_owner", new String[] {});
    htd.setOwner(newOwner);
    admin.modifyTable(tableName, htd);


    acl = new HTable(conf, AccessControlLists.ACL_TABLE_NAME);
    try {
      AccessControllerProtocol protocol = acl.coprocessorProxy(AccessControllerProtocol.class,
        tableName);
      perms = protocol.getUserPermissions(tableName);
    } finally {
      acl.close();
    }


    UserPermission newOwnerperm = new UserPermission(Bytes.toBytes(newOwner.getName()), tableName,
        null, Action.values());
    assertTrue("New owner should have all permissions on table",
      hasFoundUserPermission(newOwnerperm, perms));


    // delete table
    admin.deleteTable(tableName);
  }

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