text: #!/usr/bin/env python
  """
  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  
  """
  
  # Python Imports
  import os
  import time
  
  # Ambari Commons & Resource Management Imports
  from ambari_commons.constants import UPGRADE_TYPE_ROLLING
  from resource_management.core import shell
  from resource_management.core import utils
  from resource_management.core.exceptions import ComponentIsNotRunning, Fail
  from resource_management.core.logger import Logger
  from resource_management.core.resources.system import File, Execute
  from resource_management.core.shell import as_user, quote_bash_args
  from resource_management.libraries.functions import get_user_call_output
  from resource_management.libraries.functions import StackFeature
  from resource_management.libraries.functions.check_process_status import check_process_status
  from resource_management.libraries.functions.decorator import retry
  from resource_management.libraries.functions.format import format
  from resource_management.libraries.functions.show_logs import show_logs
  from resource_management.libraries.functions.stack_features import check_stack_feature
  
  
  def hive_service(name, action='start', upgrade_type=None):
  
    import params
    import status_params
  
    if name == 'metastore':
      pid_file = status_params.hive_metastore_pid
      cmd = format("{start_metastore_path} {hive_log_dir}/hive.out {hive_log_dir}/hive.err {pid_file} {hive_server_conf_dir}")
    elif name == 'hiveserver2':
      pid_file = status_params.hive_pid
      cmd = format("{start_hiveserver2_path} {hive_log_dir}/hive-server2.out {hive_log_dir}/hive-server2.err {pid_file} {hive_server_conf_dir} {tez_conf_dir}")
  
  
      if params.security_enabled and check_stack_feature(StackFeature.HIVE_SERVER2_KERBERIZED_ENV, params.version_for_stack_feature_checks):
        hive_kinit_cmd = format("{kinit_path_local} -kt {hive_server2_keytab} {hive_principal}; ")
        Execute(hive_kinit_cmd, user=params.hive_user)
  
    pid = get_user_call_output.get_user_call_output(format("cat {pid_file}"), user=params.hive_user, is_checked_call=False)[1]
    process_id_exists_command = format("ls {pid_file} >/dev/null 2>&1 && ps -p {pid} >/dev/null 2>&1")
  
    if action == 'start':
      if name == 'hiveserver2':
        check_fs_root(params.hive_server_conf_dir, params.execute_path)
  
      daemon_cmd = cmd
      hadoop_home = params.hadoop_home
      hive_bin = "hive"
  
      # upgrading hiveserver2 (rolling_restart) means that there is an existing,
      # de-registering hiveserver2; the pid will still exist, but the new
      # hiveserver is spinning up on a new port, so the pid will be re-written
      if upgrade_type == UPGRADE_TYPE_ROLLING:
        process_id_exists_command = None
  
        if params.version and params.stack_root:
          hadoop_home = format("{stack_root}/{version}/hadoop")
          hive_bin = os.path.join(params.hive_bin, hive_bin)
        
      Execute(daemon_cmd, 
        user = params.hive_user,
        environment = { 'HADOOP_HOME': hadoop_home, 'JAVA_HOME': params.java64_home, 'HIVE_BIN': hive_bin },
        path = params.execute_path,
        not_if = process_id_exists_command)
  
      if params.hive_jdbc_driver == "com.mysql.jdbc.Driver" or \
         params.hive_jdbc_driver == "org.postgresql.Driver" or \
         params.hive_jdbc_driver == "oracle.jdbc.driver.OracleDriver":
  
        validation_called = False
  
        if params.hive_jdbc_target is not None:
          validation_called = True
          validate_connection(params.hive_jdbc_target, params.hive_lib)
  
        if not validation_called:
          emessage = "ERROR! DB connection check should be executed at least one time!"
          Logger.error(emessage)
      
      if name == 'hiveserver2':
        wait_for_znode()
  
    elif action == 'stop':
  
      daemon_kill_cmd = format("{sudo} kill {pid}")
      daemon_hard_kill_cmd = format("{sudo} kill -9 {pid}")
  
      Execute(daemon_kill_cmd,
        not_if = format("! ({process_id_exists_command})")
      )
  
      wait_time = 5
      Execute(daemon_hard_kill_cmd,
        not_if = format("! ({process_id_exists_command}) || ( sleep {wait_time} && ! ({process_id_exists_command}) )"),
        ignore_failures = True
      )
  
      try:
        # check if stopped the process, else fail the task
        Execute(format("! ({process_id_exists_command})"),
          tries=20,
          try_sleep=3,
        )
      except:
        show_logs(params.hive_log_dir, params.hive_user)
        raise
  
      File(pid_file,
           action = "delete"
      )
  
  def validate_connection(target_path_to_jdbc, hive_lib_path):
    import params
  
    path_to_jdbc = target_path_to_jdbc
    if not params.jdbc_jar_name:
      path_to_jdbc = format("{hive_lib_path}/") + \
                     params.default_connectors_map[params.hive_jdbc_driver] if params.hive_jdbc_driver in params.default_connectors_map else None
      if not os.path.isfile(path_to_jdbc):
        path_to_jdbc = format("{hive_lib_path}/") + "*"
        error_message = "Error! Sorry, but we can't find jdbc driver with default name " + params.default_connectors_map[params.hive_jdbc_driver] + \
                        " in hive lib dir. So, db connection check can fail. Please run 'ambari-server setup --jdbc-db={db_name} --jdbc-driver={path_to_jdbc} on server host.'"
        Logger.error(error_message)
  
    db_connection_check_command = format(
      "{java64_home}/bin/java -cp {check_db_connection_jar}:{path_to_jdbc} org.apache.ambari.server.DBConnectionVerification '{hive_jdbc_connection_url}' {hive_metastore_user_name} {hive_metastore_user_passwd!p} {hive_jdbc_driver}")
  
    try:
      Execute(db_connection_check_command,
              path='/usr/sbin:/sbin:/usr/local/bin:/bin:/usr/bin', tries=5, try_sleep=10)
    except:
      show_logs(params.hive_log_dir, params.hive_user)
      raise
  
  
  def check_fs_root(conf_dir, execution_path):
    import params
  
    if not params.fs_root.startswith("hdfs://"):
      Logger.info("Skipping fs root check as fs_root does not start with hdfs://")
      return
  
    metatool_cmd = format("hive --config {conf_dir} --service metatool")
    cmd = as_user(format("{metatool_cmd} -listFSRoot", env={'PATH': execution_path}), params.hive_user) \
          + format(" 2>/dev/null | grep hdfs:// | cut -f1,2,3 -d '/' | grep -v '{fs_root}' | head -1")
    code, out = shell.call(cmd)
  
    if code == 0 and out.strip() != "" and params.fs_root.strip() != out.strip():
      out = out.strip()
      cmd = format("{metatool_cmd} -updateLocation {fs_root} {out}")
      Execute(cmd,
              user = params.hive_user,
              environment = {'PATH': execution_path}
      )
  
  @retry(times=30, sleep_time=10, err_class=Fail)
  def wait_for_znode():
    import params
    import status_params
    
    try:
      check_process_status(status_params.hive_pid)
    except ComponentIsNotRunning:
      raise Exception(format("HiveServer2 is no longer running, check the logs at {hive_log_dir}"))
    
    cmd = format("{zk_bin}/zkCli.sh -server {zk_quorum} ls /{hive_server2_zookeeper_namespace} | grep 'serverUri='")
    code, out = shell.call(cmd)
    if code == 1:
      raise Fail(format("ZooKeeper node /{hive_server2_zookeeper_namespace} is not ready yet"))
  