from charms.reactive import when, when_not, set_state, remove_state
from charms.hadoop import get_hadoop_base
from jujubigdata.handlers import HDFS
from jujubigdata import utils


@when('namenode.ready')
@when_not('datanode.started')
def start_datanode(namenode):
    hadoop = get_hadoop_base()
    hdfs = HDFS(hadoop)
    hdfs.configure_datanode(namenode.namenodes()[0], namenode.port())
    utils.install_ssh_key('hdfs', namenode.ssh_key())
    utils.update_kv_hosts(namenode.hosts_map())
    utils.manage_etc_hosts()
    hdfs.start_datanode()
    hadoop.open_ports('datanode')
    set_state('datanode.started')


@when('datanode.started')
@when_not('namenode.ready')
def stop_datanode():
    hadoop = get_hadoop_base()
    hdfs = HDFS(hadoop)
    hdfs.stop_datanode()
    hadoop.close_ports('datanode')
    remove_state('datanode.started')

from charms.reactive import when, when_not, set_state, remove_state
from charms.layer.hadoop_base import get_hadoop_base
from jujubigdata.handlers import HDFS
from jujubigdata import utils


@when('namenode.ready')
@when_not('datanode.started')
def start_datanode(namenode):
    hadoop = get_hadoop_base()
    hdfs = HDFS(hadoop)
    hdfs.configure_datanode(namenode.namenodes()[0], namenode.port())
    utils.install_ssh_key('hdfs', namenode.ssh_key())
    utils.update_kv_hosts(namenode.hosts_map())
    utils.manage_etc_hosts()
    hdfs.start_datanode()
    hadoop.open_ports('datanode')
    set_state('datanode.started')


@when('datanode.started')
@when_not('namenode.ready')
def stop_datanode():
    hadoop = get_hadoop_base()
    hdfs = HDFS(hadoop)
    hdfs.stop_datanode()
    hadoop.close_ports('datanode')
    remove_state('datanode.started')

Update charms.hadoop reference to follow convention
Update charms.hadoop reference to follow convention

  from charms.reactive import when, when_not, set_state, remove_state
- from charms.hadoop import get_hadoop_base
+ from charms.layer.hadoop_base import get_hadoop_base
  from jujubigdata.handlers import HDFS
  from jujubigdata import utils
  
  
  @when('namenode.ready')
  @when_not('datanode.started')
  def start_datanode(namenode):
      hadoop = get_hadoop_base()
      hdfs = HDFS(hadoop)
      hdfs.configure_datanode(namenode.namenodes()[0], namenode.port())
      utils.install_ssh_key('hdfs', namenode.ssh_key())
      utils.update_kv_hosts(namenode.hosts_map())
      utils.manage_etc_hosts()
      hdfs.start_datanode()
      hadoop.open_ports('datanode')
      set_state('datanode.started')
  
  
  @when('datanode.started')
  @when_not('namenode.ready')
  def stop_datanode():
      hadoop = get_hadoop_base()
      hdfs = HDFS(hadoop)
      hdfs.stop_datanode()
      hadoop.close_ports('datanode')
      remove_state('datanode.started')
  
Update charms.hadoop reference to follow convention
## Code Before:
from charms.reactive import when, when_not, set_state, remove_state
from charms.hadoop import get_hadoop_base
from jujubigdata.handlers import HDFS
from jujubigdata import utils


@when('namenode.ready')
@when_not('datanode.started')
def start_datanode(namenode):
    hadoop = get_hadoop_base()
    hdfs = HDFS(hadoop)
    hdfs.configure_datanode(namenode.namenodes()[0], namenode.port())
    utils.install_ssh_key('hdfs', namenode.ssh_key())
    utils.update_kv_hosts(namenode.hosts_map())
    utils.manage_etc_hosts()
    hdfs.start_datanode()
    hadoop.open_ports('datanode')
    set_state('datanode.started')


@when('datanode.started')
@when_not('namenode.ready')
def stop_datanode():
    hadoop = get_hadoop_base()
    hdfs = HDFS(hadoop)
    hdfs.stop_datanode()
    hadoop.close_ports('datanode')
    remove_state('datanode.started')

## Instruction:
Update charms.hadoop reference to follow convention
## Code After:
from charms.reactive import when, when_not, set_state, remove_state
from charms.layer.hadoop_base import get_hadoop_base
from jujubigdata.handlers import HDFS
from jujubigdata import utils


@when('namenode.ready')
@when_not('datanode.started')
def start_datanode(namenode):
    hadoop = get_hadoop_base()
    hdfs = HDFS(hadoop)
    hdfs.configure_datanode(namenode.namenodes()[0], namenode.port())
    utils.install_ssh_key('hdfs', namenode.ssh_key())
    utils.update_kv_hosts(namenode.hosts_map())
    utils.manage_etc_hosts()
    hdfs.start_datanode()
    hadoop.open_ports('datanode')
    set_state('datanode.started')


@when('datanode.started')
@when_not('namenode.ready')
def stop_datanode():
    hadoop = get_hadoop_base()
    hdfs = HDFS(hadoop)
    hdfs.stop_datanode()
    hadoop.close_ports('datanode')
    remove_state('datanode.started')
