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# 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.
from charms.reactive import is_state, remove_state, set_state, when, when_any, when_none, when_not
from charmhelpers.core import hookenv
from charms.layer.apache_bigtop_base import Bigtop, get_hadoop_version
@when('hadoop-plugin.joined')
@when_not('namenode.joined')
def blocked(principal):
hookenv.status_set('blocked', 'missing required namenode relation')
@when('bigtop.available', 'hadoop-plugin.joined', 'namenode.joined')
@when_not('apache-bigtop-plugin.hdfs.installed')
def install_hadoop_client_hdfs(principal, namenode):
"""Install if the namenode has sent its FQDN.
We only need the namenode FQDN to perform the plugin install, so poll for
namenodes() data whenever we have a namenode relation. This allows us to
install asap, even if 'namenode.ready' is not set yet.
"""
if namenode.namenodes():
hookenv.status_set('maintenance', 'installing plugin (hdfs)')
nn_host = namenode.namenodes()[0]
bigtop = Bigtop()
hosts = {'namenode': nn_host}
bigtop.render_site_yaml(hosts=hosts, roles='hadoop-client')
bigtop.trigger_puppet()
set_state('apache-bigtop-plugin.hdfs.installed')
hookenv.application_version_set(get_hadoop_version())
hookenv.status_set('maintenance', 'plugin (hdfs) installed')
else:
hookenv.status_set('waiting', 'waiting for namenode fqdn')
@when('apache-bigtop-plugin.hdfs.installed')
@when('hadoop-plugin.joined', 'namenode.joined')
@when_not('namenode.ready')
def send_nn_spec(principal, namenode):
"""Send our plugin spec so the namenode can become ready."""
bigtop = Bigtop()
# Send plugin spec (must match NN spec for 'namenode.ready' to be set)
namenode.set_local_spec(bigtop.spec())
@when('apache-bigtop-plugin.hdfs.installed')
@when('hadoop-plugin.joined', 'namenode.ready')
@when_not('apache-bigtop-plugin.hdfs.ready')
def send_principal_hdfs_info(principal, namenode):
"""Send HDFS data when the namenode becomes ready."""
principal.set_installed(get_hadoop_version())
principal.set_hdfs_ready(namenode.namenodes(), namenode.port())
set_state('apache-bigtop-plugin.hdfs.ready')
@when('apache-bigtop-plugin.hdfs.ready')
@when('hadoop-plugin.joined')
@when_not('namenode.ready')
def clear_hdfs_ready(principal):
principal.clear_hdfs_ready()
remove_state('apache-bigtop-plugin.hdfs.ready')
remove_state('apache-bigtop-plugin.hdfs.installed')
@when('bigtop.available', 'hadoop-plugin.joined', 'namenode.joined', 'resourcemanager.joined')
@when_not('apache-bigtop-plugin.yarn.installed')
def install_hadoop_client_yarn(principal, namenode, resourcemanager):
if namenode.namenodes() and resourcemanager.resourcemanagers():
hookenv.status_set('maintenance', 'installing plugin (yarn)')
nn_host = namenode.namenodes()[0]
rm_host = resourcemanager.resourcemanagers()[0]
bigtop = Bigtop()
hosts = {'namenode': nn_host, 'resourcemanager': rm_host}
bigtop.render_site_yaml(hosts=hosts, roles='hadoop-client')
bigtop.trigger_puppet()
set_state('apache-bigtop-plugin.yarn.installed')
hookenv.status_set('active', 'ready (HDFS & YARN)')
else:
hookenv.status_set('waiting', 'waiting for master fqdns')
@when('apache-bigtop-plugin.yarn.installed')
@when('hadoop-plugin.joined', 'resourcemanager.joined')
@when_not('resourcemanager.ready')
def send_rm_spec(principal, resourcemanager):
"""Send our plugin spec so the resourcemanager can become ready."""
bigtop = Bigtop()
resourcemanager.set_local_spec(bigtop.spec())
@when('apache-bigtop-plugin.yarn.installed')
@when('hadoop-plugin.joined', 'resourcemanager.ready')
@when_not('apache-bigtop-plugin.yarn.ready')
def send_principal_yarn_info(principal, resourcemanager):
"""Send YARN data when the resourcemanager becomes ready."""
version = get_hadoop_version()
principal.set_installed(version)
principal.set_yarn_ready(
resourcemanager.resourcemanagers(), resourcemanager.port(),
resourcemanager.hs_http(), resourcemanager.hs_ipc())
set_state('apache-bigtop-plugin.yarn.ready')
@when('apache-bigtop-plugin.yarn.ready')
@when('hadoop-plugin.joined')
@when_not('resourcemanager.ready')
def clear_yarn_ready(principal):
principal.clear_yarn_ready()
remove_state('apache-bigtop-plugin.yarn.ready')
remove_state('apache-bigtop-plugin.yarn.installed')
@when_any('apache-bigtop-plugin.hdfs.installed', 'apache-bigtop-plugin.yarn.installed')
@when('hadoop-plugin.joined')
@when_none('namenode.spec.mismatch', 'resourcemanager.spec.mismatch')
def update_status(principal):
hdfs_rel = is_state('namenode.joined')
yarn_rel = is_state('resourcemanager.joined')
hdfs_ready = is_state('namenode.ready')
yarn_ready = is_state('resourcemanager.ready')
if not (hdfs_rel or yarn_rel):
hookenv.status_set('blocked',
'missing namenode and/or resourcemanager relation')
elif hdfs_rel and not hdfs_ready:
hookenv.status_set('waiting', 'waiting for hdfs')
elif yarn_rel and not yarn_ready:
hookenv.status_set('waiting', 'waiting for yarn')
else:
ready = []
if hdfs_ready:
ready.append('hdfs')
if yarn_ready:
ready.append('yarn')
hookenv.status_set('active', 'ready ({})'.format(' & '.join(ready)))
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