def serve_client(zk, client):
'''
We may have multiple HBase peers, but we only need to send 1 set of
connection data. Leverage Juju leadership to only send the leader
info (even if it's not the actual HBase master).
Zookeeper will ensure that any HBase peer routes requests to the
appropriate master.
'''
hbase = HBase()
# Get hbase config and zk info
config = get_layer_opts()
host = hookenv.unit_private_ip()
master_port = config.port('hbase-master')
regionserver_port = config.port('hbase-region')
thrift_port = config.port('hbase-thrift')
zk_connect = hbase.get_zk_connect(zk.zookeepers())
# Send data to our connected client
client.send_connection(master_port=master_port,
regionserver_port=regionserver_port,
thrift_port=thrift_port,
host=host,
zk_connect=zk_connect)
hookenv.log('Serving HBase client with master {}:{}, regionserver '
'port {}, thrift port {}, and zk connect {}'.format(
host, master_port, regionserver_port, thrift_port,
zk_connect))
def install_hbase(hdfs, zk):
'''
Anytime our dependencies are available, check to see if we have a valid
reason to (re)install. These include:
- initial install
- config change
- Zookeeper unit has joined/departed
'''
zks = zk.zookeepers()
deployment_matrix = {
'zookeepers': zks,
}
# Handle nuances when installing versus re-installing
if not is_state('hbase.installed'):
prefix = "installing"
# On initial install, prime our kv with the current deployment matrix.
# Subsequent calls will use this to determine if a reinstall is needed.
data_changed('deployment_matrix', deployment_matrix)
else:
prefix = "configuring"
# We do not need to reinstall when peers come and go; that is covered
# by other handlers below.
if is_state('hbpeer.departed') or is_state('hbpeer.joined'):
return
# Return if neither config nor our matrix has changed
if not (is_state('config.changed')
or data_changed('deployment_matrix', deployment_matrix)):
return
hookenv.status_set('maintenance', '{} hbase'.format(prefix))
hookenv.log("{} hbase with: {}".format(prefix, deployment_matrix))
hbase = HBase()
hosts = {}
hosts['namenode'] = hdfs.namenodes()[0]
hbase.configure(hosts, zks)
# Ensure our IP is in the regionservers list; restart if the rs conf
# file has changed.
hbase.update_regionservers([hookenv.unit_private_ip()])
if any_file_changed(['/etc/hbase/conf/regionservers']):
hbase.restart()
# set app version string for juju status output
hbase_version = get_package_version('hbase-master') or 'unknown'
hookenv.application_version_set(hbase_version)
hbase.open_ports()
report_status()
set_state('hbase.installed')
def installing_hbase(zk, hdfs):
zks = zk.zookeepers()
if is_state('hbase.installed') and (not data_changed('zks', zks)):
return
msg = "configuring hbase" if is_state('hbase.installed') else "installing hbase"
hookenv.status_set('maintenance', msg)
hbase = HBase()
hosts = {}
nns = hdfs.namenodes()
hosts['namenode'] = nns[0]
hbase.configure(hosts, zks)
hbase.open_ports()
set_state('hbase.installed')
hookenv.status_set('active', 'ready')
def stop_hbase():
'''
HBase depends on HDFS and Zookeeper. If we are installed and either of
these dependencies go away, shut down HBase services and remove our
installed state.
'''
hbase = HBase()
hbase.close_ports()
hbase.stop()
remove_state('hbase.installed')
report_status()
def installing_hbase(zk, hdfs):
zks = zk.zookeepers()
if is_state('hbase.installed') and (not data_changed('zks', zks)):
return
msg = "configuring hbase" if is_state(
'hbase.installed') else "installing hbase"
hookenv.status_set('maintenance', msg)
hbase = HBase()
hosts = {}
nns = hdfs.namenodes()
hosts['namenode'] = nns[0]
hbase.configure(hosts, zks)
hbase.open_ports()
set_state('hbase.installed')
hookenv.status_set('active', 'ready')
def handle_peers():
'''
We use HBase peers to keep track of the RegionServer IP addresses in a
cluster. Use get_nodes() from the appropriate peer relation to retrieve
a list of peer tuples, e.g.:
[('hbase/0', '172.31.5.161'), ('hbase/2', '172.31.5.11')]
Depending on the state, this handler will add or remove peer IP addresses
from the regionservers config file.
'''
if is_state('hbpeer.departed'):
hbpeer = RelationBase.from_state('hbpeer.departed')
is_departing = True
message = 'removing hbase peer(s)'
else:
hbpeer = RelationBase.from_state('hbpeer.joined')
is_departing = False
message = 'adding hbase peer(s)'
# Make sure we have a valid relation object
if hbpeer:
nodes = hbpeer.get_nodes()
else:
hookenv.log('Ignoring unknown HBase peer state')
return
hookenv.status_set('maintenance', message)
hbase = HBase()
ip_addrs = [node[1] for node in nodes]
hookenv.log('{}: {}'.format(message, ip_addrs))
hbase.update_regionservers(ip_addrs, remove=is_departing)
# NB: the rs conf file will always change when handling peer updates, but
# we still include this condition to keep the files_changed kv current.
if any_file_changed(['/etc/hbase/conf/regionservers']):
hbase.restart()
# Dismiss appropriate state now that we've handled the peer
if is_departing:
hbpeer.dismiss_departed()
else:
hbpeer.dismiss_joined()
report_status()
def install_hbase(zk, hdfs):
zks = zk.zookeepers()
if (is_state('hbase.installed') and
(not data_changed('zks', zks))):
return
msg = "configuring hbase" if is_state('hbase.installed') else "installing hbase"
hookenv.status_set('maintenance', msg)
hbase = HBase()
hosts = {}
nns = hdfs.namenodes()
hosts['namenode'] = nns[0]
hbase.configure(hosts, zks)
hbase.open_ports()
set_state('hbase.installed')
report_status()
# set app version string for juju status output
hbase_version = get_package_version('hbase-master') or 'unknown'
hookenv.application_version_set(hbase_version)
def stop_hbase():
hbase = HBase()
hbase.close_ports()
hbase.stop()
remove_state('hbase.installed')
report_status()
def stop_hbase():
hbase = HBase()
hbase.close_ports()
hbase.stop()
remove_state('hbase.installed')
report_status()