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 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()