def _check_decommission(cluster, instances, check_func, timeout):
s_time = timeutils.utcnow()
while timeutils.delta_seconds(s_time, timeutils.utcnow()) < timeout:
statuses = check_func(cluster)
dec_ok = True
for instance in instances:
if statuses[instance.fqdn()] != 'decommissioned':
dec_ok = False
if dec_ok:
return
else:
context.sleep(5)
else:
ex.DecommissionError(
_("Cannot finish decommission of cluster %(cluster)s in "
"%(seconds)d seconds") % {
"cluster": cluster,
"seconds": timeout
})
def decommission_dn(nn, inst_to_be_deleted, survived_inst):
with remote.get_remote(nn) as r:
r.write_file_to('/etc/hadoop/dn.excl',
utils.generate_fqdn_host_names(inst_to_be_deleted))
run.refresh_nodes(remote.get_remote(nn), "dfsadmin")
context.sleep(3)
timeout = config_helper.get_decommissioning_timeout(
nn.node_group.cluster)
s_time = timeutils.utcnow()
all_found = False
while timeutils.delta_seconds(s_time, timeutils.utcnow()) < timeout:
cmd = r.execute_command(
"sudo su -c 'hadoop dfsadmin -report' hadoop")
all_found = True
datanodes_info = parse_dfs_report(cmd[1])
for i in inst_to_be_deleted:
for dn in datanodes_info:
if (dn["Name"].startswith(i.internal_ip)) and (
dn["Decommission Status"] != "Decommissioned"):
all_found = False
break
if all_found:
r.write_files_to({
'/etc/hadoop/dn.incl':
utils.generate_fqdn_host_names(survived_inst),
'/etc/hadoop/dn.excl':
"",
})
break
context.sleep(3)
if not all_found:
ex.DecommissionError(
_("Cannot finish decommission of cluster %(cluster)s in "
"%(seconds)d seconds") % {
"cluster": nn.node_group.cluster,
"seconds": timeout
})
def decommission_cluster_instances(self, cluster, clusterspec, instances,
ambari_info):
request_uri = self._get_command_request_uri(ambari_info, cluster.name)
hosts_to_decommission = []
# Decommission HDFS datanodes to avoid loss of data
# during decommissioning process
for instance in instances:
ng_name = instance.node_group.name
if "DATANODE" in clusterspec.node_groups[ng_name].components:
# determine the instances that include HDFS support
hosts_to_decommission.append(instance.fqdn())
LOG.debug('AmbariClient: hosts_to_decommission = ' +
str(hosts_to_decommission))
# template for request body
body_header = ('{"RequestInfo" : { "context": "Decommission DataNode",'
' "command" : "DECOMMISSION", "service_name" : "HDFS",'
' "component_name" : "NAMENODE", '
' "parameters" : { "slave_type" : "DATANODE", ')
excluded_hosts_request = '"excluded_hosts" : "{0}"'
# generate comma-separated list of hosts to de-commission
list_of_hosts = ",".join(hosts_to_decommission)
LOG.debug('AmbariClient: list_of_hosts = ' + list_of_hosts)
# create the request body
request_body = (
body_header + excluded_hosts_request.format(list_of_hosts) + '}}' +
', "Requests/resource_filters":[{"service_name":"HDFS",'
'"component_name":"NAMENODE"}]}')
LOG.debug('AmbariClient: about to make decommission request, uri = ' +
request_uri)
LOG.debug('AmbariClient: about to make decommission request, ' +
'request body = ' + request_body)
# ask Ambari to decommission the datanodes
result = self._post(request_uri, ambari_info, request_body)
if result.status_code != 202:
LOG.error(
_LE('AmbariClient: error while making decommission post '
'request. Error is = %s'), result.text)
raise ex.DecommissionError(
_('An error occurred while trying to '
'decommission the DataNode instances that are '
'being shut down. '
'Please consult the Ambari server logs on the '
'master node for '
'more information about the failure.'))
else:
LOG.info(_LI('AmbariClient: decommission post request succeeded!'))
status_template = ('http://{0}/api/v1/clusters/{1}/hosts/{2}/'
'host_components/{3}')
# find the host that the NameNode is deployed on
name_node_host = clusterspec.determine_component_hosts(
'NAMENODE').pop()
status_request = status_template.format(ambari_info.get_address(),
cluster.name,
name_node_host.fqdn(),
'NAMENODE')
LOG.debug('AmbariClient: about to make decommission status request,' +
'uri = ' + status_request)
count = 0
while count < 100 and len(hosts_to_decommission) > 0:
LOG.info(
_LI('AmbariClient: number of hosts waiting for '
'decommissioning to complete = %s'),
str(len(hosts_to_decommission)))
result = self._get(status_request, ambari_info)
if result.status_code != 200:
LOG.error(
_LE('AmbariClient: error in making decommission '
'status request, error = %s'), result.text)
else:
LOG.info(
_LI('AmbariClient: decommission status request ok, '
'result = %s'), result.text)
json_result = json.loads(result.text)
live_nodes = (
json_result['metrics']['dfs']['namenode']['LiveNodes'])
# parse out the map of live hosts associated with the NameNode
json_result_nodes = json.loads(live_nodes)
for node, val in six.iteritems(json_result_nodes):
admin_state = val['adminState']
if admin_state == 'Decommissioned':
LOG.info(
_LI('AmbariClient: node = %(node)s is '
'now in adminState = %(admin_state)s'), {
'node': node,
'admin_state': admin_state
})
# remove from list, to track which nodes
# are now in Decommissioned state
hosts_to_decommission.remove(node)
LOG.info(_LI('AmbariClient: sleeping for 5 seconds'))
context.sleep(5)
# increment loop counter
count += 1
if len(hosts_to_decommission) > 0:
LOG.error(
_LE('AmbariClient: decommissioning process timed-out '
'waiting for nodes to enter "Decommissioned" '
'status.'))
