Plain Hadoop (vanilla) provisioning plugin for Sahara
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# Copyright (c) 2014 Mirantis Inc.
#
# Licensed 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 sahara.plugins import exceptions as ex
from sahara.plugins import utils as u
from sahara_plugin_vanilla.i18n import _
from sahara_plugin_vanilla.plugins.vanilla.hadoop2 import config_helper as cu
from sahara_plugin_vanilla.plugins.vanilla import utils as vu
def validate_cluster_creating(pctx, cluster):
nn_count = _get_inst_count(cluster, 'namenode')
if nn_count != 1:
raise ex.InvalidComponentCountException('namenode', 1, nn_count)
snn_count = _get_inst_count(cluster, 'secondarynamenode')
if snn_count > 1:
raise ex.InvalidComponentCountException('secondarynamenode',
_('0 or 1'), snn_count)
rm_count = _get_inst_count(cluster, 'resourcemanager')
if rm_count > 1:
raise ex.InvalidComponentCountException('resourcemanager', _('0 or 1'),
rm_count)
hs_count = _get_inst_count(cluster, 'historyserver')
if hs_count > 1:
raise ex.InvalidComponentCountException('historyserver', _('0 or 1'),
hs_count)
nm_count = _get_inst_count(cluster, 'nodemanager')
if rm_count == 0:
if nm_count > 0:
raise ex.RequiredServiceMissingException('resourcemanager',
required_by='nodemanager')
oo_count = _get_inst_count(cluster, 'oozie')
dn_count = _get_inst_count(cluster, 'datanode')
if oo_count > 1:
raise ex.InvalidComponentCountException('oozie', _('0 or 1'), oo_count)
if oo_count == 1:
if dn_count < 1:
raise ex.RequiredServiceMissingException('datanode',
required_by='oozie')
if nm_count < 1:
raise ex.RequiredServiceMissingException('nodemanager',
required_by='oozie')
if hs_count != 1:
raise ex.RequiredServiceMissingException('historyserver',
required_by='oozie')
spark_hist_count = _get_inst_count(cluster, 'spark history server')
if spark_hist_count > 1:
raise ex.InvalidComponentCountException('spark history server',
_('0 or 1'),
spark_hist_count)
rep_factor = cu.get_config_value(pctx, 'HDFS', 'dfs.replication', cluster)
if dn_count < rep_factor:
raise ex.InvalidComponentCountException(
'datanode', rep_factor, dn_count, _('Number of datanodes must be '
'not less than '
'dfs.replication.'))
hive_count = _get_inst_count(cluster, 'hiveserver')
if hive_count > 1:
raise ex.InvalidComponentCountException('hive', _('0 or 1'),
hive_count)
zk_count = _get_inst_count(cluster, 'zookeeper')
if zk_count > 0 and (zk_count % 2) != 1:
raise ex.InvalidComponentCountException(
'zookeeper', _('odd'), zk_count, _('Number of zookeeper nodes '
'should be odd.'))
def validate_additional_ng_scaling(cluster, additional):
rm = vu.get_resourcemanager(cluster)
scalable_processes = _get_scalable_processes()
for ng_id in additional:
ng = u.get_by_id(cluster.node_groups, ng_id)
if not set(ng.node_processes).issubset(scalable_processes):
msg = _("Vanilla plugin cannot scale nodegroup with processes: %s")
raise ex.NodeGroupCannotBeScaled(ng.name,
msg % ' '.join(ng.node_processes))
if not rm and 'nodemanager' in ng.node_processes:
msg = _("Vanilla plugin cannot scale node group with processes "
"which have no master-processes run in cluster")
raise ex.NodeGroupCannotBeScaled(ng.name, msg)
def validate_existing_ng_scaling(pctx, cluster, existing):
scalable_processes = _get_scalable_processes()
dn_to_delete = 0
for ng in cluster.node_groups:
if ng.id in existing:
if ng.count > existing[ng.id] and "datanode" in ng.node_processes:
dn_to_delete += ng.count - existing[ng.id]
if not set(ng.node_processes).issubset(scalable_processes):
msg = _("Vanilla plugin cannot scale nodegroup "
"with processes: %s")
raise ex.NodeGroupCannotBeScaled(
ng.name, msg % ' '.join(ng.node_processes))
dn_amount = len(vu.get_datanodes(cluster))
rep_factor = cu.get_config_value(pctx, 'HDFS', 'dfs.replication', cluster)
if dn_to_delete > 0 and dn_amount - dn_to_delete < rep_factor:
msg = _("Vanilla plugin cannot shrink cluster because it would be "
"not enough nodes for replicas (replication factor is %s)")
raise ex.ClusterCannotBeScaled(
cluster.name, msg % rep_factor)
def validate_zookeeper_node_count(zk_ng, existing, additional):
zk_amount = 0
for ng in zk_ng:
if ng.id in existing:
zk_amount += existing[ng.id]
else:
zk_amount += ng.count
for ng_id in additional:
ng = u.get_by_id(zk_ng, ng_id)
if "zookeeper" in ng.node_processes:
zk_amount += ng.count
if (zk_amount % 2) != 1:
msg = _("Vanilla plugin cannot scale cluster because it must keep"
" zookeeper service in odd.")
raise ex.ClusterCannotBeScaled(zk_ng[0].cluster.name, msg)
def _get_scalable_processes():
return ['datanode', 'nodemanager', 'zookeeper']
def _get_inst_count(cluster, process):
return sum([ng.count for ng in u.get_node_groups(cluster, process)])