146 lines
5.0 KiB
Python
146 lines
5.0 KiB
Python
# Copyright (c) 2016 Mirantis Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import functools
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from oslo_log import log as logging
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import six
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from sahara.i18n import _
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from sahara.service.health import health_check_base
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LOG = logging.getLogger(__name__)
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class HealthStatusProvider(object):
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def __init__(self, cluster, cloudera_tools):
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self.cluster = cluster
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self.cloudera_tools = cloudera_tools
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self._data = None
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self._cluster_services = None
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self._exception_store = None
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self.get_health_status()
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def get_cluster_services(self):
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return self._cluster_services
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def is_cloudera_active(self):
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if self._exception_store:
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raise health_check_base.RedHealthError(self._exception_store)
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return _("Cloudera Manager is Active")
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def get_cloudera_health(self):
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cu = self.cloudera_tools
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api = cu.get_api_client(self.cluster)
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return api.get_service_health_status(self.cluster.name)
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def get_important_services(self):
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# will be overridable in future
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cu = self.cloudera_tools
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return [
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cu.HDFS_SERVICE_NAME,
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cu.YARN_SERVICE_NAME,
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cu.OOZIE_SERVICE_NAME
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]
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def get_health_status(self, service=None):
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if self._data is not None:
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return self._data.get(service, []) if service else self._data
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self._data = {}
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self._cluster_services = []
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try:
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# all data already grouped by services
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self._data = self.get_cloudera_health()
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self._cluster_services = self._data.keys()
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except Exception as e:
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msg = _("Can't get response from Cloudera "
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"Manager")
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LOG.exception(msg)
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self._exception_store = _(
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"%(problem)s, reason: %(reason)s") % {
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'problem': msg, 'reason': six.text_type(e)}
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class ClouderaManagerHealthCheck(health_check_base.BasicHealthCheck):
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def __init__(self, cluster, provider):
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self.provider = provider
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super(ClouderaManagerHealthCheck, self).__init__(cluster)
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def get_health_check_name(self):
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return _("Cloudera Manager health check")
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def is_available(self):
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return self.cluster.plugin_name == 'cdh'
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def check_health(self):
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return self.provider.is_cloudera_active()
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class ServiceHealthCheck(health_check_base.BasicHealthCheck):
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def __init__(self, cluster, provider, service):
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self.provider = provider
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self.service = service
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super(ServiceHealthCheck, self).__init__(cluster)
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def get_health_check_name(self):
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return _("CDH %s health check") % self.service
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def is_available(self):
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return self.cluster.plugin_name == 'cdh'
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def check_health(self):
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important_services = self.provider.get_important_services()
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observed_data = self.provider.get_health_status(self.service)
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imp_map = {'BAD': 'red', 'CONCERNING': 'yellow', 'GOOD': 'green'}
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summary = observed_data['summary']
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checks = observed_data.get('checks', [])
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failed_checks = []
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for check in checks:
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if check['summary'] != 'GOOD':
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failed_checks.append('%(name)s - %(summary)s state' % {
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'name': check['name'], 'summary': check['summary']
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})
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additional_info = None
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if failed_checks:
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additional_info = _(
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"The following checks did not pass: %s") % ",".join(
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failed_checks)
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if self.service in important_services:
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overall = imp_map.get(summary, 'red')
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else:
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overall = 'green'
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if summary != 'GOOD':
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overall = 'yellow'
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msg = _("Cloudera Manager has responded that service is in "
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"the %s state") % summary
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if additional_info:
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msg = _("%(problem)s. %(description)s") % {
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'problem': msg, 'description': additional_info}
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if overall == 'red':
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raise health_check_base.RedHealthError(msg)
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elif overall == 'yellow':
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raise health_check_base.YellowHealthError(msg)
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return msg
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def get_health_checks(cluster, cloudera_utils):
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provider = HealthStatusProvider(cluster, cloudera_utils)
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checks = [functools.partial(
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ClouderaManagerHealthCheck, provider=provider)]
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for service in provider.get_cluster_services():
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checks.append(functools.partial(
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ServiceHealthCheck, provider=provider, service=service))
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return checks
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