303 lines
9.9 KiB
Python
303 lines
9.9 KiB
Python
# Copyright 2016 Hewlett Packard Enterprise Development Company LP
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import os
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import psutil
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import signal
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import socket
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import subprocess
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import sys
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import threading
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import time
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import traceback
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from oslo_config import cfg
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from oslo_log import log
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from oslo_service import loopingcall
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from oslo_service import service as os_service
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from tooz import coordination
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from monasca_transform.config.config_initializer import ConfigInitializer
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from monasca_transform.log_utils import LogUtils
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CONF = cfg.CONF
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SPARK_SUBMIT_PROC_NAME = "spark-submit"
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def main():
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transform_service = TransformService()
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transform_service.start()
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def shutdown_all_threads_and_die():
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"""Shut down all threads and exit process.
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Hit it with a hammer to kill all threads and die.
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"""
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LOG = log.getLogger(__name__)
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LOG.info('Monasca Transform service stopping...')
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os._exit(1)
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def get_process(proc_name):
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"""Get process given string in
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process cmd line.
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"""
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LOG = log.getLogger(__name__)
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proc = None
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try:
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for pr in psutil.process_iter():
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for args in pr.cmdline():
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if proc_name in args.split(" "):
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proc = pr
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return proc
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except BaseException:
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# pass
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LOG.error("Error fetching {%s} process..." % proc_name)
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return None
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def stop_spark_submit_process():
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"""Stop spark submit program."""
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LOG = log.getLogger(__name__)
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try:
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# get the driver proc
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pr = get_process(SPARK_SUBMIT_PROC_NAME)
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if pr:
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# terminate (SIGTERM) spark driver proc
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for cpr in pr.children(recursive=False):
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LOG.info("Terminate child pid {%s} ..." % str(cpr.pid))
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cpr.terminate()
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# terminate spark submit proc
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LOG.info("Terminate pid {%s} ..." % str(pr.pid))
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pr.terminate()
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except Exception as e:
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LOG.error("Error killing spark submit "
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"process: got exception: {%s}" % str(e))
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class Transform(os_service.Service):
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"""Class used with Openstack service.
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"""
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LOG = log.getLogger(__name__)
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def __init__(self, threads=1):
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super(Transform, self).__init__(threads)
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def signal_handler(self, signal_number, stack_frame):
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# Catch stop requests and appropriately shut down
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shutdown_all_threads_and_die()
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def start(self):
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try:
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# Register to catch stop requests
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signal.signal(signal.SIGTERM, self.signal_handler)
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main()
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except BaseException:
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self.LOG.exception("Monasca Transform service "
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"encountered fatal error. "
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"Shutting down all threads and exiting")
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shutdown_all_threads_and_die()
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def stop(self):
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stop_spark_submit_process()
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super(os_service.Service, self).stop()
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class TransformService(threading.Thread):
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previously_running = False
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LOG = log.getLogger(__name__)
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def __init__(self):
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super(TransformService, self).__init__()
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self.coordinator = None
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self.group = CONF.service.coordinator_group
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# A unique name used for establishing election candidacy
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self.my_host_name = socket.getfqdn()
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# periodic check
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leader_check = loopingcall.FixedIntervalLoopingCall(
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self.periodic_leader_check)
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leader_check.start(interval=float(
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CONF.service.election_polling_frequency))
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def check_if_still_leader(self):
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"""Return true if the this host is the
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leader
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"""
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leader = None
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try:
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leader = self.coordinator.get_leader(self.group).get()
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except BaseException:
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self.LOG.info('No leader elected yet for group %s' %
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(self.group))
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if leader and self.my_host_name == leader:
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return True
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# default
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return False
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def periodic_leader_check(self):
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self.LOG.debug("Called periodic_leader_check...")
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try:
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if self.previously_running:
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if not self.check_if_still_leader():
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# stop spark submit process
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stop_spark_submit_process()
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# stand down as a leader
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try:
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self.coordinator.stand_down_group_leader(
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self.group)
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except BaseException as e:
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self.LOG.info("Host %s cannot stand down as "
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"leader for group %s: "
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"got exception {%s}" %
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(self.my_host_name, self.group,
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str(e)))
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# reset state
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self.previously_running = False
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except BaseException as e:
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self.LOG.info("periodic_leader_check: "
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"caught unhandled exception: {%s}" % str(e))
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def when_i_am_elected_leader(self, event):
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"""Callback when this host gets elected leader."""
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# set running state
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self.previously_running = True
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self.LOG.info("Monasca Transform service running on %s "
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"has been elected leader" % str(self.my_host_name))
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if CONF.service.spark_python_files:
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pyfiles = (" --py-files %s"
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% CONF.service.spark_python_files)
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else:
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pyfiles = ''
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event_logging_dest = ''
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if (CONF.service.spark_event_logging_enabled and
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CONF.service.spark_event_logging_dest):
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event_logging_dest = (
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"--conf spark.eventLog.dir="
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"file://%s" %
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CONF.service.spark_event_logging_dest)
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# Build the command to start the Spark driver
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spark_cmd = "".join((
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"export SPARK_HOME=",
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CONF.service.spark_home,
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" && ",
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"spark-submit --master ",
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CONF.service.spark_master_list,
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" --conf spark.eventLog.enabled=",
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CONF.service.spark_event_logging_enabled,
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event_logging_dest,
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" --jars " + CONF.service.spark_jars_list,
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pyfiles,
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" " + CONF.service.spark_driver))
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# Start the Spark driver
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# (specify shell=True in order to
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# correctly handle wildcards in the spark_cmd)
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subprocess.call(spark_cmd, shell=True)
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def run(self):
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self.LOG.info('The host of this Monasca Transform service is ' +
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self.my_host_name)
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# Loop until the service is stopped
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while True:
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try:
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self.previously_running = False
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# Start an election coordinator
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self.coordinator = coordination.get_coordinator(
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CONF.service.coordinator_address, self.my_host_name)
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self.coordinator.start()
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# Create a coordination/election group
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try:
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request = self.coordinator.create_group(self.group)
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request.get()
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except coordination.GroupAlreadyExist:
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self.LOG.info('Group %s already exists' % self.group)
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# Join the coordination/election group
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try:
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request = self.coordinator.join_group(self.group)
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request.get()
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except coordination.MemberAlreadyExist:
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self.LOG.info('Host already joined to group %s as %s' %
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(self.group, self.my_host_name))
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# Announce the candidacy and wait to be elected
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self.coordinator.watch_elected_as_leader(
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self.group,
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self.when_i_am_elected_leader)
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while self.previously_running is False:
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self.LOG.debug('Monasca Transform service on %s is '
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'checking election results...'
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% self.my_host_name)
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self.coordinator.heartbeat()
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self.coordinator.run_watchers()
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if self.previously_running is True:
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try:
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# Leave/exit the coordination/election group
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request = self.coordinator.leave_group(self.group)
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request.get()
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except coordination.MemberNotJoined:
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self.LOG.info("Host has not yet "
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"joined group %s as %s" %
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(self.group, self.my_host_name))
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time.sleep(float(CONF.service.election_polling_frequency))
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self.coordinator.stop()
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except BaseException as e:
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# catch any unhandled exception and continue
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self.LOG.info("Ran into unhandled exception: {%s}" % str(e))
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self.LOG.info("Going to restart coordinator again...")
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traceback.print_exc()
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def main_service():
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"""Method to use with Openstack service.
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"""
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ConfigInitializer.basic_config()
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LogUtils.init_logger(__name__)
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launcher = os_service.ServiceLauncher(cfg.CONF)
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launcher.launch_service(Transform())
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launcher.wait()
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# Used if run without Openstack service.
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if __name__ == "__main__":
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sys.exit(main())
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