def check_broker_id_in_zk(broker_id_policy, process, region):
"""
Check endlessly for the Zookeeper Connection.
This function checks endlessly if the broker is still registered in ZK
(we observered running brokers but missing broker id's so we implemented this check)
and if the ZK IP's changed (e.g. due to a node restart). If this happens a Kafka restart is enforced.
"""
from kazoo.client import KazooClient
zk_conn_str = os.getenv('ZOOKEEPER_CONN_STRING')
broker_id_manager = find_out_own_id.get_broker_policy(broker_id_policy)
broker_id = broker_id_manager.get_id(kafka_data_dir)
logging.info("check broker id... {}".format(broker_id))
if not broker_id:
broker_id = wait_for_broker_id(broker_id_manager, kafka_data_dir)
while True:
check_kafka(region)
new_zk_conn_str = generate_zk_conn_str.run(os.getenv('ZOOKEEPER_STACK_NAME'), region)
if zk_conn_str != new_zk_conn_str:
logging.warning("ZooKeeper connection string changed!")
logging.warning("new ZK: " + new_zk_conn_str)
logging.warning("old ZK: " + zk_conn_str)
zk_conn_str = new_zk_conn_str
os.environ['ZOOKEEPER_CONN_STRING'] = zk_conn_str
create_broker_properties(zk_conn_str)
from random import randint
wait_to_stop = randint(1, 10)
logging.info("Waiting " + str(wait_to_stop) + " seconds to stop kafka broker ...")
sleep(wait_to_stop)
process.terminate()
process.wait()
wait_to_restart = randint(10, 20)
logging.info("Waiting " + str(wait_to_restart) + " seconds to restart kafka broker ...")
sleep(wait_to_restart)
logging.info("Restarting kafka broker with new ZooKeeper connection string ...")
process = subprocess.Popen([kafka_dir + "/bin/kafka-server-start.sh",
kafka_dir + "/config/server.properties"])
os.environ['WAIT_FOR_KAFKA'] = 'yes'
continue
zk = KazooClient(hosts=zk_conn_str)
zk.start()
try:
zk.get("/brokers/ids/" + broker_id)
logging.info("I'm still in ZK registered, all good!")
sleep(60)
zk.stop()
except:
logging.warning("I'm not in ZK registered, stopping kafka broker process!")
zk.stop()
process.terminate()
process.wait()
logging.info("Restarting kafka broker ...")
process = subprocess.Popen([kafka_dir + "/bin/kafka-server-start.sh",
kafka_dir + "/config/server.properties"])
os.environ['WAIT_FOR_KAFKA'] = 'yes'
def check_broker_id_in_zk(broker_id, process):
"""
Check endlessly for the Zookeeper Connection.
This function checks endlessly if the broker is still registered in ZK
(we observered running brokers but missing broker id's so we implemented this check)
and if the ZK IP's changed (e.g. due to a node restart). If this happens a Kafka restart is enforced.
"""
import requests
from time import sleep
from kazoo.client import KazooClient
zk_conn_str = os.getenv('ZOOKEEPER_CONN_STRING')
while True:
if os.getenv('WAIT_FOR_KAFKA') != 'no':
ip = requests.get('http://169.254.169.254/latest/dynamic/instance-identity/document').json()['privateIp']
wait_for_kafka_startup.run(ip)
os.environ['WAIT_FOR_KAFKA'] = 'no'
new_zk_conn_str = generate_zk_conn_str.run(os.getenv('ZOOKEEPER_STACK_NAME'), region)
if zk_conn_str != new_zk_conn_str:
logging.warning("ZooKeeper connection string changed!")
logging.warning("new ZK: " + new_zk_conn_str)
logging.warning("old ZK: " + zk_conn_str)
zk_conn_str = new_zk_conn_str
os.environ['ZOOKEEPER_CONN_STRING'] = zk_conn_str
create_broker_properties(zk_conn_str)
from random import randint
wait_to_kill = randint(1, 10)
logging.info("Waiting " + str(wait_to_kill) + " seconds to kill kafka broker ...")
sleep(wait_to_kill)
process.kill()
wait_to_restart = randint(10, 20)
logging.info("Waiting " + str(wait_to_restart) + " seconds to restart kafka broker ...")
sleep(wait_to_restart)
logging.info("Restarting kafka broker with new ZooKeeper connection string ...")
process = subprocess.Popen([kafka_dir + "/bin/kafka-server-start.sh",
kafka_dir + "/config/server.properties"])
os.environ['WAIT_FOR_KAFKA'] = 'yes'
continue
zk = KazooClient(hosts=zk_conn_str)
zk.start()
try:
zk.get("/brokers/ids/" + broker_id)
logging.info("I'm still in ZK registered, all good!")
sleep(60)
zk.stop()
except:
logging.warning("I'm not in ZK registered, killing kafka broker process!")
zk.stop()
process.kill()
logging.info("Restarting kafka broker ...")
process = subprocess.Popen([kafka_dir + "/bin/kafka-server-start.sh",
kafka_dir + "/config/server.properties"])
os.environ['WAIT_FOR_KAFKA'] = 'yes'
def check_broker_id_in_zk(broker_id, process):
import requests
from time import sleep
from kazoo.client import KazooClient
zk_conn_str = os.getenv('ZOOKEEPER_CONN_STRING')
while True:
if os.getenv('WAIT_FOR_KAFKA') != 'no':
ip = requests.get(
'http://169.254.169.254/latest/dynamic/instance-identity/document'
).json()['privateIp']
wait_for_kafka_startup.run(ip)
os.environ['WAIT_FOR_KAFKA'] = 'no'
new_zk_conn_str = generate_zk_conn_str.run(
os.getenv('ZOOKEEPER_STACK_NAME'), region)
if zk_conn_str != new_zk_conn_str:
logging.warning("ZooKeeper connection string changed!")
zk_conn_str = new_zk_conn_str
os.environ['ZOOKEEPER_CONN_STRING'] = zk_conn_str
create_broker_properties(zk_conn_str)
from random import randint
wait_to_restart = randint(1, 20)
logging.info("Waiting " + str(wait_to_restart) +
" seconds to restart kafka broker ...")
sleep(wait_to_restart)
process.kill()
logging.info(
"Restarting kafka broker with new ZooKeeper connection string ..."
)
process = subprocess.Popen([
kafka_dir + "/bin/kafka-server-start.sh",
kafka_dir + "/config/server.properties"
])
os.environ['WAIT_FOR_KAFKA'] = 'yes'
continue
zk = KazooClient(hosts=zk_conn_str)
zk.start()
try:
zk.get("/brokers/ids/" + broker_id)
logging.info("I'm still in ZK registered, all good!")
sleep(60)
zk.stop()
except:
logging.warning(
"I'm not in ZK registered, killing kafka broker process!")
zk.stop()
process.kill()
logging.info("Restarting kafka broker ...")
process = subprocess.Popen([
kafka_dir + "/bin/kafka-server-start.sh",
kafka_dir + "/config/server.properties"
])
os.environ['WAIT_FOR_KAFKA'] = 'yes'
def check_broker_id_in_zk(broker_id, process):
import requests
from time import sleep
from kazoo.client import KazooClient
zk_conn_str = os.getenv("ZOOKEEPER_CONN_STRING")
while True:
if os.getenv("WAIT_FOR_KAFKA") != "no":
ip = requests.get("http://169.254.169.254/latest/dynamic/instance-identity/document").json()["privateIp"]
wait_for_kafka_startup.run(ip)
os.environ["WAIT_FOR_KAFKA"] = "no"
new_zk_conn_str = generate_zk_conn_str.run(os.getenv("ZOOKEEPER_STACK_NAME"), region)
if zk_conn_str != new_zk_conn_str:
logging.warning("ZooKeeper connection string changed!")
zk_conn_str = new_zk_conn_str
os.environ["ZOOKEEPER_CONN_STRING"] = zk_conn_str
create_broker_properties(zk_conn_str)
from random import randint
wait_to_restart = randint(1, 20)
logging.info("Waiting " + str(wait_to_restart) + " seconds to restart kafka broker ...")
sleep(wait_to_restart)
process.kill()
logging.info("Restarting kafka broker with new ZooKeeper connection string ...")
process = subprocess.Popen(
[kafka_dir + "/bin/kafka-server-start.sh", kafka_dir + "/config/server.properties"]
)
os.environ["WAIT_FOR_KAFKA"] = "yes"
continue
zk = KazooClient(hosts=zk_conn_str)
zk.start()
try:
zk.get("/brokers/ids/" + broker_id)
logging.info("I'm still in ZK registered, all good!")
sleep(60)
zk.stop()
except:
logging.warning("I'm not in ZK registered, killing kafka broker process!")
zk.stop()
process.kill()
logging.info("Restarting kafka broker ...")
process = subprocess.Popen(
[kafka_dir + "/bin/kafka-server-start.sh", kafka_dir + "/config/server.properties"]
)
os.environ["WAIT_FOR_KAFKA"] = "yes"
import generate_zk_conn_str
kafka_dir = os.getenv('KAFKA_DIR')
logging.basicConfig(level=getattr(logging, 'INFO', None))
try:
logging.info("Checking if we are on AWS or not ...")
response = requests.get('http://169.254.169.254/latest/dynamic/instance-identity/document', timeout=5)
json = response.json()
region = json['region']
except requests.exceptions.ConnectionError:
logging.info("Seems like this is a local environment, we will run now in local mode")
region = None
zk_conn_str = generate_zk_conn_str.run(os.getenv('ZOOKEEPER_STACK_NAME'), region)
os.environ['ZOOKEEPER_CONN_STRING'] = zk_conn_str
logging.info("Got ZooKeeper connection string: " + zk_conn_str)
def get_remote_config(file, url):
logging.info("getting " + file + " file from " + url)
file_ = open(file, 'w')
file_.write(requests.get(url).text)
file_.close
def create_broker_properties(zk_conn_str):
with open(kafka_dir + '/config/server.properties', "r+") as f:
lines = f.read().splitlines()
from multiprocessing import Pool
import wait_for_kafka_startup
import generate_zk_conn_str
kafka_dir = os.getenv('KAFKA_DIR')
logging.basicConfig(level=getattr(logging, 'INFO', None))
try:
response = requests.get('http://169.254.169.254/latest/dynamic/instance-identity/document')
json = response.json()
region = json['region']
except requests.exceptions.ConnectionError:
region = None
zk_conn_str = generate_zk_conn_str.run(os.getenv('ZOOKEEPER_STACK_NAME'), region)
os.environ['ZOOKEEPER_CONN_STRING'] = zk_conn_str
logging.info("Got ZooKeeper connection string: " + zk_conn_str)
def create_broker_properties(zk_conn_str):
with open(kafka_dir + '/config/server.properties', "r+") as f:
lines = f.read().splitlines()
f.seek(0)
f.truncate()
f.write('zookeeper.connect=' + zk_conn_str + '\n')
for line in lines:
if not line.startswith("zookeeper.connect"):
f.write(line + '\n')
f.close()
