147 lines
5.0 KiB
Python
147 lines
5.0 KiB
Python
import logging
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import os
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import time
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from . import unittest
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from kafka import * # noqa
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from kafka.common import * # noqa
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from kafka.producer import Producer
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from .fixtures import ZookeeperFixture, KafkaFixture
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from .testutil import *
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class TestFailover(KafkaIntegrationTestCase):
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create_client = False
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@classmethod
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def setUpClass(cls): # noqa
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if not os.environ.get('KAFKA_VERSION'):
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return
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zk_chroot = random_string(10)
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replicas = 2
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partitions = 2
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# mini zookeeper, 2 kafka brokers
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cls.zk = ZookeeperFixture.instance()
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kk_args = [cls.zk.host, cls.zk.port, zk_chroot, replicas, partitions]
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cls.brokers = [KafkaFixture.instance(i, *kk_args) for i in range(replicas)]
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hosts = ['%s:%d' % (b.host, b.port) for b in cls.brokers]
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cls.client = KafkaClient(hosts)
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@classmethod
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def tearDownClass(cls):
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if not os.environ.get('KAFKA_VERSION'):
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return
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cls.client.close()
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for broker in cls.brokers:
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broker.close()
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cls.zk.close()
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@kafka_versions("all")
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def test_switch_leader(self):
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key, topic, partition = random_string(5), self.topic, 0
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# Test the base class Producer -- send_messages to a specific partition
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producer = Producer(self.client, async=False)
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# Send 10 random messages
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self._send_random_messages(producer, topic, partition, 10)
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# kill leader for partition
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broker = self._kill_leader(topic, partition)
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# expect failure, but dont wait more than 60 secs to recover
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recovered = False
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started = time.time()
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timeout = 60
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while not recovered and (time.time() - started) < timeout:
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try:
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logging.debug("attempting to send 'success' message after leader killed")
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producer.send_messages(topic, partition, 'success')
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logging.debug("success!")
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recovered = True
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except (FailedPayloadsError, ConnectionError):
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logging.debug("caught exception sending message -- will retry")
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continue
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# Verify we successfully sent the message
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self.assertTrue(recovered)
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# send some more messages to new leader
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self._send_random_messages(producer, topic, partition, 10)
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# count number of messages
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count = self._count_messages('test_switch_leader group', topic,
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partitions=(partition,))
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# Should be equal to 10 before + 1 recovery + 10 after
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self.assertEquals(count, 21)
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#@kafka_versions("all")
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@unittest.skip("async producer does not support reliable failover yet")
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def test_switch_leader_async(self):
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key, topic, partition = random_string(5), self.topic, 0
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# Test the base class Producer -- send_messages to a specific partition
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producer = Producer(self.client, async=True)
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# Send 10 random messages
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self._send_random_messages(producer, topic, partition, 10)
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# kill leader for partition
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broker = self._kill_leader(topic, partition)
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logging.debug("attempting to send 'success' message after leader killed")
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# in async mode, this should return immediately
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producer.send_messages(topic, partition, 'success')
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# send to new leader
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self._send_random_messages(producer, topic, partition, 10)
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# wait until producer queue is empty
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while not producer.queue.empty():
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time.sleep(0.1)
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producer.stop()
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# count number of messages
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count = self._count_messages('test_switch_leader_async group', topic,
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partitions=(partition,))
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# Should be equal to 10 before + 1 recovery + 10 after
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self.assertEquals(count, 21)
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def _send_random_messages(self, producer, topic, partition, n):
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for j in range(n):
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logging.debug('_send_random_message to %s:%d -- try %d', topic, partition, j)
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resp = producer.send_messages(topic, partition, random_string(10))
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if len(resp) > 0:
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self.assertEquals(resp[0].error, 0)
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logging.debug('_send_random_message to %s:%d -- try %d success', topic, partition, j)
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def _kill_leader(self, topic, partition):
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leader = self.client.topics_to_brokers[TopicAndPartition(topic, partition)]
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broker = self.brokers[leader.nodeId]
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broker.close()
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return broker
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def _count_messages(self, group, topic, timeout=1, partitions=None):
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hosts = ','.join(['%s:%d' % (broker.host, broker.port)
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for broker in self.brokers])
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client = KafkaClient(hosts)
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consumer = SimpleConsumer(client, group, topic,
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partitions=partitions,
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auto_commit=False,
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iter_timeout=timeout)
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count = consumer.pending(partitions)
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consumer.stop()
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client.close()
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return count
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