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From Demian Calcaprina <calcacue...@gmail.com>
Subject Multiple timeout issues
Date Thu, 17 Nov 2016 18:06:17 GMT
Hi All,

I am facing some strange issues, probably because I am making something
wrong.

Basically, I need to create kafka topics dynamically, post some messages
there and after some time, remove the topic.

1) For creating the topic
private static final int KAFKA_CONNECT_TIMEOUT = 10000;
private static final int KAFKA_DEFAULT_TOPIC_PARTITIONS = 10;
private static final int KAFKA_DEFAULT_TOPIC_REPLICATION = 1;

public static void createTopic(String brokerConnect, String topic) {
ZkUtils utils = createZkUtils(brokerConnect);
AdminUtils.createTopic(utils, topic, KAFKA_DEFAULT_TOPIC_PARTITIONS,
KAFKA_DEFAULT_TOPIC_REPLICATION, new Properties());
}
private static ZkUtils createZkUtils(String brokerConnect) {
ZkClient zkClient = new ZkClient(brokerConnect, KAFKA_CONNECT_TIMEOUT,
KAFKA_CONNECT_TIMEOUT, ZKStringSerializer$.MODULE$);
ZkUtils utils = new ZkUtils(zkClient, new ZkConnection(brokerConnect),
false);
return utils;
}

2) For creating the consumer:
    private static ConsumerConfig createConsumerConfig(String zookeeper,
String groupId, long consumerTimeout) {
        Properties props = new Properties();
        props.put("zookeeper.connect", zookeeper);
        props.put("group.id", groupId);
        props.put("zookeeper.session.timeout.ms", "6000");
        props.put("zookeeper.sync.time.ms", "200");
        props.put("auto.commit.interval.ms", "1000");

        return new ConsumerConfig(props);
    }

3) For removing the topic
public static void deleteTopic(String brokerConnect, String topic) {
ZkUtils utils = createZkUtils(brokerConnect);
AdminUtils.deleteTopic(utils, topic);
}


What I see is that after some not much time for creating/deleting topics, I
start seeing timeouts creating the consumers, or creating the ZK utils,
like this:

Caused by: org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to
connect to zookeeper server within timeout: 10000
at org.I0Itec.zkclient.ZkClient.connect(ZkClient.java:1223)
~[zkclient-0.7.jar:0.7]
at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:155)
~[zkclient-0.7.jar:0.7]
at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:129)
~[zkclient-0.7.jar:0.7]
at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:96)
~[zkclient-0.7.jar:0.7]


And I see it many times.

Is this expected? Can I do something better to improve this?

Appreciate any feedback,

Demian

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