未能在kafka-storm中将偏移数据写入zookeeper

Question

我正在设置一个风暴群来计算实时趋势和其他统计数据,但是我在将这个"恢复"功能引入到这个项目中时遇到了一些问题,允许上次读取的偏移量kafka-spout(源代码kafka-spout来自https: //github.com/apache/incubator-storm/tree/master/external/storm-kafka)值得记住.我kafka-spout以这种方式开始:

BrokerHosts zkHost = new ZkHosts("localhost:2181");
SpoutConfig kafkaConfig = new SpoutConfig(zkHost, "test", "", "test");
kafkaConfig.forceFromStart = false;
KafkaSpout kafkaSpout = new KafkaSpout(kafkaConfig);
TopologyBuilder builder = new TopologyBuilder();
builder.setSpout("test" + "spout", kafkaSpout, ESConfig.spoutParallelism);

默认设置应该这样做,但我认为在我的情况下它没有这样做,每次我启动我的项目时,PartitionManager尝试查找带有偏移量的文件,然后找不到任何内容:

2014-06-25 11:57:08 INFO  PartitionManager:73 - Read partition information from: /storm/partition_1  --> null
2014-06-25 11:57:08 INFO  PartitionManager:86 - No partition information found, using configuration to determine offset

然后它开始从最新的可能偏移读取.如果我的项目永远不会失败,那就没关系,但不完全是我想要的.

我还看了一下PartitionManager使用Zkstate类来编写偏移量的类,从这段代码片段:

PartitionManeger

public void commit() {
    long lastCompletedOffset = lastCompletedOffset();
    if (_committedTo != lastCompletedOffset) {
        LOG.debug("Writing last completed offset (" + lastCompletedOffset + ") to ZK for " + _partition + " for topology: " + _topologyInstanceId);
        Map<Object, Object> data = (Map<Object, Object>) ImmutableMap.builder()
                .put("topology", ImmutableMap.of("id", _topologyInstanceId,
                        "name", _stormConf.get(Config.TOPOLOGY_NAME)))
                .put("offset", lastCompletedOffset)
                .put("partition", _partition.partition)
                .put("broker", ImmutableMap.of("host", _partition.host.host,
                        "port", _partition.host.port))
                .put("topic", _spoutConfig.topic).build();
        _state.writeJSON(committedPath(), data);

        _committedTo = lastCompletedOffset;
        LOG.debug("Wrote last completed offset (" + lastCompletedOffset + ") to ZK for " + _partition + " for topology: " + _topologyInstanceId);
    } else {
        LOG.debug("No new offset for " + _partition + " for topology: " + _topologyInstanceId);
    }
}

ZkState

public void writeBytes(String path, byte[] bytes) {
    try {
        if (_curator.checkExists().forPath(path) == null) {
            _curator.create()
                    .creatingParentsIfNeeded()
                    .withMode(CreateMode.PERSISTENT)
                    .forPath(path, bytes);
        } else {
            _curator.setData().forPath(path, bytes);
        }
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

我可以看到,对于第一条消息,writeBytes方法进入if块并尝试创建路径,然后对于第二条消息,它进入else块,这似乎没问题.但是当我再次启动项目时,会出现上面提到的相同消息.没有partition information找到.

Answer 1

我有同样的问题.原来我在本地模式下运行,它使用内存zookeeper而不是Kafka正在使用的zookeeper.

为了确保为KafkaSpout不使用Storm的动物园管理员ZkState,存储的偏移量,你需要设置SpoutConfig.zkServers,SpoutConfig.zkPort以及SpoutConfig.zkRoot除ZkHosts.例如

import org.apache.zookeeper.client.ConnectStringParser;
import storm.kafka.SpoutConfig;
import storm.kafka.ZkHosts;
import storm.kafka.KeyValueSchemeAsMultiScheme;

...

    final ConnectStringParser connectStringParser = new ConnectStringParser(zkConnectStr);
    final List<InetSocketAddress> serverInetAddresses = connectStringParser.getServerAddresses();
    final List<String> serverAddresses = new ArrayList<>(serverInetAddresses.size());
    final Integer zkPort = serverInetAddresses.get(0).getPort();
    for (InetSocketAddress serverInetAddress : serverInetAddresses) {
        serverAddresses.add(serverInetAddress.getHostName());
    }

    final ZkHosts zkHosts = new ZkHosts(zkConnectStr);
    zkHosts.brokerZkPath = kafkaZnode + zkHosts.brokerZkPath;

    final SpoutConfig spoutConfig = new SpoutConfig(zkHosts, inputTopic, kafkaZnode, kafkaConsumerGroup);
    spoutConfig.scheme = new KeyValueSchemeAsMultiScheme(inputKafkaKeyValueScheme);

    spoutConfig.zkServers = serverAddresses;
    spoutConfig.zkPort = zkPort;
    spoutConfig.zkRoot = kafkaZnode;