Question

我需要使用信任商店在Google Cloud Dataflow中建立SSL Kafka连接。我可以从存储桶中提供此信息，还是可以将其存储在“本地文件系统”中？

Answer 1

您可以使用KafkaIO.Read.withConsumerFactoryFn提供将被调用以创建Kafka使用者的工厂函数。在该功能中，您可以自由地做任何您喜欢的事情，例如：您可以从GCS存储桶下载信任存储文件（我建议使用GcsUtil）并将其保存到本地磁盘上的临时文件中 - AFAIK Kafka本身仅支持在本地磁盘上存储此文件。然后手动创建KafkaConsumer并将其指向文件。

Answer 2

感谢@jkff提供解决方案，这是一个实现示例：

样本ConsumerFactoryFn实现：

    private static class ConsumerFactoryFn
        implements SerializableFunction<Map<String, Object>, Consumer<byte[], byte[]>> 
{



    public Consumer<byte[], byte[]> apply(Map<String, Object> config) 
    {
        try 
        {
            Storage storage = StorageOptions.newBuilder()
                    .setProjectId("prj-id-of-your-bucket")
                    .setCredentials(GoogleCredentials.getApplicationDefault())
                    .build()
                    .getService();
            Blob blob = storage.get("your-bucket-name", "pth.to.your.kafka.client.truststore.jks");
            ReadChannel readChannel = blob.reader();
            FileOutputStream fileOuputStream;
            fileOuputStream = new FileOutputStream("/tmp/kafka.client.truststore.jks"); //path where the jks file will be stored
            fileOuputStream.getChannel().transferFrom(readChannel, 0, Long.MAX_VALUE);
            fileOuputStream.close();
            File f = new File("/tmp/kafka.client.truststore.jks"); //assuring the store file exists
            if (f.exists())
            {
                LOG.debug("key exists");

            }
            else
            {
                LOG.error("key does not exist");

            }

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            LOG.error( e.getMessage());
        } catch (IOException e) {
            // TODO Auto-generated catch block
            LOG.error( e.getMessage());
        }


        config.put("ssl.truststore.location",(Object) "/tmp/kafka.client.truststore.jks" );

        return new KafkaConsumer<byte[], byte[]>(config);
    }
}

并且不要忘记在您的KafkaIO.read（）调用中使用.withConsumerFactoryFn，应该类似于：

Map<String, Object> configMap = new HashMap<String, Object>();
configMap.put("security.protocol", (Object) "SSL");
configMap.put("ssl.truststore.password", (Object) "clientpass");

p.apply("ReadFromKafka", KafkaIO.<String, String>read()
            .withBootstrapServers("ip:9093")
            .withTopic("pageviews")
            .withKeyDeserializer(StringDeserializer.class)
            .withValueDeserializer(StringDeserializer.class)
            .updateConsumerProperties(configMap)
            .withConsumerFactoryFn(new ConsumerFactoryFn()) ... etc.

Truststore和Google Cloud Dataflow

2 个答案: