Beam：无法序列化和反序列化属性"awsCredentialsProvider"

Question

我一直在使用 Beam 管道示例作为指导，尝试从 S3 为我的管道加载文件。就像在示例中一样，我已经定义了自己的PipelineOptions，它也扩展了S3Options，并且我正在尝试使用DefaultAWSCredentialsProviderChain。配置此代码的代码是：

MyPipelineOptions options = PipelineOptionsFactory.fromArgs(args).as(MyPipelineOptions.class);
options.setAwsCredentialsProvider(new DefaultAWSCredentialsProviderChain());
options.setAwsRegion("us-east-1");
runPipeline(options);

当我从Intellij运行它时，它使用直接运行器工作正常但是当我将其打包为 jar 并执行它(也使用 Direct Runner(时，我看到：

Exception in thread "main" java.lang.IllegalArgumentException: PipelineOptions specified failed to serialize to JSON.
    at org.apache.beam.runners.direct.DirectRunner.run(DirectRunner.java:166)
    at org.apache.beam.runners.direct.DirectRunner.run(DirectRunner.java:67)
    at org.apache.beam.sdk.Pipeline.run(Pipeline.java:313)
    at org.apache.beam.sdk.Pipeline.run(Pipeline.java:299)
    at a.b.c.beam.CleanSkeleton.runPipeline(CleanSkeleton.java:69)
    at a.b.c.beam.CleanSkeleton.main(CleanSkeleton.java:53)
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Unexpected IOException (of type java.io.IOException): Failed to serialize and deserialize property 'awsCredentialsProvider' with value 'com.amazonaws.auth.DefaultAWSCredentialsProviderChain@40f33492'
    at com.fasterxml.jackson.databind.JsonMappingException.fromUnexpectedIOE(JsonMappingException.java:338)
    at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsBytes(ObjectMapper.java:3247)
    at org.apache.beam.runners.direct.DirectRunner.run(DirectRunner.java:163)
    ... 5 more

我正在使用 gradle 通过以下任务构建我的罐子：

jar {
    manifest {
        attributes (
                'Main-Class': 'a.b.c.beam.CleanSkeleton'
        )
    }
    from {
        configurations.runtimeClasspath.collect { it.isDirectory() ? it : zipTree(it) }
    }
    from('src') {
        include '/main/resources/*'
    }

    zip64 true
    exclude 'META-INF/*.RSA', 'META-INF/*.SF', 'META-INF/*.DSA'
}

Answer 1

出现问题是因为在创建 fat/uber jar 时，META-INF/serivces中的文件被重复文件覆盖。具体来说com.fasterxml.jackson.databind.Module需要定义许多杰克逊模块但缺少的地方。其中包括org.apache.beam.sdk.io.aws.options.AwsModule和com.fasterxml.jackson.datatype.joda.JodaModule。 DirectRunner中的代码实例化ObjectMapper如下所示：

new ObjectMapper()
      .registerModules(ObjectMapper.findModules(ReflectHelpers.findClassLoader()));

ObjectMapper::findModules依赖于从META-INF/services/文件中查找服务的java.util.ServiceLoader。

解决方案是使用 gradle Shadow 插件来构建 fat/uber jar 并将其配置为合并服务文件：

apply plugin: 'com.github.johnrengelman.shadow'

shadowJar {
    mergeServiceFiles()
    zip64 true
}