这是由于S3 Sink最近发现的一个已知问题，可以通过升级AWS SDK版本解决。提供一个基本的Flink代码示例，使Streaming文件汇集到S3。

StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

// set S3 Credentials Provider
env.getCheckpointConfig().setCheckpointStorage(new S3FsCheckpointStorage());
env.getCheckpointConfig().setCheckpointingMode(CheckpointingMode.EXACTLY_ONCE);
env.enableCheckpointing(10*60_000); //10 minutes

// write operation
DataStream stream = ...
stream.addSink(buildS3StringSink("s3a://myBucket/output/prefix"));

// build StringS3 sink
private static StreamingFileSink buildS3StringSink(String outputPrefix) {
    String S3_A_REGION = "eu-west-1";

    final String[] AWS_CREDENTIALS = {
            "aws.accessKeyId",
            "aws.secretAccessKey"
    };
    Properties awsCredentials = new Properties();
    for (String propName : AWS_CREDENTIALS)
        if (System.getProperty(propName) != null)
            awsCredentials.setProperty(propName, System.getProperty(propName));

    final StreamingFileSink sink = StreamingFileSink
            .forBulkFormat(new Path(outputPrefix), ParquetAvroWriters
                            .buildAvroParquetWriter(SCHEMA).withCompressionCodec(CompressionCodecName.SNAPPY))
            .withBucketAssigner(new DateTimeBucketAssigner<>("yyyy/MM/dd/HH", ZoneId
                    .of("Europe/Warsaw")))
            .withBucketCheckInterval(DEFAULT_BUCKET_CHECK_INTERVAL)
            .withPartSuffix(".parquet")
            .withS3Config(new S3Config(S3_A_REGION, awsCredentials));
    return sink;
}

请注意，这是一个可能的解决方案，具体取决于您的应用程序配置，环境和代码。此外，请确保您的AWS SDK版本符合Flink版本要求。