从AWS Glue中的动态框架覆盖实木复合地板文件

问题描述

我使用动态框架在S3中写入镶木地板文件，但是如果文件已经存在，我的程序将附加一个新文件而不是替换它.我使用的句子是这样的:

I use dynamic frames to write a parquet file in S3 but if a file already exists my program append a new file instead of replace it. The sentence that I use is this:

glueContext.write_dynamic_frame.from_options(frame = table,
                                         connection_type = "s3",
                                         connection_options = {"path": output_dir,
                                                               "partitionKeys": ["var1","var2"]},
                                         format = "parquet")

是否有诸如"mode":"overwrite"之类的东西可以替换我的实木复合地板文件?

Is there anything like "mode":"overwrite" that replace my parquet files?

推荐答案

当前，AWS Glue不支持覆盖"模式，但他们正在使用此功能.

Currently AWS Glue doesn't support 'overwrite' mode but they are working on this feature.

作为一种解决方法，您可以将DynamicFrame对象转换为spark的DataFrame并使用spark而不是Glue编写它:

As a workaround you can convert DynamicFrame object to spark's DataFrame and write it using spark instead of Glue:

table.toDF()
  .write
  .mode("overwrite")
  .format("parquet")
  .partitionBy("var_1", "var_2")
  .save(output_dir)

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