默认情况下,aws glue处理新数据吗?

从这个例子中我可以看到,他们从S3中的一个爬网位置读取数据,然后每次都替换一个文件,完全重新加载所有数据。

要仅处理新文件,您需要 Bookmarks 为您的工作启用,并确保您通过执行以下操作来提交工作:

args = getResolvedOptions(sys.argv, [‘TempDir’,’JOB_NAME’])
glue_context = GlueContext(SparkContext.getOrCreate()

# Instantiate your job object to later commit
job = Job(glue_context)
job.init(args[‘JOB_NAME’], args)

# Read file, if you enable Bookmark and commit at the end, this will only
# give you new files
dynamic_frame = glueContext.create_dynamic_frame.from_catalog(database = db_name, table_name = tbl_name)

result_dynamic_frame = # do some operations

# Append operation to create new parquet files from new data
result_dynamic_frame.toDF().write
  .mode("append")
  .parquet("s3://bucket/prefix/permit-inspections.parquet")

# Commit my job so next time we read, only new files will come in
job.commit()

希望这有帮助