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如何使用Cloud Dataflow中的TextIO.Read将多个文件与名称匹配

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I have a gcs folder as below:

我有一个gcs文件夹,如下所示:

gs://<bucket-name>/<folder-name>/dt=2017-12-01/part-0000.tsv
                                /dt=2017-12-02/part-0000.tsv
                                /dt=2017-12-03/part-0000.tsv
                                /dt=2017-12-04/part-0000.tsv
                                ...

I want to match only the files under dt=2017-12-02 and dt=2017-12-03 using sc.textFile() in Scio, which uses TextIO.Read.from() underneath as far as I know.

我想在scio中使用sc.textFile()匹配dt = 2017-12-02和dt = 2017-12-03下的文件,据我所知,它使用下面的TextIO.Read.from()。

I've tried

我试过了

gs://<bucket-name>/<folder-name>/dt={2017-12-02,2017-12-03}/*.tsv

and

gs://<bucket-name>/<folder-name>/dt=2017-12-(02|03)/*.tsv

Both match zero files:

两者都匹配零文件:

INFO org.apache.beam.sdk.io.FileBasedSource - Filepattern gs://<bucket-name>/<folder-name>/dt={2017-12-02,2017-12-03}/*.tsv matched 0 files with total size 0

INFO org.apache.beam.sdk.io.FileBasedSource - Filepattern gs://<bucket-name>/<folder-name>/dt=2017-12-(02|03)/*.tsv matched 0 files with total size 0

What should be the valid filepattern on doing this?

这样做的有效文件模式应该是什么?

2 个解决方案

#1


1  

You need to use the TextIO.readAll() transform that reads a PCollection<String> of filepatterns. Create the collection of filepatterns either explicitly via Create.of() or you can compute it using a ParDo.

您需要使用TextIO.readAll()转换来读取filepatterns的PCollection 。通过Create.of()显式创建文件模式的集合,或者您可以使用ParDo计算它。

case class ReadPaths(paths: java.lang.Iterable[String]) extends PTransform[PBegin, PCollection[String]] {
  override def expand(input: PBegin) = {
    Create.of(paths).expand(input).apply(TextIO.readAll())
  }
}

val paths = Seq(
  "gs://<bucket-name>/<folder-name>/dt=2017-07-01/part-0000.tsv",
  "gs://<bucket-name>/<folder-name>/dt=2017-12-20/part-0000.tsv",
  "gs://<bucket-name>/<folder-name>/dt=2018-03-29/part-0000.tsv",
  "gs://<bucket-name>/<folder-name>/dt=2018-05-04/part-0000.tsv"
)

import scala.collection.JavaConverters._

sc.customInput("Read Paths", ReadPaths(paths.asJava))

#2


1  

This might work:

这可能有效:

gs://bucket/folder/dt=2017-12-0[12]/*.tsv

Reference: https://cloud.google.com/storage/docs/gsutil/addlhelp/WildcardNames

参考:https://cloud.google.com/storage/docs/gsutil/addlhelp/WildcardNames


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