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https://issues.apache.org/jira/browse/SPARK-32079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17447747#comment-17447747
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Hyukjin Kwon commented on SPARK-32079:
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im working on this.
> PySpark <> Beam pickling issues for collections.namedtuple
> ----------------------------------------------------------
>
> Key: SPARK-32079
> URL: https://issues.apache.org/jira/browse/SPARK-32079
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Affects Versions: 3.0.0
> Reporter: Gerard Casas Saez
> Priority: Major
>
> PySpark monkeypatching namedtuple makes it difficult/impossible to depickle
> collections.namedtuple instances from outside of a pyspark environment.
>
> When PySpark has been loaded into the environment, any time that you try to
> pickle a namedtuple, you are only able to unpickle it from an environment
> where the
> [hijack|https://github.com/apache/spark/blob/master/python/pyspark/serializers.py#L385]
> has been applied.
> This conflicts directly when trying to use Beam from a non-Spark environment
> (namingly Flink or Dataflow) making it impossible to use the pipeline if it
> has a namedtuple loaded somewhere.
>
> {code:python}
> import collections
> import dill
> ColumnInfo = collections.namedtuple(
> "ColumnInfo",
> [
> "name", # type: ColumnName # pytype: disable=ignored-type-comment
> "type", # type: Optional[ColumnType] # pytype:
> disable=ignored-type-comment
> ])
> dill.dumps(ColumnInfo('test', int))
> {code}
> {{b'\x80\x03cdill._dill\n_create_namedtuple\nq\x00X\n\x00\x00\x00ColumnInfoq\x01X\x04\x00\x00\x00nameq\x02X\x04\x00\x00\x00typeq\x03\x86q\x04X\x08\x00\x00\x00__main__q\x05\x87q\x06Rq\x07X\x04\x00\x00\x00testq\x08cdill._dill\n_load_type\nq\tX\x03\x00\x00\x00intq\n\x85q\x0bRq\x0c\x86q\r\x81q\x0e.'}}
> {code:python}
> import pyspark
> import collections
> import dill
> ColumnInfo = collections.namedtuple(
> "ColumnInfo",
> [
> "name", # type: ColumnName # pytype: disable=ignored-type-comment
> "type", # type: Optional[ColumnType] # pytype:
> disable=ignored-type-comment
> ])
> dill.dumps(ColumnInfo('test', int))
> {code}
> {{b'\x80\x03cpyspark.serializers\n_restore\nq\x00X\n\x00\x00\x00ColumnInfoq\x01X\x04\x00\x00\x00nameq\x02X\x04\x00\x00\x00typeq\x03\x86q\x04X\x04\x00\x00\x00testq\x05cdill._dill\n_load_type\nq\x06X\x03\x00\x00\x00intq\x07\x85q\x08Rq\t\x86q\n\x87q\x0bRq\x0c.'}}
> Second pickled object can only be used from an environment with PySpark.
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