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https://issues.apache.org/jira/browse/SPARK-26019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16716759#comment-16716759
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ASF GitHub Bot commented on SPARK-26019:
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HyukjinKwon commented on issue #23113: [SPARK-26019][PYTHON] Fix race condition
in accumulators.py: _start_update_server()
URL: https://github.com/apache/spark/pull/23113#issuecomment-446144908
So, are we going to update this PR for issuing warning or create another PR?
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> pyspark/accumulators.py: "TypeError: object of type 'NoneType' has no len()"
> in authenticate_and_accum_updates()
> ----------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-26019
> URL: https://issues.apache.org/jira/browse/SPARK-26019
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Affects Versions: 2.3.2, 2.4.0
> Reporter: Ruslan Dautkhanov
> Priority: Major
>
> Started happening after 2.3.1 -> 2.3.2 upgrade.
>
> {code:python}
> Exception happened during processing of request from ('127.0.0.1', 43418)
> ----------------------------------------
> Traceback (most recent call last):
> File "/opt/cloudera/parcels/Anaconda/lib/python2.7/SocketServer.py", line
> 290, in _handle_request_noblock
> self.process_request(request, client_address)
> File "/opt/cloudera/parcels/Anaconda/lib/python2.7/SocketServer.py", line
> 318, in process_request
> self.finish_request(request, client_address)
> File "/opt/cloudera/parcels/Anaconda/lib/python2.7/SocketServer.py", line
> 331, in finish_request
> self.RequestHandlerClass(request, client_address, self)
> File "/opt/cloudera/parcels/Anaconda/lib/python2.7/SocketServer.py", line
> 652, in __init__
> self.handle()
> File
> "/opt/cloudera/parcels/SPARK2-2.3.0.cloudera4-1.cdh5.13.3.p0.611179/lib/spark2/python/lib/pyspark.zip/pyspark/accumulators.py",
> line 263, in handle
> poll(authenticate_and_accum_updates)
> File
> "/opt/cloudera/parcels/SPARK2-2.3.0.cloudera4-1.cdh5.13.3.p0.611179/lib/spark2/python/lib/pyspark.zip/pyspark/accumulators.py",
> line 238, in poll
> if func():
> File
> "/opt/cloudera/parcels/SPARK2-2.3.0.cloudera4-1.cdh5.13.3.p0.611179/lib/spark2/python/lib/pyspark.zip/pyspark/accumulators.py",
> line 251, in authenticate_and_accum_updates
> received_token = self.rfile.read(len(auth_token))
> TypeError: object of type 'NoneType' has no len()
>
> {code}
>
> Error happens here:
> https://github.com/apache/spark/blob/cb90617f894fd51a092710271823ec7d1cd3a668/python/pyspark/accumulators.py#L254
> The PySpark code was just running a simple pipeline of
> binary_rdd = sc.binaryRecords(full_file_path, record_length).map(lambda .. )
> and then converting it to a dataframe and running a count on it.
> It seems error is flaky - on next rerun it didn't happen.
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