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From "Edwin Biemond (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (SPARK-27927) driver pod hangs with pyspark 2.4.3 and master on kubenetes
Date Sat, 13 Jul 2019 10:25:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-27927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16884339#comment-16884339
] 

Edwin Biemond edited comment on SPARK-27927 at 7/13/19 10:24 AM:
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thanks again,  indeed it looks like this commit can an issue [https://github.com/apache/spark/commit/03e90f65bfdad376400a4ae4df31a82c05ed4d4b#diff-2952082eba54dc17cd6f73a3260e8f2d]

it is related to dag-scheduler-event-loop blocked thread and hitting my sparkcontext, spark
session issue.

but this was already commit 1 year ago and spark 2.4.0 is working fine for us. Which already
had this change.

The hunt goes on

 


was (Author: ebiemond):
thanks again,  indeed it looks like this commit can be the issue [https://github.com/apache/spark/commit/03e90f65bfdad376400a4ae4df31a82c05ed4d4b#diff-2952082eba54dc17cd6f73a3260e8f2d]

it is related to dag-scheduler-event-loop blocked thread and hitting my sparkcontext, spark
session issue.

 

> driver pod hangs with pyspark 2.4.3 and master on kubenetes
> -----------------------------------------------------------
>
>                 Key: SPARK-27927
>                 URL: https://issues.apache.org/jira/browse/SPARK-27927
>             Project: Spark
>          Issue Type: Bug
>          Components: Kubernetes, PySpark
>    Affects Versions: 3.0.0, 2.4.3
>         Environment: k8s 1.11.9
> spark 2.4.3 and master branch.
>            Reporter: Edwin Biemond
>            Priority: Major
>         Attachments: driver_threads.log, executor_threads.log
>
>
> When we run a simple pyspark on spark 2.4.3 or 3.0.0 the driver pods hangs and never
calls the shutdown hook. 
> {code:java}
> #!/usr/bin/env python
> from __future__ import print_function
> import os
> import os.path
> import sys
> # Are we really in Spark?
> from pyspark.sql import SparkSession
> spark = SparkSession.builder.appName('hello_world').getOrCreate()
> print('Our Spark version is {}'.format(spark.version))
> print('Spark context information: {} parallelism={} python version={}'.format(
> str(spark.sparkContext),
> spark.sparkContext.defaultParallelism,
> spark.sparkContext.pythonVer
> ))
> {code}
> When we run this on kubernetes the driver and executer are just hanging. We see the output
of this python script. 
> {noformat}
> bash-4.2# cat stdout.log
> Our Spark version is 2.4.3
> Spark context information: <SparkContext master=k8s://https://kubernetes.default.svc:443
appName=hello_world> parallelism=2 python version=3.6{noformat}
> What works
>  * a simple python with a print works fine on 2.4.3 and 3.0.0
>  * same setup on 2.4.0
>  * 2.4.3 spark-submit with the above pyspark
>  
>  
>  



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