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"RuntimeException: core-site.xml not found" while calling subprocess.call([])

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After upgrading (fresh installation) to the Cloudera CDH 6.1 all our ETLs (pyspark scripts) are being failed. Withing the scripts we use subprocess.call([]) to work with HDFS directories which was working on CDH 5.13 but fails to execute on current release. It throws the following error: RuntimeException: core-site.xml not found

 

See the details below

 

$ sudo -u spark pyspark --master yarn --deploy-mode client 
Python 2.7.5 (default, Oct 30 2018, 23:45:53) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
Setting default log level to "WARN".
To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel).
19/03/11 20:24:42 WARN lineage.LineageWriter: Lineage directory /var/log/spark/lineage doesn't exist or is not writable. Lineage for this application will be disabled.
19/03/11 20:24:43 WARN lineage.LineageWriter: Lineage directory /var/log/spark/lineage doesn't exist or is not writable. Lineage for this application will be disabled.
Welcome to
____ __
/ __/__ ___ _____/ /__
_\ \/ _ \/ _ `/ __/ '_/
/__ / .__/\_,_/_/ /_/\_\ version 2.4.0-cdh6.1.0
/_/

Using Python version 2.7.5 (default, Oct 30 2018 23:45:53)
SparkSession available as 'spark'.
>>> import subprocess
>>> subprocess.call(["hadoop", "fs", "-ls"])
WARNING: log4j.properties is not found. HADOOP_CONF_DIR may be incomplete.
Exception in thread "main" java.lang.RuntimeException: core-site.xml not found
at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2891)
at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:2839)
at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:2716)
at org.apache.hadoop.conf.Configuration.set(Configuration.java:1353)
at org.apache.hadoop.conf.Configuration.set(Configuration.java:1325)
at org.apache.hadoop.conf.Configuration.setBoolean(Configuration.java:1666)
at org.apache.hadoop.util.GenericOptionsParser.processGeneralOptions(GenericOptionsParser.java:339)
at org.apache.hadoop.util.GenericOptionsParser.parseGeneralOptions(GenericOptionsParser.java:569)
at org.apache.hadoop.util.GenericOptionsParser.<init>(GenericOptionsParser.java:174)
at org.apache.hadoop.util.GenericOptionsParser.<init>(GenericOptionsParser.java:156)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90)
at org.apache.hadoop.fs.FsShell.main(FsShell.java:389)

 

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