Problem was solved by:

Cloudera Manager -> HDFS -> Configuration

Than in the  "Cluster-wide Advanced Configuration Snippet (Safety Valve) for core-site.xml"

add:

<property>
<name>hadoop.proxyuser.sdc.hosts</name>
<value>*</value>
</property>
<property>
<name>hadoop.proxyuser.sdc.groups</name>
<value>*</value>
</property>

 Then restart the cluster