Check the heap assigned for the node manager   in the hadoop/etc/hadoop/yarn-env.sh define the heap for node manager   JAVA=$JAVA_HOME/bin/java JAVA_HEAP_MAX=-Xmx256m # For setting YARN specific HEAP sizes please use this # Parameter and set appropriately YARN_HEAPSIZE=256 After that, you can configure the resources in yarn-site.xml <configuration> <property> <name>yarn.nodemanager.aux-services</name> <value>mapreduce_shuffle</value> </property> <property> <name>yarn.scheduler.minimum-allocation-mb</name> <value>2000</value> </property> <property> <name>yarn.scheduler.minimum-allocation-vcores</name> <value>1</value> </property> <property> <name>yarn.nodemanager.resource.memory-mb</name> <value>2000</value> </property> <property> <name>yarn.nodemanager.resource.cpu-vcores</name> <value>1</value> </property> </configuration>   please like and confirm if it helps   Thanks Ashish ... View more

Hi,   I have encountered the same issue and it got resolved by the following steps   Please check the port of Nifi in Ambari UI for SSL and without SSL. Update similar port within NIFI Settings > Controler settings > REGISTRY CLIENTS with the hostname of the nifi registry. Then add the proxy user as mentioned in the following link.   http://apache-nifi-users-list.2361937.n4.nabble.com/No-available-buckets-on-Nifi-td9971.html   Thanks Ashish       ... View more

Could you please let us know which documentation you are talking about? ... View more