thanks, that put me in the right direction for completeness, just setting SPARK_HOME was not sufficient, it was missing py4j setting PYTHONPATH fixed that issue export SPARK_HOME=/opt/cloudera/parcels/SPARK2-2.3.0.cloudera3-1.cdh5.13.3.p0.458809/lib/spark2 export PYTHONPATH=$SPARK_HOME/python:$SPARK_HOME/python/lib/py4j-0.10.7-src.zip:$PYTHONPATH   Now pyspark shows: version 2.3.0.cloudera3 ... View more

Hey,   Optimizing your Kafka Cluster depends upon your cluster usage & use-case.   Based on your main concern like throughput or CPU utilization or Memory/Disk usage, you need to modify different parameters and some changes may have an impact on other aspects. For example, if acknowledgments is set to "all", all brokers that replicate the partitions need to acknowledge that the data was written prior to confirming the next message needs to be sent. This will ensure data consistency but increase CPU utilization and network latency.   Refer Benchmarking Apache Kafka: 2 Million Writes Per Second (On Three Cheap Machines) article[1] written by Jay Kreps(Co-founder and CEO at Confluent).   [1]https://engineering.linkedin.com/kafka/benchmarking-apache-kafka-2-million-writes-second-three-cheap-machines   Please let me know if this helps.   Regards, Ankit. ... View more

Hello thanks for your responce, Actually the issue is resolved and its JournalNodeEdits directory permission issue. So i have modified it and restarted Jornalnodes and started successfully. NN's are also came back and able to see all other dependent services.   Thanks again 🙂   ... View more