Hi Nagaraj/ Anyone Can you please share the steps if you remember ?  ERROR org.apache.hadoop.hdfs.server.namenode.ha.StandbyCheckpointer: Exception in doCheckpoint java.io.IOException: Exception during image upload: java.lang.NoClassDefFoundError: org/apache/http/client/utils/URIBuilder Caused by: java.lang.NoClassDefFoundError: org/apache/http/client/utils/URIBuilder ... View more

HDFS Balancer (2): Configurations & CLI Options:  https://community.cloudera.com/t5/Community-Articles/HDFS-Balancer-2-Configurations-CLI-Options/ta-p/246687 ... View more

To add,   For sizing a datanode heap it's similar to namenode heap, its recommend 1GB per 1M blocks. As a block could be as small a 1byte or as large as 128MB, the requirement of heap space is the same. ... View more