Self resolved The switch between direct single threaded copy and distcp depends on file size gt  hive.exec.copyfile.maxsize The default value is 32MB     ... View more

The lock held above has 6-8 sec lock this will not cause the slowness also above is from service rpc while block is reporting to NN, Check any lock held more than 10-15 sec, Heap utilisation and Heap required is completely different for keeping 300M block you should required 300GB although the heap utilisation is for current utilising jobs please review below doc: https://docs.cloudera.com/cdp-private-cloud-upgrade/latest/upgrade/topics/cdpdc-hdfs.html ... View more