Here is an excellent article written by Chris Nauroth on how to tune GC. https://community.hortonworks.com/articles/14170/namenode-garbage-collection-configuration-best-pra.html
Here is another guide that explains the relative file objects size and GC settings. https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.4.2/bk_installing_manually_book/content/ref-80953924-1cbf-4655-9953-1e744290a6c3.1.html Since you mentioned pause as an issue, this might help you. https://docs.hortonworks.com/HDPDocuments/Ambari-2.2.2.0/bk_Ambari_Users_Guide/content/_tuning_garbage_collection.html --Anu From: sandeep vura <[email protected]> Date: Tuesday, September 13, 2016 at 6:11 AM To: "[email protected]" <[email protected]> Subject: Pause duration alert on Name Node Hi Hadoop experts, We are getting continuous Pause duration alert from Standby NN. Current configuration for Java heap size of NN : 7.8 GB When we checked NN webUI heap memory used 7.5 GB of 7.8 GB heap memory. Please suggest how to fix this. Thanks sandeep
