Hi Kartik, Have you tried following these steps: http://www.cloudera.com/documentation/enterprise/5-4-x/topics/admin_nn_migrate_roles.html?scroll=concept_w3h_m2l_2r_unique_1   Otherwise, if you can bring down HDFS, you can do the following: 1. Stop HDFS service 2. Copy over JN edits from a (good) JN to the (bad) JN. Make sure you get all edits from all dirs ( dfs.journalnode.edits.dir) 3. Start HDFS service   Let me know if that works for you.   ... View more

Bommuraj, you can set it in CM under HDFS service. It's a service wide setting. So under Services click on HDFS service, then click on Configuration -> View/Edit. Then click on the drop-down for Service-Wide and it's under the Performance section.   -Hazem ... View more