@npandey   Thanks for your response!     1. The math value for name node handler count according to Cloudera doc    dfs.namenode.service.handler.count and dfs.namenode.handler.count - For each NameNode, set to ln(number of DataNodes in this HDFS service) * 20.    https://docs.cloudera.com/documentation/enterprise/5-15-x/topics/cm_mc_autoconfig.html#concept_v4y_vb3_rn__section_bgr_d3w_d4   As per you said for example 12 data nodes it should  be   ln(12)*20 = 50   But you say to follow this 20*log2(12) formula? can you cross-check and let me know on this.   2. I have the dump but can you walk me how to check how many handlers running?     ... View more