Hello @Menyawy    Thanks for using Cloudera Community. The Error [1] indicates your Team is using CDH v5.x using HBase v1.x. In the concerned release, We have limited choices to ensure "hbase:namespace" Table Region is assigned correctly as shared below:   (I) Easier Yet Not-Always-Successful Option: 1) Shutdown HBase Service 2) echo "rmr /hbase" | hbase zkcli (From HMaster Node) 3) Start HBase Service 4) sudo hbase hbase hbck -fixAssignments (II) Review whether any of the "hbase:namespace" Table Region files are reporting MissingBlockException. If Yes, We need to fix the MissingBlockException. (III) Possible for the RegionServer Logs (Wherein the "hbase:namespace" Table Region is being assigned) would offer additional insight into the reasoning for the RegionServer being Unable to assign the "hbase:namespace" Table Region successfully. Your Team may review the concerned RegionServer Logs as well.   There may be Other Options, yet such Inconsistencies are better handled in HBase 2.x [1] & your Team should plan for using HBase v2.x soon.   Regards, Smarak   [1] https://github.com/apache/hbase-operator-tools/blob/master/hbase-hbck2/README.md#master-startup-cannot-progress-in-holding-pattern-until-region-onlined ... View more