https://community.cloudera.com/t5/Support-Questions/Hbase-regions-in-Transition-count-not-decreasing/m-p/305042#M222286 <P>Hello&nbsp;<a href="https://community.cloudera.com/t5/user/viewprofilepage/user-id/68583">@Manoj690</a>&nbsp;</P><P>&nbsp;</P><P>The best way would be to check the RegionServer Logs wherein the Region are stuck in OPENING State. The fact that Count of Region-In-Transition is reducing with time &amp; Increasing again upon HBase Service Restart indicates the Regions are likely waiting on WAL Split &amp; Edit Replay. With 3 RegionServer, 7K RIT indicates you must be having more than 7K Regions in Total. As such, the RegionServer are overloaded &amp; WAL Split &amp; Edit Replay would be Slow.&nbsp;</P><P>&nbsp;</P><P>There are RegionOpening Thread, which can be Increased yet the Ideal Solution would be to Reduce the RegionCount or Increase RegionServer Count to ~300-400 Region/RegionServer.&nbsp;</P><P>&nbsp;</P><P>- Smarak</P> Thu, 29 Oct 2020 05:14:34 GMT smdas 2020-10-29T05:14:34Z