Hi, My cluster has around 50k regions and 130 RS. In case of unclean shutdown, the cluster take around 40 50 mins to come up(mostly slow on region assignment from observation). Trying to optimize it found following possible configs:
*hbase.assignment.usezk:* which will co-host meta table and Hmaster and avoid zk interaction for region assignment. *hbase.master.distributed.log.replay:* to replay the edit logs in distributed manner. Testing *hbase.assignment.usezk* alone on small cluster(2200 regions, 4 RS) gave following results: hbase.assignment.usezk=true -> 12 mins hbase.assignment.usezk=false -> 9 mins >From this blog <https://blogs.apache.org/hbase/entry/hbase_zk_less_region_assignment>, i was expecting better results so probably I am missing something. Will appreciate any pointers. Thanks, Sahil
