Hi Commnunity, When I do a testing, I met this issue on 0.94.3.
There are 1 active hmaster, 1 backup hmaster, 4 region servers. I run YCSB workload on it to load data. During the running of workload, I manually kill -9 the active hmaster, seems that backup master took over the active role quickly, but looping on " INFO org.apache.hadoop.hbase.master.ServerManager: Waiting for region servers count to settle; currently checked in 0, slept for 0 ms, expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval of 1500 ms. INFO org.apache.hadoop.hbase.master.ServerManager: Waiting for region servers count to settle; currently checked in 0, slept for xxx ms, expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval of 1500 ms. INFO org.apache.hadoop.hbase.master.ServerManager: Waiting for region servers count to settle; currently checked in 0, slept for xxx ms, expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval of 1500 ms. ... ... ... <for about 5 - 7 mins looping on this log message> ... INFO org.apache.hadoop.hbase.master.ServerManager: Waiting for region servers count to settle; currently checked in 1, slept for 0 ms, expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval of 1500 ms. INFO org.apache.hadoop.hbase.master.ServerManager: Waiting for region servers count to settle; currently checked in 2, slept for 0 ms, expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval of 1500 ms. INFO org.apache.hadoop.hbase.master.ServerManager: Waiting for region servers count to settle; currently checked in 3, slept for 0 ms, expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval of 1500 ms. INFO org.apache.hadoop.hbase.master.ServerManager: Waiting for region servers count to settle; currently checked in 4, slept for 0 ms, expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval of 1500 ms. " It seems there always a looping of 5 - 7 mins for the above waiting message for region servers to checked in to the new active master. Then after a long wait loop, it suddenly checked in 4 region servers successfully. Any idea of this waiting loop? Thanks a lot for the advice~ -- Best Regards, Julian
