Details
Major Description
If no online regionservers then master UI can't be opened. This issue occurs when using RSGroupAdminEndpoint coprocessor(RSGrouping). The master home page tries to load rsgroup info from "hbase:rsgroup" table but currently no regionservers up and running.
HTTP ERROR 500 Problem accessing /master-status. Reason: Server Error Caused by: java.io.UncheckedIOException: org.apache.hadoop.hbase.client.RetriesExhaustedException: Failed after attempts=2, exceptions: ... Tue Nov 05 23:58:51 UTC 2019, , org.apache.hadoop.hbase.exceptions.TimeoutIOException: Timeout(9450ms) waiting for region location for hbase:rsgroup, row='', replicaId=0 at org.apache.hadoop.hbase.client.ResultScanner$1.hasNext(ResultScanner.java:55) at org.apache.hadoop.hbase.RSGroupTableAccessor.getAllRSGroupInfo(RSGroupTableAccessor.java:59) at org.apache.hadoop.hbase.tmpl.master.RSGroupListTmplImpl.renderNoFlush(RSGroupListTmplImpl.java:58) at org.apache.hadoop.hbase.tmpl.master.RSGroupListTmpl.renderNoFlush(RSGroupListTmpl.java:150) at org.apache.hadoop.hbase.tmpl.master.MasterStatusTmplImpl.renderNoFlush(MasterStatusTmplImpl.java:346) at org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl.renderNoFlush(MasterStatusTmpl.java:397) at org.apache.hadoop.hbase.tmpl.master.MasterStatusTmpl.render(MasterStatusTmpl.java:388) at org.apache.hadoop.hbase.master.MasterStatusServlet.doGet(MasterStatusServlet.java:79)
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