Shulou(Shulou.com)06/01 Report--

When learning hbase, set up the environment and start the hbase,jps viewing process to find that hmaster and hregionserevr can appear normally.

After entering hbase shell under the terminal, you can also enter the shell of hbase, and then report an error after entering List

Error message: ERROR: org.apache.hadoop.hbase.PleaseHoldException: Master is initializing

Check the error log and find: as shown in the figure

Found that there is a node can not connect, so master has been waiting state, can not list the specific namespace. This node that starts another cluster returns to normal.

Of course, it is necessary to ensure that zookeeper can provide services normally. You can check the status of the zookeeper to see if it is normal; the zkServer.sh status; must ensure that more than half of the processes survive.

Then, to ensure time synchronization, you can temporarily manually synchronize or set up a NTP server.

Screenshot of normal hbase cluster

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