Over a million developers have joined DZone.
Platinum Partner

Hbase Error: Region is not online: -ROOT-„0

· Big Data Zone

The Big Data Zone is presented by Exaptive.  Learn about how to rapidly iterate data applications, while reusing existing code and leveraging open source technologies.

If you are running HBase and commands are giving you an error that looks like this:

Fri Oct 05 21:45:02 UTC 2012, org.apache.hadoop.hbase.client.ScannerCallable@74f2db2d, org.apache.hadoop.hbase.NotServingRegionException: org.apache.hadoop.hbase.NotServingRegionException: Region is not online: -ROOT-„0

at org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2859)

at org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:2071)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:364)

at org.apache.hadoop.hbase.ipc.

HBaseServer$Handler.run(HBaseServer.java:1345)

Your HBase master is failing to start because Zookeeper is giving it an incorrect location for where the -ROOT- table is located. If you go into the HBase webui, you’ll see “Assigning ROOT region” as the status of the master node on startup.

To fix this:

$ hbase zkcli

zookeeper_cli> rmr /hbase/root-region-server

Then restart your master node, and you should be fine.

The Big Data Zone is presented by Exaptive.  Learn how rapid data application development can address the data science shortage.

Topics:

Published at DZone with permission of George London , DZone MVB .

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}