Resolve “org.apache.hadoop.hbase.NotServingRegionException” in Apache Hbase

ByJerry Richard

Symptom:

The application fails while accessing the regions that are offline

 org.apache.hadoop.hbase.NotServingRegionException: org.apache.hadoop.hbase.NotServingRegionException: test:test,4:sample.703243:201310,1632342333102.3067sdfs84js51dd3e374aa1bfa2bea. is not online on <hostname>,16020,1632342333102

Cause:

The HBase region is hosted in HBase meta but it’s not assigned to any region servers. If an application tries to read data from an unassigned region then the application will receive the above error.

ERROR

The table is still accessible but error only thrown for accessing un-assigned region, 1c7eaaf4060b3200f08e940145469ad1.

org.apache.hadoop.hbase.NotServingRegionException: test:test,4:sample.703243:201310,1632342333102.3067sdfs84js51dd3e374aa1bfa2bea. is not online on <hostname>,16020,1632342333102

Resolution:

Check the region state from the HBase meta, which can be collected by the below command

echo "scan 'hbase:meta'" | hbase shell |  egrep "info:regioninfo|info:state" | grep <namespace:table> | grep <region>

Regions states would be either CLOSED or OFFLINE

From Regions logs:

sample.703243:201310,1632342333102.3067sdfs84js51dd3e374aa1bfa2bea. column=info:state, timestamp=1620003455215, value=CLOSED

— Use Hbck jar to assign manually

# hbase hbck -j hbase-hbck2-<version>.jar assigns <region>

Example:

hbase hbck -j hbase-hbck2-<version>.jar assigns 3067sdfs84js51dd3e374aa1bfa2bea

Good Luck with your Learning, Like the post if it is helpful

Jerry Richard

Jerry grew up in a small town where he enjoyed playing video games. Once out of the nest, he pursued a Bachelor's degree in Computer Engineering. After college, he ultimately landed in the IT industry. Currently, he has over 10 years of experience. In his spare time, Jerry enjoys spending time with his family.

He is creator of this website - learnerkb.com, A website dedicated to share the mistake and experience learned.

Check my bio for more information About Me

Similar Posts