hbase:regions in transition

In HBase, regions are a way of partitioning a table into smaller, more manageable parts. Regions in transition refers to the state of a region when it is being moved from one region server to another. This can happen due to reasons such as region server failures, load balancing, or cluster reconfiguration.

During the process of moving a region, it is marked as in transition, which means that it is not available for read or write operations until the move is completed. The region is assigned a state: OPENING, CLOSING, or FAILED_CLOSE, depending on the stage of the transition.

Once the region has been successfully moved to the new region server, it is marked as OPEN and becomes available for read and write operations. If there is a failure during the transition, the region is marked as FAILED_OPEN or FAILED_CLOSE, and further action may be required to resolve the issue.

Monitoring regions in transition is important to ensure the stability and availability of your HBase cluster. HBase provides tools such as the HBase shell and the HBase web interface to monitor the status of regions and identify any issues with regions in transition.