Hello everyone,
I am Li Yuheng, a contributor to the IoTDB community. I am proud to share with
you an exciting feature in IoTDB: Region Migration.
As a distributed database, IoTDB uses regions as the base unit for distributed
data storage. The distribution of regions across the cluster determines the
allocation of write load and disk usage among DataNodes. With the region
migration feature, IoTDB users can flexibly allocate storage resources within
the cluster:
After adding a new DataNode, migrate regions to the new node to balance write
load and disk space.
Before removing an old DataNode, migrate all regions on it to other DataNodes.
The frame for region migration was initially implemented in 2022. This year,
after significant contributions from multiple community members (including Deng
Chao, Hu Xiangpeng, Liu Zhen, Tan Xinyu, and I), we have brought this feature
to a practical and usable state.
Now, region migration has the following characteristics:
Solid stability and performance.
The cluster can continue to handle reads and writes during region migration.
Any issues that interrupt the migration process can be addressed and resolved
without permanent impact.
As of the recently released IoTDB 1.3.3, the region migration feature is
generally available. We are continuing to iterate and optimize it, and even
better performance will be provided in versions 2.0 and 1.3.4. If you have any
feedback, please feel free to share with us.
We look forward to you exploring and enjoying this feature!
Best regards,
Li Yuheng
