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From Murtadha Hubail <>
Subject Storage Structure Change
Date Mon, 27 Nov 2017 23:07:33 GMT
Hi all,


Recently, a feature was added to AsterixDB to allow a dataset to be rebalanced from a set
of nodes (a node group) to another node group. Rebalancing a dataset will result in redistributing
the dataset’s data to the nodes in the new node group. Since a single node may appear in
both the old and the new node group, a new level in the storage tree had to be introduced
to distinguish between the old and the new copies of the dataset. To do that without breaking
backward compatibility for existing users who would like to upgrade binaries without having
to reload their existing data, we added a migration utility that will run on the node startup
and migrate the data to the new storage structure. However, it is recommended that you backup
your existing data to avoid any permanent data loss in case of any unexpected failures during
the migration process.




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