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SingleStoreDB v8.0

SHOW REBALANCE STATUS

Shows the status of the currently executing REBALANCE PARTITIONS, RESTORE REDUNDANCY, RESTORE, ATTACH LEAF, auto-failover or auto-attach operation on a database.

Syntax

SHOW REBALANCE STATUS ON db_name

Remarks

  • db_name - name of a SingleStoreDB database.

  • This command must be run on the master aggregator node (see Node Requirements for SingleStoreDB Commands ).

  • Alternatively, you can query the information schema view MV_REBALANCE_STATUS . The following query returns the same output as the SHOW REBALANCE STATUS ON db_name command:

    SELECT * FROM information_schema.MV_REBALANCE_STATUS
WHERE database_name = 'db_name';

  • See the Permission Matrix for the required permission.

The Ordinal is the target partition’s ordinal, and the Target_Host and Target_Port correspond to the destination leaf. Any two operations in the same Phase can be run in parallel and phases are run in order. For example, the aggregator can run COPY PARTITION on partitions test:1 and test:3 in parallel. The exact meaning of what each phase means is arbitrary and depends on the particular rebalance operation. The Estimated_Time_Remaining_Ms is the estimated total time (in milliseconds) that each low-level command will take to complete.

Example

Run the following command to rebalance partitions:

REBALANCE PARTITIONS ON mydb;

View the status of REBALANCE PARTITIONS while it is still running:

SHOW REBALANCE STATUS ON mydb;
****
+-----------------------------------+---------+-------------+-------------+-------+-----------+--------------+-----------------------------+
| Action                            | Ordinal | Target_Host | Target_Port | Phase | Status    | Running_Time | Estimated_Time_Remaining_Ms |
+-----------------------------------+---------+-------------+-------------+-------+-----------+--------------+-----------------------------+
| COPY PARTITION                    | 13      | 127.0.0.1   | 10002       | 3     | success   | 4009         | 0                           |
| COPY PARTITION                    | 2       | 127.0.0.1   | 10003       | 4     | success   | 5109         | 0                           |
| COPY PARTITION                    | 2       | 127.0.0.1   | 10004       | 4     | success   | 5112         | 0                           |
| PROMOTE PARTITION WITH DROP FORCE | 2       | 127.0.0.1   | 10003       | 5     | running   | 405          | 1130                        |
| DROP PARTITION                    | 2       | 127.0.0.1   | 10002       | 6     | scheduled | NULL         | 1002                        |
| DROP PARTITION                    | 13      | 127.0.0.1   | 10004       | 6     | scheduled | NULL         | 1002                        |
+-----------------------------------+---------+-------------+-------------+-------+-----------+--------------+-----------------------------+

Note: The Status displays success for the activities that are already complete. The Estimated_Time_Remaining_Ms displays the estimated remaining time (in milliseconds) for each low-level command to complete.

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