Identifying Orphaned Partitions

Warning

SingleStore 9.0 gives you the opportunity to preview, evaluate, and provide feedback on new and upcoming features prior to their general availability. In the interim, SingleStore 8.9 is recommended for production workloads, which can later be upgraded to SingleStore 9.0.

To easily determine if your cluster has any orphaned partitions, run:

SQL

EXPLAIN REBALANCE PARTITIONS ON <database name>;

If there are any unbalanced partitions, a non-empty result set will be returned. If this is the case, run SHOW CLUSTER STATUS and SHOW PARTITIONS to see the details of your partitions:

Example:

SQL

SHOW CLUSTER STATUS;

| Host      | Port  | Database | Role      | State       | Position | Details |
+-----------+-------+----------+-----------+-------------+----------+---------+
| 127.0.0.1 | 10001 | x_test   | Reference | replicating | 0:57     |         |
| 127.0.0.1 | 10001 | x_test_0 | Master    | online      | 0:10     |         |
| 127.0.0.1 | 10001 | x_test_1 | Replica   | replicating | 0:10     |         |
| 127.0.0.1 | 10002 | x_test   | Reference | replicating | 0:57     |         |
| 127.0.0.1 | 10002 | x_test_0 | Replica   | replicating | 0:10     |         |
| 127.0.0.1 | 10002 | x_test_1 | Orphan    | online      | 0:10     |         |

SQL

SHOW PARTITIONS;

+---------+-----------+-------+---------+--------+
| Ordinal | Host      | Port  | Role    | Locked |
+---------+-----------+-------+---------+--------+
| 0       | 127.0.0.1 | 10001 | Master  | 0      |
| 0       | 127.0.0.1 | 10002 | Replica | 0      |
| 1       | 127.0.0.1 | 10001 | Replica | 0      |
+---------+-----------+-------+---------+--------+

Identifying Orphaned Partitions

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