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Repartition mechanism on adding new data node to TimescaleDB cluster.
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| postgres=# SELECT * FROM timescaledb_information.hypertables; | |
| -[ RECORD 1 ]-------+-------------------------- | |
| hypertable_schema | public | |
| hypertable_name | telemetries | |
| owner | postgres | |
| num_dimensions | 2 | |
| num_chunks | 106 | |
| compression_enabled | f | |
| is_distributed | t | |
| replication_factor | 1 | |
| data_nodes | {data_node_1,data_node_2} | |
| tablespaces | | |
| postgres=# SELECT * FROM timescaledb_information.dimensions; | |
| -[ RECORD 1 ]-----+------------------------- | |
| hypertable_schema | public | |
| hypertable_name | telemetries | |
| dimension_number | 1 | |
| column_name | time | |
| column_type | timestamp with time zone | |
| dimension_type | Time | |
| time_interval | 7 days | |
| integer_interval | | |
| integer_now_func | | |
| num_partitions | | |
| -[ RECORD 2 ]-----+------------------------- | |
| hypertable_schema | public | |
| hypertable_name | telemetries | |
| dimension_number | 2 | |
| column_name | imei | |
| column_type | text | |
| dimension_type | Space | |
| time_interval | | |
| integer_interval | | |
| integer_now_func | | |
| num_partitions | 2 | |
| --- | |
| postgres=# SELECT * FROM attach_data_node('data_node_3', 'telemetries', repartition => TRUE); | |
| NOTICE: the number of partitions in dimension "imei" was increased to 3 | |
| DETAIL: To make use of all attached data nodes, a distributed hypertable needs at least as many partitions in the first closed (space) dimension as there are attached data nodes. | |
| -[ RECORD 1 ]------+------------ | |
| hypertable_id | 1 | |
| node_hypertable_id | 1 | |
| node_name | data_node_3 | |
| --- | |
| postgres=# SELECT * FROM timescaledb_information.hypertables; | |
| -[ RECORD 1 ]-------+-------------------------------------- | |
| hypertable_schema | public | |
| hypertable_name | telemetries | |
| owner | postgres | |
| num_dimensions | 2 | |
| num_chunks | 106 | |
| compression_enabled | f | |
| is_distributed | t | |
| replication_factor | 1 | |
| data_nodes | {data_node_1,data_node_2,data_node_3} | |
| tablespaces | | |
| postgres=# SELECT * FROM timescaledb_information.dimensions; | |
| -[ RECORD 1 ]-----+------------------------- | |
| hypertable_schema | public | |
| hypertable_name | telemetries | |
| dimension_number | 1 | |
| column_name | time | |
| column_type | timestamp with time zone | |
| dimension_type | Time | |
| time_interval | 7 days | |
| integer_interval | | |
| integer_now_func | | |
| num_partitions | | |
| -[ RECORD 2 ]-----+------------------------- | |
| hypertable_schema | public | |
| hypertable_name | telemetries | |
| dimension_number | 2 | |
| column_name | imei | |
| column_type | text | |
| dimension_type | Space | |
| time_interval | | |
| integer_interval | | |
| integer_now_func | | |
| num_partitions | 3 | |
| --- | |
| postgres=# SELECT * FROM set_number_partitions('telemetries', 12, 'imei'); | |
| -[ RECORD 1 ]---------+- | |
| set_number_partitions | | |
| --- | |
| postgres=# SELECT * FROM timescaledb_information.hypertables; | |
| -[ RECORD 1 ]-------+-------------------------------------- | |
| hypertable_schema | public | |
| hypertable_name | telemetries | |
| owner | postgres | |
| num_dimensions | 2 | |
| num_chunks | 106 | |
| compression_enabled | f | |
| is_distributed | t | |
| replication_factor | 1 | |
| data_nodes | {data_node_1,data_node_2,data_node_3} | |
| tablespaces | | |
| postgres=# SELECT * FROM timescaledb_information.dimensions; | |
| -[ RECORD 1 ]-----+------------------------- | |
| hypertable_schema | public | |
| hypertable_name | telemetries | |
| dimension_number | 1 | |
| column_name | time | |
| column_type | timestamp with time zone | |
| dimension_type | Time | |
| time_interval | 7 days | |
| integer_interval | | |
| integer_now_func | | |
| num_partitions | | |
| -[ RECORD 2 ]-----+------------------------- | |
| hypertable_schema | public | |
| hypertable_name | telemetries | |
| dimension_number | 2 | |
| column_name | imei | |
| column_type | text | |
| dimension_type | Space | |
| time_interval | | |
| integer_interval | | |
| integer_now_func | | |
| num_partitions | 12 |
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