version 5.5.1 Sharding algorithm HASH_MOD initialization failed...

[zt9788]

use version 5.5.1(Sharding-JDBC) the when program start there will be throw a exception.
the error is same too #31964

Sharding algorithm HASH_MOD initialization failed, table xxx tables sharding configuration can not use auto sharding algorithm...

I have table session, session_0 ...session_15
it is can work in version 5.3.2

the config is:

            sharding:
              tables:
                session:
                  actual-data-nodes: session_${0..15}
                  table-strategy:
                    standard:
                      sharding-column: uid
                      sharding-algorithm-name: session_hash_mod                  
              sharding-algorithms:
                session_hash_mod:
                  type: HASH_MOD
                  props:
                    sharding-count: 16

i saw the code sharding-jdbc will check the shardingAlgorithm is ShardingAutoTableAlgorithm
i change the HASH_MOD to INLINE it is have no exception.

private void checkManualShardingAlgorithm(String shardingAlgorithmName, String logicTable) {
        ShardingAlgorithm shardingAlgorithm = (ShardingAlgorithm)this.shardingAlgorithms.get(shardingAlgorithmName);
        ShardingSpherePreconditions.checkState(!(shardingAlgorithm instanceof ShardingAutoTableAlgorithm), () -> {
            return new AlgorithmInitializationException(shardingAlgorithm, "`%s` tables sharding configuration can not use auto sharding algorithm.", new Object[]{logicTable});
        });
    }

so how to fix it?

[terrymanu]

HASH_MOD can use in auto tables only.

[zt9788]

@terrymanu
i saw the doc that

  autoTables: # Auto Sharding table configuration
    t_order_auto: # Logic table name
      actualDataSources (?): # Data source names
      shardingStrategy: # Sharding strategy
        standard: # For single sharding column scenario
          shardingColumn: # Sharding column name
          shardingAlgorithmName: # Auto sharding algorithm name

auto table only have actualDataSources, there is have no actual-data-nodes, so , if i want use the hash to sharding table , i only use other way?

[terrymanu]

Please just follow the document.
The document does not specify that there is no such configuration.

[zt9788]

@terrymanu

I don't understand why the hash_mod sharding configuration of tables is not supported, but it is supported in the lower version (5.3.2). Is it for any consideration? In this case, the higher version is not compatible
Of course, I can continue implementing hash partitioning through inline, but there will be many changes