Configurations for Consensus Commit
Consensus Commit transaction manager is the default transaction manager type in ScalarDB.
If you don’t specify the scalar.db.transaction_manager property, or you specify consensus-commit for the property as follows, the Consensus Commit transaction manager is used.
scalar.db.transaction_manager=consensus-commit
The following sections describes the configurations for Consensus Commit.
Basic configurations
The basic configurations for Consensus Commit are as follows:
| name | description | default |
|---|---|---|
| scalar.db.consensus_commit.isolation_level | Isolation level used for ConsensusCommit. Either SNAPSHOT or SERIALIZABLE can be specified. |
SNAPSHOT |
| scalar.db.consensus_commit.serializable_strategy | Serializable strategy used for ConsensusCommit transaction manager. Either EXTRA_READ or EXTRA_WRITE can be specified. If SNAPSHOT is specified in the property scalar.db.consensus_commit.isolation_level, this is ignored. |
EXTRA_READ |
| scalar.db.consensus_commit.coordinator.namespace | Namespace name of coordinator tables. | coordinator |
Performance related configurations
The Performance related configurations for Consensus Commit are as follows:
| name | description | default |
|---|---|---|
| scalar.db.consensus_commit.parallel_executor_count | The number of the executors (threads) for the parallel execution. | 128 |
| scalar.db.consensus_commit.parallel_preparation.enabled | Whether or not the preparation phase is executed in parallel. | true |
| scalar.db.consensus_commit.parallel_validation.enabled | Whether or not the validation phase (in EXTRA_READ) is executed in parallel. |
The value of scalar.db.consensus_commit.parallel_commit.enabled |
| scalar.db.consensus_commit.parallel_commit.enabled | Whether or not the commit phase is executed in parallel. | true |
| scalar.db.consensus_commit.parallel_rollback.enabled | Whether or not the rollback phase is executed in parallel. | The value of scalar.db.consensus_commit.parallel_commit.enabled |
| scalar.db.consensus_commit.async_commit.enabled | Whether or not the commit phase is executed asynchronously. | false |
| scalar.db.consensus_commit.async_rollback.enabled | Whether or not the rollback phase is executed asynchronously. | The value of scalar.db.consensus_commit.async_commit.enabled |