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MilkhaTx

Limitations:

  • Does not work with DynamoDBMapper. Users need to build their own marshalling. Library provides abstract marshaller class.
  • Low-level data model is constrained by the immutability assumption.
  • No support for lock stealing. Transactions have to wait for previous transactions to complete or be swept.

Advantages:

  • Supports LSIs, GSIs, Scans and Queries.
  • Consumes less DynamoDB resources.
  • Transactions are low-latency; 10s of milliseconds.

Usage:

  1. Create the TransactionsLog table with hash key "transactionId" and no range key.
  2. Create your DAOs using the HashOnlyMapper or HashAndRangeMapper classes.
  3. Instantiate a TransactionCoordinator object using TransactionCoordinatorBuilder.
  4. Instantiate a TransactionSweeper object using TransactionSweeperBuilder. Kick-off the sweeper using the schedule() method and keep it running in the background.
  5. Use the TransactionCoordinator object's public interface to do useful things.