Uber Migrates 1 Trillion Records from DynamoDB to LedgerStore to Save $6 Million Annually
Briefly

LedgerStore is an immutable storage solution at Uber that provides verifiable data completeness and correctness guarantees to ensure data integrity for these transactions...bring in the need for trillions of indexes to index hundreds of billions of ledgers.
LedgerStore supports strongly and eventually consistent indexes. For strongly consistent indexes, the data store uses a 2-phase commit...asynchronously committed or rolled back in case of failure.
Read at InfoQ
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