Stream Window Migration with State Synchronization
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Solution Overview
Problem
There is a need for an efficient method to migrate an adaptive window from one host to another in a stream processing system without causing data loss or duplication, which is critical for maintaining continuous throughput and minimizing downtime in mission-critical applications.
Innovation Solution
A migration method that synchronizes the states of the first and second window operators by using synchronization markers or fixed window sizes to ensure consistency, allowing parallel processing and minimizing downtime while avoiding data loss or duplication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If window migration is performed without synchronization, then migration speed is improved, but data consistency deteriorates (data loss or duplication occurs)
Solution Approach 1:
The system performs preliminary actions by creating the second window operator and synchronizing window states before completing the migration. The synchronization process ensures that the second window operator receives all necessary data units and reaches a consistent state before the first window operator stops processing, thereby preventing data loss or duplication while enabling efficient migration.
Solution Approach 2:
The synchronization mechanism acts as an intermediary between the first and second window operators. It coordinates the migration process by managing the transfer of data units and ensuring that both operators are in a consistent state during the transition, thus maintaining data integrity while enabling migration.
2Reliability
If window states are synchronized during migration, then data consistency is improved, but migration time increases (downtime increases)
Solution Approach 1:
The system maintains continuity of useful action by allowing the second window operator to start processing data units in parallel with the first window operator during the synchronization phase. This parallel processing approach ensures that data consistency is maintained while minimizing the overall migration downtime, as both operators can process data simultaneously rather than sequentially.
3Productivity
If parallel processing is enabled during migration, then throughput is improved, but complexity of coordination increases
Solution Approach 1:
The synchronization mechanism implements feedback control by continuously monitoring the state of both window operators and adjusting the migration process accordingly. The system tracks which data units have been processed by each operator and uses this feedback information to coordinate the migration, ensuring that throughput is maximized while coordination complexity is managed through systematic state tracking and control.
Data Source
AI summary
A migration method is disclosed for migrating a first window of a first window operator (610) from a first host (H1) to a second host (H2). A reconfiguration manager is configured to initiate and manage a migration, comprising creating a second window operator (620) in the second host (H2) and the second window operator (620) having a second window associated with a second window state. The first and the second window operators are configured to receive a stream of data units, add the data units to the first and, respectively, the second window states, and trigger the first and, respectively, the second windows to process or discard the data units in the first and respectively the second window states. The method comprises synchronizing the first and the second window states so that the first and the second window states are consistent upon completion of the migration.