Verification of Snapshot Isolation in Transactional Memory Java Programs

Dias, Ricardo; Distefano, Dino; Seco, João Costa; Lourenço, João

doi:10.1007/978-3-642-31057-7_28

Cited by 6 publications

(8 citation statements)

References 12 publications

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“…Hyflow [50] allows various modes of accessing objects needed by a transaction: migrating them locally and caching (data flow) or invoking remote calls on them (control flow). StarTM [51] uses static code analysis to select between the execution satisfying snapshot isolation (SI) and serializability for increased performance.…”

Section: Protocol Switchingmentioning

confidence: 99%

Hybrid Transactional Replication: State-Machine and Deferred-Update Replication Combined

Kobus

Kokociński

Wojciechowski

2018

IEEE Trans. Parallel Distrib. Syst.

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Abstract-We propose Hybrid Transactional Replication (HTR) a novel replication scheme for highly dependable services. It combines two schemes: a transaction is executed either optimistically by only one service replica in the deferred update mode (DU), or deterministically by all replicas in the state machine mode (SM); the choice is made by an oracle. The DU mode allows for parallelism and thus takes advantage of multicore hardware. In contrast to DU, the SM mode guarantees abort-free execution, so it is suitable for irrevocable operations and transactions generating high contention. For expressiveness, transactions can be discarded or retried on demand. We formally prove that the higher flexibility of the scheme does not come at the cost of weaker guarantees for clients: HTR satisfies strong consistency guarantees akin to those provided by other popular transactional replication schemes such as Deferred Update Replication. We developed HTR-enabled Paxos STM, an object-based distributed transactional memory system, and evaluated it thoroughly under various workloads. We show the benefits of using a novel oracle, which relies on machine learning techniques for automatic adaptation to changing conditions. In our tests, the ML-based oracle provides up to 50% improvement in throughput when compared to the system running with DU-only or SM-only oracles. Our approach is inspired by a well known algorithm used in the context of the multi-armed bandit problem.

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Section: Protocol Switchingmentioning

confidence: 99%

Hybrid Transactional Replication: State-Machine and Deferred-Update Replication Combined

Kobus

Kokociński

Wojciechowski

2018

IEEE Trans. Parallel Distrib. Syst.

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“…Especially for long-running transactions, this leads to state explosion as an unbounded history of already committed transactions needs to be stored, rendering it impractical for a hardware implementation. This overhead problem led to the development of techniques based on static analysis to detect SI anomalies in TM programs, as in Dias et al [2012], and Kuru et al [2014]. These techniques, however, only allowed detection of SI anomalies and did not address the problem of correcting them.…”

Section: Dependency Graph Analysismentioning

confidence: 99%

“…We emphasize that achieving absolute correctness is not the main objective of our tool. We regard the proof of correctness as orthogonal, which is addressed by Dias et al [2012] and Kuru et al [2014]. Instead, our goal is to provide programmers with a helpful tool that can automatically repair both legacy and newly written applications with minimal performance impact.…”

Section: Correctnessmentioning

confidence: 99%

“…-How to determine whether a program is susceptible to incorrect execution due to si-anomalies -How to correct a program if it exhibits si-anomalies The first issue is addressed by previous works such as Dias et al [2012] and Kuru et al [2014]. In the former, the authors developed an automatic verification technique to assert whether a program executed under SI may generate si-anomalies during its execution.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Correction of Anomalies in Snapshot Isolation Transactions

Litz

Dias

Cheriton

2015

ACM Trans. Archit. Code Optim.

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Transactional memory systems providing snapshot isolation enable concurrent access to shared data without incurring aborts on read-write conflicts. Reducing aborts is extremely relevant as it leads to higher concurrency, greater performance, and better predictability. Unfortunately, snapshot isolation does not provide serializability as it allows certain anomalies that can lead to subtle consistency violations. While some mechanisms have been proposed to verify the correctness of a program utilizing snapshot isolation transactions, it remains difficult to repair incorrect applications. To reduce the programmer's burden in this case, we present a technique based on dynamic code and graph dependency analysis that automatically corrects existing snapshot isolation anomalies in transactional memory programs. Our evaluation shows that corrected applications retain the performance benefits characteristic of snapshot isolation over conventional transactional memory systems.

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“…Additionally, our system considers a much wider set of parameters and can be tuned by the programmer for the application-specific characteristics. StarTM [31] uses static code analysis to select between the execution satisfying snapshot isolation (SI) and one-copy serializability (1SR). Serializability is ensured at all times, since the system executes transactions in the SI mode only when it is guaranteed that no write-skew anomalies can occur.…”

Section: Related Workmentioning

confidence: 99%

Hybrid Replication: State-Machine-Based and Deferred-Update Replication Schemes Combined

Kobus

Kokociński

Wojciechowski

2013

2013 IEEE 33rd International Conference on Distributed Computing Systems

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Abstract-We propose a novel algorithm for hybrid transactional replication (HTR) of highly dependable services. It combines two schemes: a transaction is executed either optimistically by only one service replica in the deferred update mode (DU), or deterministically by all replicas in the state machine mode (SM); the choice is made by an oracle. The DU mode allows for parallelism and thus takes advantage of multicore hardware. In contrast to DU, the SM mode guarantees abort-free execution, so it is suitable for irrevocable operations and transactions generating high contention. For expressiveness, transactions can be discarded or retried on demand. We developed HTR-enabled Paxos STM, an object-based distributed transactional memory system, and evaluated it using several benchmarks: Bank, Distributed STMBench7, and Twitter Clone. We tested our system under various workloads and three oracle types: DU and SM, which execute all transactions in one mode, and Hybrid-tailored specifically for each benchmark-which selects a mode for each transaction dynamically based on various parameters. In all our tests, the Hybrid oracle is not worse than DU and SM and outperforms them when the number of replicas grows.

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Verification of Snapshot Isolation in Transactional Memory Java Programs

Cited by 6 publications

References 12 publications

Hybrid Transactional Replication: State-Machine and Deferred-Update Replication Combined

Hybrid Transactional Replication: State-Machine and Deferred-Update Replication Combined

Efficient Correction of Anomalies in Snapshot Isolation Transactions

Hybrid Replication: State-Machine-Based and Deferred-Update Replication Schemes Combined

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