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https://hdl.handle.net/1822/51489
Título: | DottedDB: anti-entropy without merkle trees, deletes without tombstones |
Autor(es): | Gonçalves, Ricardo Jorge Tomé Almeida, Paulo Sérgio Baquero, Carlos Fonte, Victor |
Palavras-chave: | Anti-entropy Causality Distributed databases Logical clocks Merkle trees Partial replication |
Data: | 2017 |
Editora: | Institute of Electrical and Electronics Engineers (IEEE) |
Revista: | Proceedings of the Ieee Symposium on Reliable Distributed Systems |
Resumo(s): | To achieve high availability in the face of network partitions, many distributed databases adopt eventual consistency, allow temporary conflicts due to concurrent writes, and use some form of per-key logical clock to detect and resolve such conflicts. Furthermore, nodes synchronize periodically to ensure replica convergence in a process called anti-entropy, normally using Merkle Trees. We present the design of DottedDB, a Dynamo-like key-value store, which uses a novel node-wide logical clock framework, overcoming three fundamental limitations of the state of the art: (1) minimize the metadata per key necessary to track causality, avoiding its growth even in the face of node churn; (2) correctly and durably delete keys, with no need for tombstones; (3) offer a lightweight anti-entropy mechanism to converge replicated data, avoiding the need for Merkle Trees. We evaluate DottedDB against MerkleDB, an otherwise identical database, but using per-key logical clocks and Merkle Trees for anti-entropy, to precisely measure the impact of the novel approach. Results show that: causality metadata per object always converges rapidly to only one id-counter pair; distributed deletes are correctly achieved without global coordination and with constant metadata; divergent nodes are synchronized faster, with less memory-footprint and with less communication overhead than using Merkle Trees. |
Tipo: | Artigo em ata de conferência |
URI: | https://hdl.handle.net/1822/51489 |
ISBN: | 9781538616796 |
DOI: | 10.1109/SRDS.2017.28 |
ISSN: | 1060-9857 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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DottedDB-SRDS2017.pdf | 468,2 kB | Adobe PDF | Ver/Abrir |