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Hibernate Shards

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Topiconf 2007

Topiconf 2007

Published in: Technology

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  • Transcript

    • 1. (N)Hibernate Shards Topicus & (Distributed) Databases
    • 2. Wattes?
      • "You can't always put all your relational data in a single relational database. Sometimes you simply have too much data... Whatever your reasons, talking to multiple relational databases inevitably complicates the development of your application.“
      • http://www.hibernate.org/414.html
      07-06-09
    • 3. Hibernate Shards
      • Standard Hibernate programming model
      • Flexible sharding strategies
        • ShardAccessStrategy
        • ShardResolutionStrategy
        • ShardSelectionStrategy
      • Support for virtual shards (Resharding)
      • Free/open source
      07-06-09
    • 4. Hibernate Shards
      • Hibernate + Shards
      •  
      • ShardedSession
      • ShardedSessionFactory
      • ShardedCriteria
      • ShardedQuery
      • Hibernate
      • Session
      • SessionFactory
      • Criteria
      • Query
      1 2 1
    • 5. Recipe for Hibernate Shards
      • Definieer de shards in de configuratie
      • Definieer de Id generator in mappings
        • ShardedTableHiLoGenerator
        • ShardedUUIDGenerator
      • Instantieer de ShardStrategyFactory
      • Gebruik de sharded factory op de plaats van de gewone
    • 6. Distributed?
      • Virtual Shards (Gevaarlijk!)
      • Welk object moet waar?
      • Wat moeten we doen als we mappings aan moeten passen??
      • Tip: Vooraf extra virtual shards
    • 7. Nadelen
      • Id generatie werkt niet via JPA
      • A en B (met een relatie tussen elkaar) mogen niet op aparte shards leven.
      • Base types niet als identifier
      • Replicated data alleen read-only.
      • Sorteren in criteria kan niet
      • Geen HQL.
    • 8. Vragen
      • ?
      07-06-09