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From "Andy Seaborne (JIRA)" <>
Subject [jira] [Commented] (JENA-118) SDB can't concurrently write (duplicate key error)
Date Wed, 21 Sep 2011 13:53:09 GMT


Andy Seaborne commented on JENA-118:

(not able to test this just at the moment - this is from looking at the code)

Is there an UNLOCK somewhere?

Re: "a bit heavy" -- It seems better to have a safe, working system even if that incurs some
costs.  If it's too expensive (unproven), then a better way to provide the safe usage needs
to be found, not remove the locking.

> SDB can't concurrently write (duplicate key error)
> --------------------------------------------------
>                 Key: JENA-118
>                 URL:
>             Project: Jena
>          Issue Type: Improvement
>          Components: SDB
>            Reporter: Damian Steer
>            Assignee: Damian Steer
>         Attachments: lock-pg.patch
>   Original Estimate: 96h
>  Remaining Estimate: 96h
> Multiple concurrent writes in SDB can break because duplicates can appear despite the
join-based duplicate suppression. Typically the users sees something like:
> org.postgresql.util.PSQLException: ERROR: duplicate key value violates unique constraint

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