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https://issues.apache.org/jira/browse/JENA-118?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Seaborne closed JENA-118.
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> SDB can't concurrently write (duplicate key error)
> --------------------------------------------------
>
> Key: JENA-118
> URL: https://issues.apache.org/jira/browse/JENA-118
> Project: Apache Jena
> Issue Type: Improvement
> Components: SDB
> Reporter: Damian Steer
> Priority: Major
> Fix For: Jena 4.0.0
>
> 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 "nodes_pkey"
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