[jira] [Assigned] (JENA-1414) Performance regression in Model.remove(Model m) method

["Andy Seaborne (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JENA-1414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Seaborne reassigned JENA-1414:
-----------------------------------

    Assignee: Andy Seaborne

> Performance regression in Model.remove(Model m) method
> ------------------------------------------------------
>
>                 Key: JENA-1414
>                 URL: https://issues.apache.org/jira/browse/JENA-1414
>             Project: Apache Jena
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: Jena 3.3.0, Jena 3.4.0
>            Reporter: Michał Woźniak
>            Assignee: Andy Seaborne
>         Attachments: graph_util_improve.patch
>
>
> The Model.remove(Model) works very slow on large models, as it propagates to GraphUtil.deleteFrom(Graph, Graph), which computes size of the target graph by iterating over all triples. This computation takes nearly 100% of the time of the Model.remove(Model) operation.
> It seems this commit introduced the issue: https://github.com/apache/jena/commit/781895ce64e062c7f2268a78189a777c39b92844#diff-fbb4d11dc804464f94c27e33e11b18e8
> Due to this bug deletion of a concept scheme on a large ontology may take several minutes. 



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