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https://issues.apache.org/jira/browse/JENA-1769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16952903#comment-16952903
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Andy Seaborne commented on JENA-1769:
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Ugh - that's bad. It is definitely a bug/regression.
TDB2 can do as well as it ever did by overriding
{{DatasetGraph.listGraphNodes}}.
It still iterates over the store but can do it much, much faster than the
general implementation in {{DatasetGraphStorage}}. There is a lot of "small
object" churn that is unnecessary.
And I very much appreciate the reports and their accuracy.
> Dataset#listNames slow for large TDB2 datasets
> ----------------------------------------------
>
> Key: JENA-1769
> URL: https://issues.apache.org/jira/browse/JENA-1769
> Project: Apache Jena
> Issue Type: Bug
> Components: TDB2
> Affects Versions: Jena 3.13.0
> Reporter: Damien Obrist
> Assignee: Andy Seaborne
> Priority: Major
> Labels: performance
>
> With Jena 3.13.0, the running time of {{Dataset#listNames}} has increased
> significantly for TDB2 datasets.
> I have compared the running times for a sample TDB2 dataset containing
> *1'000'000 triples*. I have observed a running time of *~270ms* with Jena
> 3.12.0 and *~13.5s* with Jena 3.13.0.
> We're using a dataset with many millions of triples and for our use case, the
> running time has increased from seconds to minutes.
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