[jira] [Commented] (JENA-1586) Fuseki does not close files of dataset when the dataset is removed

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

    [ https://issues.apache.org/jira/browse/JENA-1586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16569975#comment-16569975 ] 

Andy Seaborne commented on JENA-1586:
-------------------------------------

Hi Tom - are you using UI itself, or the HTTP operations that back the UI to create/delete datasets? Or some other way?

> Fuseki does not close files of dataset when the dataset is removed
> ------------------------------------------------------------------
>
>                 Key: JENA-1586
>                 URL: https://issues.apache.org/jira/browse/JENA-1586
>             Project: Apache Jena
>          Issue Type: Bug
>          Components: Fuseki
>    Affects Versions: Jena 3.6.0
>         Environment: Debian 9.5 with Jena 3.6.0
>            Reporter: Tom den Braber
>            Priority: Minor
>
> When you remove a TDB-dataset over HTTP from the Fuseki server, Fuseki does not close the file. 
> Steps to reproduce:
> First: create a dataset over HTTP with name 'x'. Then, delete the dataset with name 'x'. Now inspect the open files of the fuseki process by running \{{lsof -p <FUSEKI_PROCESS_ID>}} you see that a dataset with name 'x' is  still opened by the Fuseki-process.
> Impact:
> When a Fuseki process runs for a long time, and many datasets are created and deleted, it will in the end lead to a situation in which you cannot create new datasets anymore. Each attempt to creating a dataset will lead to a HTTP response code 500 with message 'java.nio.file.FileSystemException: /var/lib/fuseki/templates/config-tdb: Too many open files'. Also, keeping the files open leads (I suspect) to a higher memory usage than strictly needed.



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