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

["Tom den Braber (JIRA)" <ji...@apache.org>]

Tom den Braber created JENA-1586:
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             Summary: 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


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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