[teiid-issues] [JBoss JIRA] (TEIID-4815) How could I debug JDV memory allocation properly

[Steven Hawkins (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-4815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13380502#comment-13380502 ] 

Steven Hawkins commented on TEIID-4815:
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Once a query has finished processing and the result set has been closed there should be little or nothing still held in memory.  There's not much to go by here. You would need to provide:

- your Teiid memory settings
- server log
- ideally a heap dump or profiler analysis of the heap showing the retained object sizes/counts

> How could I debug JDV memory allocation properly
> ------------------------------------------------
>
>                 Key: TEIID-4815
>                 URL: https://issues.jboss.org/browse/TEIID-4815
>             Project: Teiid
>          Issue Type: Feature Request
>            Reporter: Rafael Coutinho
>            Assignee: Steven Hawkins
>         Attachments: Screenshot from 2017-03-17 17-54-24.png, Screenshot from 2017-03-17 18-14-50.png
>
>
> We hare having trouble with memory allocation on our JDV server (using Red Hat JBoss Data Virtualization - Version 6.3.0) for some reason memory gets allocated but never released.
> For simple queries memory increases just a little, however when we make complex joins etc, we are seeing scenarios with 20GB+ allocated heap. 
> I wonder if there is any inspection tool for debugging what is consuming it in JDV.
> Our main datasource is an Oracle DS, but we do have a MariaDB being used too. 



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