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https://issues.apache.org/jira/browse/LENS-1345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15547941#comment-15547941
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Rajat Khandelwal commented on LENS-1345:
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The solution is to not fetch the driver result set in the constructor of
FinishedQuery, rather fetch it when it's required, which happens in QueryPurger
-- a different thread, so the original thread isn't blocked.
> Deadlock in jdbc query status update
> ------------------------------------
>
> Key: LENS-1345
> URL: https://issues.apache.org/jira/browse/LENS-1345
> Project: Apache Lens
> Issue Type: Bug
> Reporter: Rajat Khandelwal
> Assignee: Rajat Khandelwal
>
> JDBC query is launched in a thread. On query finish, the thread calls back
> the query service to update status, which creates a FinishedQuery instance.
> In the constructor, FinishedQuery is fetching result from the jdbc driver,
> which waits on the original thread to complete. Basically the thread is
> waiting for itself.
> In the callback, query context is acquired by the thread, and can't be
> acquired again. Which means that get calls for this query won't return and
> will stay blocked. This can end up blocking all the grizzly threads.
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