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From "Maryann Xue (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-2556) Subqueries with nested joins may not free hash cache
Date Tue, 05 Jan 2016 14:11:39 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-2556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15083094#comment-15083094
] 

Maryann Xue commented on PHOENIX-2556:
--------------------------------------

Good reminder, [~jamestaylor]. It was a subquery related bug in TxCheckPointIT, but was because
the MutationPlan for DELETE did not close the ResultIterator. Non-subquery or non-join queries
are fine since they don't have resources to be closed anyway, but it was a problem for subqueries.
I have also checked the UpsertCompiler and it has a try block for closing the iterator so
it should be good.
 
The other two tests were good after I switched back to JDK 7, but they might still be issues
(probably similar to PHOENIX-2257). I'll open another JIRA to track this.

> Subqueries with nested joins may not free hash cache
> ----------------------------------------------------
>
>                 Key: PHOENIX-2556
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-2556
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: James Taylor
>            Assignee: Maryann Xue
>             Fix For: 4.7.0
>
>         Attachments: PHOENIX-2556.patch, PHOENIX-2556_wip.patch
>
>
> Subqueries with nested joins are only freeing some of the server-side hash cache memory,
leading to essentially a kind of memory leak.
> This problem occurs with the existing test case in SubqueryIT:
> {code}
>  SELECT name from Join.CustomerTable 
>  WHERE "customer_id" IN 
>     (SELECT "customer_id" FROM Join.ItemTable i
>      JOIN Join.OrderTable o 
>      ON o."item_id" = i."item_id"
>      WHERE i.name = 'T2'
>      OR quantity >
>          (SELECT avg(quantity) FROM Join.OrderTable q
>           WHERE o."item_id" = q."item_id"))
> {code}



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