[jira] [Created] (TOREE-374) Variables declared on the Notebook are not garbage collected

["David Taieb (JIRA)" <ji...@apache.org>]

David Taieb created TOREE-374:
---------------------------------

             Summary: Variables declared on the Notebook are not garbage collected
                 Key: TOREE-374
                 URL: https://issues.apache.org/jira/browse/TOREE-374
             Project: TOREE
          Issue Type: Bug
    Affects Versions: 0.1.0
            Reporter: David Taieb


I'm not sure if it's a bug or a limitation of the underlying scala REPL.
As part of supporting PixieDust (https://github.com/ibm-cds-labs/pixiedust) auto-visualization feature within Scala gateway, I have implemented a weak hashmap that tracks objects declared on the Scala REPL. However, I have found that objects are not correctly gc'ed when the object is declared in a cell with a val or var keyword and then the cell is ran again. One would expect that the original object has no more references and should be gc'ed but it's not. 
However, when the object is declare with var keyword and then set to null in another cell, then it is correctly gc'ed.

I'm concerned that users who run the same cell multiple times would unwittingly have memory leaks which can eventually lead to OOM errors.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)