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https://issues.apache.org/jira/browse/TOREE-374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15856177#comment-15856177
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Gino Bustelo commented on TOREE-374:
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I'm not a JVM expert, but [~dtaieb], you need to consider that you are not in a
normal execution environment. Those steps are not taking place in a single
class... each time you execute a cell, there is a class that is generated that
imports the previous classes from a previous cell. You basically get a
hierarchy of nested classes. There might be side effects to that.
[~jodersky] brings a good point. Try that set of calls in the scala repl and
lets compare.
> 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.
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