David Taieb created TOREE-374:
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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.
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