GroupBy GroupDurationSubscriber references retained - memory build up

[crunchie84]

RxJS version:
5.4.0

Code to reproduce:

const Rx = require('rxjs/Rx');

Rx.Observable.interval(500)
  .groupBy(
    i => i,
    null,
    i => i.take(1)
  )
  .subscribe(
    null,
    err => console.log('err: ' + err),
    () => console.log('completed')
  );

1. Invoke code using node --debug-brk --inspect index.js
2. attach the chrome debugger
3. take heap snapshot before letting code run
4. after ~30 seconds take another heap snapshot
5. => 60 GroupDurationSubscriber's still around in memory

Expected behaviour:

GroupDurationSubscribers should be removed from the (GroupBy) parent subscription once completed.

Actual behaviour:

GroupDurationSubscribers are retained in memory.

Additional information:

When the GroupDurationSubscriber is completed it invokes this.parent.removeGroup which removes the group but it never invokes this.parent.remove(this) to let the parent (groupBy operator) remove the reference to the GroupDurationSubscriber so it can be garbage collected.

This behaviour was implemented in rxjs4

Only when the GroupBy operator completes are all the subscriptions let go off and garbage collected.

[lock]

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