Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/21114
can we do this?
```
var acc = ...
... // launch a long running job
val accId = acc.getId
acc = null
gc
... // job finished
```
accumulator is created by users so we have to be prepared for any
situations. That's why we use weak reference at the first place.
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