Comments (2)
You are experiencing the so-called group abandonment. Groups produced by groupBy
require an immediate subscription otherwise it can lead to hangs (with Flowable) or excess memory usage (with Observable). concat
delays these subscriptions to one at a time.
From the javadoc
Note also that ignoring groups or subscribing later (i.e., on another thread) will result in so-called group abandonment where a group will only contain one element and the group will be re-created over and over as new upstream items trigger a new group. The behavior is a trade-off between no-dataloss, upstream cancellation and excessive group creation.
So you'll have to merge the groups or collect each group then re-emit them later
values.groupBy(e -> e.departmentId)
.flatMapSingle(v -> v.toList())
.concatMapIterable(v -> v)
.subscribe(System.out::println);
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i get it, thanks for your reply!
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