Github user vrozov commented on a diff in the pull request:
https://github.com/apache/incubator-apex-core/pull/301#discussion_r59321286
--- Diff: engine/src/main/java/com/datatorrent/stram/stream/OiOStream.java
---
@@ -29,11 +29,12 @@
*
* @since 0.3.5
*/
-public class OiOStream implements Stream, SweepableReservoir
--- End diff --
Let's say upstream operator puts n tuples into OiOStream, both
`Sink.getCount(true)` and `SweepableReservoir.getCount(true)` should return n
and reset count to 0. If there is only one count, only one call (whichever
comes first) would return n, the second one would return 0.
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