Github user davidyan74 commented on a diff in the pull request:
https://github.com/apache/incubator-apex-core/pull/185#discussion_r48897460
--- Diff:
engine/src/main/java/com/datatorrent/stram/engine/GenericNode.java ---
@@ -343,12 +389,15 @@ else if (!doCheckpoint) {
* we will receive tuples which are equal to the number of
input streams.
*/
activePort.remove();
- buffers.remove();
+ if
(isInputPortConnectedToDelayOperator(activePortEntry.getKey())) {
+ break; // breaking out of the switch/case
+ }
+ buffers.remove();
--- End diff --
if ```buffers.remove()``` is before the ```if``` condition, the port will
not be considered as active any more for this window, which may already have
started since the other ports may have sent BEGIN_WINDOW before we get the
RESET_WINDOW from the port connected to the delay operator. In that case, the
operator would get stuck.
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