Github user yingdachen commented on a diff in the pull request:
https://github.com/apache/tez/pull/33#discussion_r232082409
--- Diff:
tez-api/src/main/java/org/apache/tez/dag/api/TezConfiguration.java ---
@@ -408,6 +409,18 @@ public TezConfiguration(boolean loadDefaults) {
+ "launch.env";
public static final String TEZ_AM_LAUNCH_ENV_DEFAULT = "";
+ /**
+ * String value. Describes the timing of scheduling downstream vertex
tasks
+ * when the vertex has a concurrent input edge.
--- End diff --
I have expand the comment a bit in an effort to make it easier to
understand.
Not using the event name directly is due to the subtle difference between
event and scheduling actually being kicked off: for example, in the case of
"SOURCE_TASK_STARTED", the scheduling is not triggered by any TASK_STARTED
event, but instead it will only be triggered after enough TASK_STARTED events
have been collected (for example, all the upstream tasks are running). For the
lack of a better choice, I think defining a TriggerType is easier to expand in
the long run too.
---
