Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/750#discussion_r49442110
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/jobgraph/tasks/Stoppable.java
---
@@ -0,0 +1,23 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
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+package org.apache.flink.runtime.jobgraph.tasks;
+
+/**
+ * Must be implemented by stoppable tasks.
--- End diff --
What are stoppable tasks? Maybe a bit more context would be helpful. E.g.
it should only be implemented by streaming sources, the method `stop` is called
when the JM receives a stop message, etc.
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