Github user tweise commented on a diff in the pull request:
https://github.com/apache/incubator-apex-core/pull/148#discussion_r47044122
--- Diff: api/src/main/java/com/datatorrent/api/Module.java ---
@@ -21,8 +21,136 @@
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
+import com.datatorrent.api.Context.PortContext;
+import com.datatorrent.api.Operator.InputPort;
+import com.datatorrent.api.Operator.OutputPort;
+import com.datatorrent.api.Operator.Unifier;
+
+/**
+ * A Module is a component which can be added to the DAG similar to the
operator,
+ * using addModule API. The module should implement populateDAG method,
which
+ * will be called by the platform, and DAG populated by the module will be
+ * replaced in place of the module.
+ *
+ */
@InterfaceStability.Evolving
public interface Module
{
void populateDAG(DAG dag, Configuration conf);
+
--- End diff --
Modules are developed independently and therefore not look for the same
key. This needs to be supported at the app configuration level and I believe
the is a JIRA for it. Example:
```
op1.prop.someschema = ${theschema}
op2.prop.anotherschema = ${theschema}
```
Having said that, the conf object can be useful for other purposes, such as
looking up Hadoop values and it is consistent with the StreamingApplication
interface.
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