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https://issues.apache.org/jira/browse/STORM-789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14502982#comment-14502982
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ASF GitHub Bot commented on STORM-789:
--------------------------------------
Github user dan-blanchard commented on a diff in the pull request:
https://github.com/apache/storm/pull/525#discussion_r28696363
--- Diff: storm-core/src/jvm/backtype/storm/task/TopologyContext.java ---
@@ -154,6 +154,18 @@ public Fields getThisOutputFields(String streamId) {
}
/**
+ * Gets the declared output fields for the specified stream id for the
component
+ * this task is a part of.
+ */
+ public Map<String, List<String>> getThisOutputFieldsForStreams() {
+ Map<String, List<String>> streamToFields = new HashMap<String,
List<String>>();
+ for (String stream : this.getThisStreams()) {
+ streamToFields.put(stream,
this.getThisOutputFields(stream).toList());
--- End diff --
I'm not a big Java guy, so what's the appropriate spacing here? Tabs or
spaces? And how many?
> Enhance topology context sent to multi-lang bolts and spouts
> ------------------------------------------------------------
>
> Key: STORM-789
> URL: https://issues.apache.org/jira/browse/STORM-789
> Project: Apache Storm
> Issue Type: Improvement
> Reporter: Dan Blanchard
> Assignee: Dan Blanchard
>
> I'm about to submit a pull request that adds a lot more contextual
> information to the "context" JSON dictionary that gets sent to multi-lang
> bolts and spouts as part of their initial handshake. These additions will
> make is so non-JVM developers have access to the sources, targets, and field
> names for their bolts and spouts.
> We will add support for this in streamparse (one of the more popular Python
> libraries for Storm) as soon as this gets merged in.
> Here are the details of what I've added:
> - componentid: the component ID for this task, so you don't have to look it
> up
> in "task->component" by "taskid"
> - streams: a list of all of the streams for this task
> - stream->outputfields: a mapping from stream names to output fields for
> that
> stream
> - stream->target->grouping: a mapping from stream names to the targets for
> this
> task to the kind of grouping they use.
> - sources->grouping: a mapping from the component IDs of the sources to
> their
> grouping.
> Note on groupings: groupings are either represented as a string (e.g.,
> "SHUFFLE") or a list of strings for field groupings.
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