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https://issues.apache.org/jira/browse/BEAM-2939?focusedWorklogId=167819&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-167819
]
ASF GitHub Bot logged work on BEAM-2939:
----------------------------------------
Author: ASF GitHub Bot
Created on: 20/Nov/18 16:43
Start Date: 20/Nov/18 16:43
Worklog Time Spent: 10m
Work Description: lukecwik commented on a change in pull request #6969:
[BEAM-2939] SplittableDoFn Java SDK API Changes
URL: https://github.com/apache/beam/pull/6969#discussion_r234817654
##########
File path:
sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/DoFn.java
##########
@@ -725,14 +731,30 @@ public Duration getAllowedTimestampSkew() {
* href="https://s.apache.org/splittable-do-fn";>splittable</a> {@link DoFn}
into multiple parts to
* be processed in parallel.
*
- * <p>Signature: {@code List<RestrictionT> splitRestriction( InputT element,
RestrictionT
- * restriction);}
+ * <p>The signature of this method must satisfy the following constraints:
+ *
+ * <ul>
+ * <li>One of its parameters must be the {@code InputT} element.
+ * <li>One of its parameters must be the restriction.
+ * <li>One of its input parameters must be of type {@link Backlog}.
Splitting the restriction
+ * should attempt to take the backlog information into account. If the
backlog is known,
+ * each split should return a restriction with an approximate amount
of work bounded by the
+ * backlog. In the case of an unbounded restriction, at most one of
the splits can represent
+ * the unbounded portion of work. If the backlog that is specified is
unknown, it is up to
+ * the SDK to choose a number of splits of approximately equally sized
portions with
+ * potentially one of those splits representing the unbounded portion
of work.
+ * <li>One of its parameters must be the output receiver for restrictions.
+ * </ul>
+ *
+ * <p>Signature: {@code splitRestriction(InputT element, RestrictionT
restriction, Backlog
+ * backlog, OutputReceiver<RestrictionT> receiver);}
*
* <p>Optional: if this method is omitted, the restriction will not be split
(equivalent to
- * defining the method and returning {@code
Collections.singletonList(restriction)}).
+ * defining the method and outputting {@code
Collections.singletonList(restriction)}).
+ *
+ * <p>TODO: Make the InputT parameter optional.
Review comment:
It wouldn't break it. Done.
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Issue Time Tracking
-------------------
Worklog Id: (was: 167819)
Time Spent: 7h (was: 6h 50m)
> Fn API streaming SDF support
> ----------------------------
>
> Key: BEAM-2939
> URL: https://issues.apache.org/jira/browse/BEAM-2939
> Project: Beam
> Issue Type: Improvement
> Components: beam-model
> Reporter: Henning Rohde
> Assignee: Luke Cwik
> Priority: Major
> Labels: portability
> Time Spent: 7h
> Remaining Estimate: 0h
>
> The Fn API should support streaming SDF. Detailed design TBD.
> Once design is ready, expand subtasks similarly to BEAM-2822.
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