sanha commented on a change in pull request #190: [NEMO-328] Refactor IRDAG
URL: https://github.com/apache/incubator-nemo/pull/190#discussion_r250465045
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File path:
compiler/optimizer/src/main/java/org/apache/nemo/compiler/optimizer/pass/compiletime/reshaping/SkewReshapingPass.java
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@@ -47,17 +41,13 @@
/**
* Pass to reshape the IR DAG for skew handling.
- *
- * This pass inserts vertices to perform two-step dynamic optimization for
skew handling.
- * 1) Task-level statistic collection is done via vertex with {@link
MetricCollectTransform}
- * 2) Stage-level statistic aggregation is done via vertex with {@link
AggregateMetricTransform}
- * inserted before shuffle edges.
+ * We insert a {@link MessageBarrierVertex for each shuffle edge}
Review comment:
We **must** optimize multiple shuffle edges at once if a vertex receives
many shuffle edges. Please check
[327](https://issues.apache.org/jira/projects/NEMO/issues/NEMO-327?filter=allopenissues).
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