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https://issues.apache.org/jira/browse/FLINK-5891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15879742#comment-15879742
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Xingcan Cui edited comment on FLINK-5891 at 2/23/17 5:38 AM:
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Hi Greg, may I ask what does "when object reuse enabled" mean here? Is it
necessary to make a copy of the attribute min before storing it?
I got it here. :)
[https://ci.apache.org/projects/flink/flink-docs-release-1.2/dev/batch/index.html#operating-on-data-objects-in-functions]
Is it safe to store the value wrapped in a message?
was (Author: xccui):
Hi Greg, may I ask what does "when object reuse enabled" mean here? Is it
necessary to make a copy of the attribute min before storing it?
I got it here. :)
[https://ci.apache.org/projects/flink/flink-docs-release-1.2/dev/batch/index.html#operating-on-data-objects-in-functions]
> ConnectedComponents is broken when object reuse enabled
> -------------------------------------------------------
>
> Key: FLINK-5891
> URL: https://issues.apache.org/jira/browse/FLINK-5891
> Project: Flink
> Issue Type: Bug
> Components: Gelly
> Affects Versions: 1.3.0
> Reporter: Greg Hogan
>
> {{org.apache.flink.graph.library.ConnectedComponents.CCUpdater#updateVertex}}
> is storing a value from its iterator.
> {{GSAConnectedComponents}} does not have this limitation.
> {code}
> public static final class CCUpdater<K, VV extends Comparable<VV>>
> extends GatherFunction<K, VV, VV> {
> @Override
> public void updateVertex(Vertex<K, VV> vertex,
> MessageIterator<VV> messages) throws Exception {
> VV current = vertex.getValue();
> VV min = current;
> for (VV msg : messages) {
> if (msg.compareTo(min) < 0) {
> min = msg;
> }
> }
> if (!min.equals(current)) {
> setNewVertexValue(min);
> }
> }
> }
> {code}
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