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https://issues.apache.org/jira/browse/FLINK-27944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17641916#comment-17641916
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Piotr Nowojski commented on FLINK-27944:
----------------------------------------
merged to master as 20808fd^ and 20808fd
merged to release 1.16 as c589cd5f7c8^ and c589cd5f7c8
[~Weijie Guo], could you prepare a backport to release-1.15 branch? I've
backported your changes to release-1.16 already, but while doing that for
release-1.15 I stumbled across some conflicts.
> IO metrics collision happens if a task has union inputs
> -------------------------------------------------------
>
> Key: FLINK-27944
> URL: https://issues.apache.org/jira/browse/FLINK-27944
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Metrics
> Affects Versions: 1.15.0
> Reporter: Zhu Zhu
> Assignee: Weijie Guo
> Priority: Major
> Labels: pull-request-available, stale-assigned
> Fix For: 1.17.0, 1.16.1, 1.15.4
>
>
> When a task has union inputs, some IO metrics(numBytesIn* and numBuffersIn*)
> of the different inputs may collide and failed to be registered.
>
> The problem can be reproduced with a simple job like:
> {code:java}
> DataStream<String> source1 = env.fromElements("abc");
> DataStream<String> source2 = env.fromElements("123");
> source1.union(source2).print();{code}
>
> Logs of collisions:
> {code:java}
> 2022-06-08 00:59:01,629 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBytesInLocal'. Metric will not be reported.[, taskmanager,
> fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to Std. Out, 0,
> Shuffle, Netty, Input]
> 2022-06-08 00:59:01,629 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBytesInLocalPerSecond'. Metric will not be reported.[, taskmanager,
> fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to Std. Out, 0,
> Shuffle, Netty, Input]
> 2022-06-08 00:59:01,629 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBytesInLocal'. Metric will not be reported.[, taskmanager,
> fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to Std. Out, 0]
> 2022-06-08 00:59:01,629 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBytesInLocalPerSecond'. Metric will not be reported.[, taskmanager,
> fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to Std. Out, 0]
> 2022-06-08 00:59:01,630 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBytesInRemote'. Metric will not be reported.[, taskmanager,
> fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to Std. Out, 0,
> Shuffle, Netty, Input]
> 2022-06-08 00:59:01,630 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBytesInRemotePerSecond'. Metric will not be reported.[, taskmanager,
> fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to Std. Out, 0,
> Shuffle, Netty, Input]
> 2022-06-08 00:59:01,630 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBytesInRemote'. Metric will not be reported.[, taskmanager,
> fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to Std. Out, 0]
> 2022-06-08 00:59:01,630 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBytesInRemotePerSecond'. Metric will not be reported.[, taskmanager,
> fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to Std. Out, 0]
> 2022-06-08 00:59:01,630 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBuffersInLocal'. Metric will not be reported.[, taskmanager,
> fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to Std. Out, 0,
> Shuffle, Netty, Input]
> 2022-06-08 00:59:01,630 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBuffersInLocalPerSecond'. Metric will not be reported.[,
> taskmanager, fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to
> Std. Out, 0, Shuffle, Netty, Input]
> 2022-06-08 00:59:01,630 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBuffersInLocal'. Metric will not be reported.[, taskmanager,
> fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to Std. Out, 0]
> 2022-06-08 00:59:01,630 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBuffersInLocalPerSecond'. Metric will not be reported.[,
> taskmanager, fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to
> Std. Out, 0]
> 2022-06-08 00:59:01,630 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBuffersInRemote'. Metric will not be reported.[, taskmanager,
> fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to Std. Out, 0,
> Shuffle, Netty, Input]
> 2022-06-08 00:59:01,630 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBuffersInRemotePerSecond'. Metric will not be reported.[,
> taskmanager, fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to
> Std. Out, 0, Shuffle, Netty, Input]
> 2022-06-08 00:59:01,630 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBuffersInRemote'. Metric will not be reported.[, taskmanager,
> fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to Std. Out, 0]
> 2022-06-08 00:59:01,630 WARN org.apache.flink.metrics.MetricGroup
> [] - Name collision: Group already contains a Metric with the
> name 'numBuffersInRemotePerSecond'. Metric will not be reported.[,
> taskmanager, fa9f270e-e904-4f69-8227-8d6e26e1be62, WordCount, Sink: Print to
> Std. Out, 0]
> {code}
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