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https://issues.apache.org/jira/browse/FLINK-4167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15365965#comment-15365965
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ASF GitHub Bot commented on FLINK-4167:
---------------------------------------
Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2210
The problem was that the `currentLowWatermark` gauges weren't deregistered
after the job terminated. This metric is registered by the
`StreamInputProcessor` directly on the `IOMetricGroup` but never deregistered,
because the `ioMetrics` group is never closed by the `TaskMetricGroup`.
I guess that the problem is then that the `StreamInputProcessor` shouldn't
register the `currentLowWatermark` metric. Instead, the IOMetricGroup should
preregister the corresponding metric?
> TaskMetricGroup does not close IOMetricGroup
> --------------------------------------------
>
> Key: FLINK-4167
> URL: https://issues.apache.org/jira/browse/FLINK-4167
> Project: Flink
> Issue Type: Bug
> Components: Metrics
> Affects Versions: 1.1.0
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
> Fix For: 1.1.0
>
>
> The {{TaskMetricGroup}} does not close the {{ioMetrics}} metric group. This
> causes that metrics registered under the {{ioMetrics}} are not deregistered
> after the termination of a job.
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