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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4812) Report Watermark metrics in all operators
Date Wed, 29 Nov 2017 10:36:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16270562#comment-16270562

ASF GitHub Bot commented on FLINK-4812:

Github user zentol commented on a diff in the pull request:

    --- Diff: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/StreamSourceContexts.java
    @@ -313,6 +325,7 @@ protected void processAndCollectWithTimestamp(T element, long timestamp)
     		protected void processAndEmitWatermark(Watermark mark) {
    +			watermarkGauge.setCurrentLowWatermark(mark.getTimestamp());
    --- End diff --
    I've thought about doing that, but when i noticed that it wouldn't work for the `AutomaticWatermarkContext`
which emits watermarks in `processAndCollect`, and that contexts may emit watermarks anywhere
(meaning we couldn't reliably cover all cases in the base class) i figured that we may just
let each context do it separately.

> Report Watermark metrics in all operators
> -----------------------------------------
>                 Key: FLINK-4812
>                 URL: https://issues.apache.org/jira/browse/FLINK-4812
>             Project: Flink
>          Issue Type: Improvement
>          Components: Metrics
>            Reporter: Robert Metzger
>            Assignee: Chesnay Schepler
>            Priority: Critical
>             Fix For: 1.5.0
> As reported by a user, Flink does currently not export the current low watermark for
sources (http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/currentLowWatermark-metric-not-reported-for-all-tasks-td13770.html).
> This JIRA is for adding such a metric for the sources as well.

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