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https://issues.apache.org/jira/browse/FLINK-3427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15875998#comment-15875998
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ASF GitHub Bot commented on FLINK-3427:
---------------------------------------
Github user uce commented on a diff in the pull request:
https://github.com/apache/flink/pull/3366#discussion_r102174155
--- Diff:
flink-runtime-web/web-dashboard/app/partials/jobs/job.plan.node.watermarks.jade
---
@@ -0,0 +1,27 @@
+//
+ Licensed to the Apache Software Foundation (ASF) under one
+ or more contributor license agreements. See the NOTICE file
+ distributed with this work for additional information
+ regarding copyright ownership. The ASF licenses this file
+ to you under the Apache License, Version 2.0 (the
+ "License"); you may not use this file except in compliance
+ with the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
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+ See the License for the specific language governing permissions and
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+
+table.table.table-hover.table-clickable.table-activable.table-inner(ng-if="(watermarks
| watermarksByNode:nodeid).length")
--- End diff --
If I click on a node that has `None` as the low watermark (I think when no
metric is exposed for the node) the sub task list still expands and is
clickable. You get a grew background, but don't see anything:
> Add watermark monitoring to JobManager web frontend
> ---------------------------------------------------
>
> Key: FLINK-3427
> URL: https://issues.apache.org/jira/browse/FLINK-3427
> Project: Flink
> Issue Type: Improvement
> Components: Streaming, Webfrontend
> Reporter: Robert Metzger
>
> Currently, its quite hard to figure out issues with the watermarks.
> I think we can improve the situation by reporting the following information
> through the metrics system:
> - Report the current low watermark for each operator (this way, you can see
> if one operator is preventing the watermarks to rise)
> - Report the number of events arrived after the low watermark (users can see
> how accurate the watermarks are)
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