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https://issues.apache.org/jira/browse/FLINK-1502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15158023#comment-15158023
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Dongwon Kim commented on FLINK-1502:
------------------------------------
Let's consider the following scenario:
| Node1 (N1) | N2 | N3
--------------------------------------
Session1 | TM1 | TM2 | TM3
Session2 | TM2 | TM3 | TM1
Session3 | TM3 | TM2 | TM1
After Session1 is finished, Node1 have the following metrics:
- cluster.MyCluster.taskmanager.1.gc_time
After Session2 is finished, Node1 have the following metrics:
- cluster.MyCluster.taskmanager.1.gc_time
- cluster.MyCluster.taskmanager.2.gc_time
After Session3 is finished, Node1 have the following metrics:
- cluster.MyCluster.taskmanager.1.gc_time
- cluster.MyCluster.taskmanager.2.gc_time
- cluster.MyCluster.taskmanager.3.gc_time
Around this time, a user should check which metric is the one for the current
session among the above three metrics.
The problem is getting worse if the user has to launch much more TaskManagers.
For example, 500 TaskManagers over multiple sessions will end up with 500
metrics for each host.
Wouldn't be better to assign indexes to TaskManagers scoped to each host?
p.s.
I'm going to start without considering multiple TaskManagers on the same node
as we haven't yet reached a consensus.
But I think we still need to develop this discussion further.
> Expose metrics to graphite, ganglia and JMX.
> --------------------------------------------
>
> Key: FLINK-1502
> URL: https://issues.apache.org/jira/browse/FLINK-1502
> Project: Flink
> Issue Type: Sub-task
> Components: JobManager, TaskManager
> Affects Versions: 0.9
> Reporter: Robert Metzger
> Assignee: Dongwon Kim
> Priority: Minor
> Fix For: pre-apache
>
>
> The metrics library allows to expose collected metrics easily to other
> systems such as graphite, ganglia or Java's JVM (VisualVM).
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