Vrushali C created YARN-5357:
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Summary: Timeline service v2 integration with Federation
Key: YARN-5357
URL: https://issues.apache.org/jira/browse/YARN-5357
Project: Hadoop YARN
Issue Type: Sub-task
Components: timelineserver
Reporter: Vrushali C
Jira to note the discussion points from an initial chat about integrating
Timeline Service v2 with Federation (YARN-2915).
cc [~subru] [~curino]
For Federation:
- all entities that belong to the same flow run should have the same cluster
name
- app id in the same flow run strongly ordered in time
- need a logical cluster name and physical cluster name
- a possibility to implement the Application TimelineCollector as an
interceptor in the AMRMProxyService.
For Timeline Service:
- need to store physical cluster id and logical cluster id so that we don't
lose information at any level (flow/app/entity etc)
- add a new table app id to cluster mapping table
- need a different entity table/some table to store node level metrics for
physical cluster stats. Once we get to node-level rollup, we probably have to
store something in a dc, cluster, rack, node hierarchy. In that case a physical
cluster makes sense, but we'd still need some way to tie physical and logical
together in order to make automatic error detection etc that we're envisioning
feasible within a federated setup.
For the Cluster Naming convention:
- three situations for cluster name:
----> app submitted to router should take federated (aka logical) cluster name
----> app submitted directly to RM should take physical cluster name
----> Info about the physical cluster in entities?
- suggestion to set the cluster name as yarn tag at the router level (in the
app submission context)
Other points to note:
- for federation to work smoothly in environments that use HDFS some additional
considerations are needed, and possibly some solution like what is being used
at Twitter with the nFly approach.
Email thread context:
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---------- Forwarded message ----------
From: Joep Rottinghuis <[email protected]>
Date: Fri, Jul 8, 2016 at 1:22 PM
Subject: Re: Federation -Timeline Service meeting notes
To: Subramaniam Venkatraman Krishnan <[email protected]>
Cc: Sangjin Lee <[email protected]>, Vrushali Channapattan
<[email protected]>, Carlo Curino <[email protected]>, Carlo Curino
<[email protected]>, "[email protected]" <[email protected]>
Thanks for the notes.
I think that for federation to work smoothly in environments that use HDFS some
additional considerations are needed, and possibly some solution like what
we're using at Twitter with our nFly approach.
bq. - need a different entity table/some table to store node level metrics for
physical cluster stats
Once we get to node-level rollup, we probably have to store something in a dc,
cluster, rack, node hierarchy. In that case a physical cluster makes sense, but
we'd still need some way to tie physical and logical together in order to make
automatic error detection etc that we're envisioning feasible within a
federated setup.
Cheers,
Joep
On Fri, Jul 8, 2016 at 1:00 PM, Subramaniam Venkatraman Krishnan
<[email protected]> wrote:
Thanks Vrushali for crisply capturing the essential from our rambling
discussion J.
Sangjin, I just want to add one comment to yours – we want to retain the
physical cluster name (possibly as a new entity type) so that we don’t lose
information & we can cluster level rollups even if they are not efficient.
Additionally, based on the walkthrough of Federation design:
· There was general agreement with the proposed approach.
· There is a possibility to implement the Application
TimelineCollector as an interceptor in the AMRMProxyService.
· Joep raised the concern that it would be better if the RMs obtain
the epoch from FederationStateStore. This is not currently in the roadmap of
our MVP but we definitely plan to address this in future.
Regards,
Subru
From: Sangjin Lee [mailto:[email protected]]
Sent: Thursday, July 07, 2016 6:22 PM
To: Vrushali Channapattan <[email protected]>
Cc: Joep Rottinghuis <[email protected]>; Carlo Curino
<[email protected]>; Carlo Curino <[email protected]>; Subramaniam
Venkatraman Krishnan <[email protected]>; [email protected]
Subject: Re: Federation -Timeline Service meeting notes
Thanks for the summary Vrushali!
Just so that we're on the same page regarding the terminology, I understand
we're using the terms "logical cluster" and "federated cluster" interchangeably.
Also, between using the federated cluster name and the home cluster name as
a solution, I think we were leaning towards the federated cluster name
(although not concluded).
On Thu, Jul 7, 2016 at 4:33 PM, Vrushali Channapattan
<[email protected]> wrote:
For Federation:
- all entities that belong to the same flow run should have the same
cluster name
- app id in the same flow run strongly ordered in time
- need a logical cluster name and physical cluster name
For Timeline Service:
- need to store physical cluster id and logical cluster id so that we
don't lose information at any level (flow/app/entity etc)
- add a new table app id to cluster mapping table
- need a different entity table/some table to store node level metrics
for physical cluster stats
For the Cluster Naming convention:
- three situations for cluster name:
----> app submitted to router should take federated cluster name
----> app submitted directly to RM should take physical cluster name
----> Info about the physical cluster in entities?
- suggestion to set the cluster name as yarn tag at the router level
(in the app submission context)
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