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https://issues.apache.org/jira/browse/YARN-6736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16328653#comment-16328653
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Rohith Sharma K S commented on YARN-6736:
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Thanks [~vrushalic] for post review.. Since there were no reply from anyone I
went ahead with committing this patch. We can created follow up JIRA if any
issues has been observed from this patch.
bq. In ApplicationMaster # init, the patch removes the setting of
timelineServiceV1Enabled at line 638 but uses it at line 709. Since it is not
set, this will not invoke publishApplicationAttemptEvent I think? Similarly for
timelineServiceV2Enabled at lines 701.
Before publishing, *startTimelineClient(conf);* is being called which
initializes these variables at line no. 700 which is not present in this patch.
You can see startTimelineClient(conf) method change in patch.
bq. Perhaps a good idea to catch this and ignore and proceed.
IIUC, if wrong configuration value has been set then we need to inform admin
immediately. So I thought let it through exception and fail the service start
up.
bq. why the conf settings for timeline server address & port had to be moved
out of synchronized in MiniYARNCluster were in this patch?
Configuration is global settings which same config is being passed to
ApplicationHistoryServerWrapper service. Doing this, all the services gets same
values. I believe this should not cause any impact. Btw, I guess it changed
because of test failure after this patch change which I see from history of
patches.
> Consider writing to both ats v1 & v2 from RM for smoother upgrades
> ------------------------------------------------------------------
>
> Key: YARN-6736
> URL: https://issues.apache.org/jira/browse/YARN-6736
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: timelineserver
> Reporter: Vrushali C
> Assignee: Aaron Gresch
> Priority: Major
> Fix For: 3.1.0, 2.10.0, 3.0.1, yarn-7055
>
> Attachments: YARN-6736-YARN-5355.001.patch,
> YARN-6736-YARN-5355.002.patch, YARN-6736-YARN-5355.003.patch,
> YARN-6736-YARN-5355.004.patch, YARN-6736-YARN-5355.005.patch,
> YARN-6736.001.patch, YARN-6736.002.patch
>
>
> When the cluster is being upgraded from atsv1 to v2, it may be good to have a
> brief time period during which RM writes to both atsv1 and v2. This will help
> frameworks like Tez migrate more smoothly.
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