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Date: Sat, 10 Dec 2016 01:06:58 +0000 (UTC)
From: "Jian He (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.13009665.1475609585000.488914.1481332018746@Atlassian.JIRA>
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Subject: [jira] [Commented] (YARN-5709) Cleanup leader election configs and
 pluggability
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archived-at: Sat, 10 Dec 2016 01:07:00 -0000


    [ https://issues.apache.org/jira/browse/YARN-5709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15736886#comment-15736886 ] 

Jian He commented on YARN-5709:
-------------------------------

branch-2, and trunk is committed.

Unfortunately, there seems quite some conflicts with branch-2.8, it's probably missing jiras like YARN-5677.
[~kasha], should we backport them ?

> Cleanup leader election configs and pluggability
> ------------------------------------------------
>
>                 Key: YARN-5709
>                 URL: https://issues.apache.org/jira/browse/YARN-5709
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 2.8.0
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>            Priority: Blocker
>         Attachments: yarn-5709-wip.2.patch, yarn-5709.1.patch, yarn-5709.2.patch, yarn-5709.3.patch, yarn-5709.4.patch
>
>
> While reviewing YARN-5677 and YARN-5694, I noticed we could make the curator-based election code cleaner. It is nicer to get this fixed in 2.8 before we ship it, but this can be done at a later time as well. 
> # By EmbeddedElector, we meant it was running as part of the RM daemon. Since the Curator-based elector is also running embedded, I feel the code should be checking for {{!curatorBased}} instead of {{isEmbeddedElector}}
> # {{LeaderElectorService}} should probably be named {{CuratorBasedEmbeddedElectorService}} or some such.
> # The code that initializes the elector should be at the same place irrespective of whether it is curator-based or not. 
> # We seem to be caching the CuratorFramework instance in RM. It makes more sense for it to be in RMContext. If others are okay with it, we might even be better of having {{RMContext#getCurator()}} method to lazily create the curator framework and then cache it. 


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