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https://issues.apache.org/jira/browse/YARN-1029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13851965#comment-13851965
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Karthik Kambatla commented on YARN-1029:
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[~bikassaha] - thanks for the inputs. Want to make sure I understand your
proposal right.
bq. IMO, to make this really easy to use, we should be offering zk-store and
embedded leader election as a package.
We should probably discuss the specifics here. Does this mean we have a single
config to turn on both zk-store and embedded leader election. Do the rest of
the configs - ZK ACLs etc. continue to exist. If we unify the zk configs, what
advantages does the package approach offer in addition to the user not having
to explicitly enable embedded-leader-election and dummy-fencing?
If the proposal is to reduce the configuration steps for the embedded leader
election, I am onboard to unify the zk configs and set the leader-election
configs automatically when using ZK store.
I also spoke to Vinod offline about this JIRA. The approach (patch) should do
the following:
# When automatic failover is enabled, one of the RMs should automatically
assume the Active mode.
# When the Active RM goes down, the other RM should take over the Active role.
# Admins should be able to gracefully failover from one RM to the other.
# During failovers, only a single RM should be able to access the store.
Point 4 is taken care of by the ZKRMStateStore. Point 1, 2 and 3 are
implemented in the patch posted here, graceful failover comes from implementing
ZKFCProtocol.
> Allow embedding leader election into the RM
> -------------------------------------------
>
> Key: YARN-1029
> URL: https://issues.apache.org/jira/browse/YARN-1029
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Bikas Saha
> Assignee: Karthik Kambatla
> Attachments: embedded-zkfc-approach.patch, yarn-1029-0.patch,
> yarn-1029-0.patch, yarn-1029-approach.patch
>
>
> It should be possible to embed common ActiveStandyElector into the RM such
> that ZooKeeper based leader election and notification is in-built. In
> conjunction with a ZK state store, this configuration will be a simple
> deployment option.
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