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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6413) Decouple Yarn Registry API from ZK
Date Tue, 25 Jul 2017 00:57:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16099345#comment-16099345

Jian He commented on YARN-6413:

bq. I did not remove any methods, I just didn't add the ones that exist in yarn-native-services
but not trunk. I thought doing so would probably cause more conflicts than not.
looks like RegistryUtils#extractServiceRecords is removed.  Do you mind change RegistryDNSServer
to use the new methods ? (i.e. make this patch compile with yarn-native-services branch)

bq. My understanding was that DNS went through ZK directly without going through the interface,
so it wouldn't be affected by the service records setting up the path differently. I can change
the path construction back for the ZK impl if it needs that.
The DNS  today depends on the ZK path layout to reconstruct the service record. So changing
the zk path will break DNS.

> Decouple Yarn Registry API from ZK
> ----------------------------------
>                 Key: YARN-6413
>                 URL: https://issues.apache.org/jira/browse/YARN-6413
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: amrmproxy, api, resourcemanager
>            Reporter: Ellen Hui
>            Assignee: Ellen Hui
>         Attachments: 0001-Registry-API-v2.patch, 0002-Registry-API-v2.patch
> Right now the Yarn Registry API (defined in the RegistryOperations interface) is a very
thin layer over Zookeeper. This jira proposes changing the interface to abstract away the
implementation details so that we can write a FS-based implementation of the registry service,
which will be used to support AMRMProxy HA.
> The new interface will use register/delete/resolve APIs instead of Zookeeper-specific
operations like mknode. 

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