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From "Jason Moore (Jira)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-27780) Shuffle server & client should be versioned to enable smoother upgrade
Date Wed, 01 Jul 2020 03:47:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-27780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17149083#comment-17149083
] 

Jason Moore commented on SPARK-27780:
-------------------------------------

I encounter this on 3.0.0 running with a much older shuffle service (I think like 2.1.1).
 Is there any documentation on which shuffle services 3.0.0 will work with?

> Shuffle server & client should be versioned to enable smoother upgrade
> ----------------------------------------------------------------------
>
>                 Key: SPARK-27780
>                 URL: https://issues.apache.org/jira/browse/SPARK-27780
>             Project: Spark
>          Issue Type: New Feature
>          Components: Shuffle, Spark Core
>    Affects Versions: 3.1.0
>            Reporter: Imran Rashid
>            Priority: Major
>
> The external shuffle service is often upgraded at a different time than spark itself.
 However, this causes problems when the protocol changes between the shuffle service and the
spark runtime -- this forces users to upgrade everything simultaneously.
> We should add versioning to the shuffle client & server, so they know what messages
the other will support.  This would allow better handling of mixed versions, from better error
msgs to allowing some mismatched versions (with reduced capabilities).
> This originally came up in a discussion here: https://github.com/apache/spark/pull/24565#issuecomment-493496466
> There are a few ways we could do the versioning which we still need to discuss:
> 1) Version specified by config.  This allows for mixed versions across the cluster and
rolling upgrades.  It also will let a spark 3.0 client talk to a 2.4 shuffle service.  But,
may be a nuisance for users to get this right.
> 2) Auto-detection during registration with local shuffle service.  This makes the versioning
easy for the end user, and can even handle a 2.4 shuffle service though it does not support
the new versioning.  However, it will not handle a rolling upgrade correctly -- if the local
shuffle service has been upgraded, but other nodes in the cluster have not, it will get the
version wrong.
> 3) Exchange versions per-connection.  When a connection is opened, the server & client
could first exchange messages with their versions, so they know how to continue communication
after that.



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