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https://issues.apache.org/jira/browse/SPARK-27780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun updated SPARK-27780:
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Target Version/s: (was: 3.2.0)
> 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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