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https://issues.apache.org/jira/browse/HUDI-2475?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinoth Chandar updated HUDI-2475:
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Summary: Rolling Upgrade downgrade story for 0.10 & enabling metadata
(was: Upgrade downgrade infra for enabling metadata)
> Rolling Upgrade downgrade story for 0.10 & enabling metadata
> ------------------------------------------------------------
>
> Key: HUDI-2475
> URL: https://issues.apache.org/jira/browse/HUDI-2475
> Project: Apache Hudi
> Issue Type: Sub-task
> Reporter: sivabalan narayanan
> Assignee: Vinoth Chandar
> Priority: Blocker
> Fix For: 0.10.0
>
>
> Upgrade downgrade infra for enabling metadata.
>
> If user is having a writer process and clustering/compaction running async.
>
> - New synchronous metadata design, has a constraint that once metadata table
> is bootstrapped, all commits will happen synchronously. In other words, there
> is no catch up business wrt datatable.
> So, it may not be feasible to do rolling upgrade (i.e. upgrade writer first
> while async compaction is running) and then upgrade async compaction.
> Bootstrap has to be done by stopping all processes and then we can restart
> all other processes one by one (by using the upgraded hudi library) w/
> metadata enabled.
> This is the only viable option I can think of.
> 1. Stop all processes. Upgrade to hudi to a version w/ synchronous metadata.
> bring up one writer process w/ metadata config enabled. this will bootstrap
> the metadata table. and from there on, any new commits by the writer will do
> synchronous updates to metadata.
> Note: users can choose to upgrade via hudi-cli if need be. but easier would
> be to just start the writer. Expect some delay for first commit since
> bootstrap will be happening.
> 2. Once first commit in previous writer process completes successfully, we
> can restart all other processes. Upgrade the async table service (to hudi
> version w/ metadata enabled) and restart it. *Ensure metadata table is
> enabled across all processes.* Even if missed on one, could result in data
> loss.
>
> By this, once metadata table is bootstrapped, any new commits from all
> processes will be synced to metadata.
>
>
>
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