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https://issues.apache.org/jira/browse/SENTRY-1874?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexander Kolbasov updated SENTRY-1874:
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Status: Patch Available (was: Open)
> Do not require quiet HMS when taking initial HMS snapshot
> ---------------------------------------------------------
>
> Key: SENTRY-1874
> URL: https://issues.apache.org/jira/browse/SENTRY-1874
> Project: Sentry
> Issue Type: Bug
> Components: Sentry
> Affects Versions: 2.0.0
> Reporter: Alexander Kolbasov
> Assignee: Alexander Kolbasov
> Labels: sentry-ha
> Fix For: 2.0.0
>
> Attachments: SENTRY-1874.02.patch
>
>
> When Sentry starts initially, it needs to get a full snapshot from HMS and
> associate it with a specific notification ID. HMS does not provide any
> mechanism to get a consistent snapshot with known notification ID. SO Sentry
> does the following:
> 1) Read current notification ID_0
> 2) Obtain full snapshot from HMS
> 3) Read current notification ID_1
> 4) If (ID_0 != ID_1) goto 1.
> This creates a problem that the process may never converge when there is some
> constant stream of HMS activity affecting notification IDs. We would like to
> be able to use a problem that can converge in the presence of updates.
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