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https://issues.apache.org/jira/browse/HDDS-12169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18057434#comment-18057434
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Wei-Chiu Chuang commented on HDDS-12169:
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[~rnblough] here we said rack scatter policy is for EC containers only
https://ozone-site-v2.staged.apache.org/docs/administrator-guide/configuration/performance/topology#ec-containers
should we update this description? Sounds like rack scatter policy can support
Ratis containers too.
> Add a RackScatter container placement policy for RATIS
> ------------------------------------------------------
>
> Key: HDDS-12169
> URL: https://issues.apache.org/jira/browse/HDDS-12169
> Project: Apache Ozone
> Issue Type: New Feature
> Affects Versions: 1.4.0
> Reporter: Ryan Blough
> Assignee: Ryan Blough
> Priority: Minor
>
> I observed a scenario where a commercial Ozone user had rack awareness
> configured, using standard RATIS 3 containers, and they experienced data loss
> due to a series of unfortunate events.
> The key bad event for them is that their hardware was managed by a vendor,
> who shut down one of their racks for maintenance by surprise. This took 2 out
> of 3 replicas down for long enough to trigger replication, and in multiple
> cases the remaining containers had been impacted by the opened-twice because
> of volume failure problem, resulting ultimately in data loss.
> It seems like this problem would have been averted if the loss of a single
> rack didn't make a majority of replicas unavailable.
> I believe the solution is to provide a container placement policy for RATIS
> like the RackScatter policy for EC.
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