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Posted to issues@ozone.apache.org by "Ivan Andika (Jira)" <ji...@apache.org> on 2025/07/07 01:13:00 UTC
[jira] [Resolved] (HDDS-13268) [Docs] Advanced topics: troubleshooting OM snapshot installation
[ https://issues.apache.org/jira/browse/HDDS-13268?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ivan Andika resolved HDDS-13268.
--------------------------------
Resolution: Implemented
> [Docs] Advanced topics: troubleshooting OM snapshot installation
> ----------------------------------------------------------------
>
> Key: HDDS-13268
> URL: https://issues.apache.org/jira/browse/HDDS-13268
> Project: Apache Ozone
> Issue Type: Task
> Components: OM HA, Ozone Manager
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Priority: Major
> Labels: pull-request-available
>
> [https://github.com/apache/ozone/pull/8600#pullrequestreview-2925327285]
> Create a new user doc page for "Troubleshooting OM HA snapshot installation issues"
> {quote}I think it is worth adding how to handle an issue that we encountered before that because of the a huge OM DB, while the follower's install the snapshot from leader (i.e. download the OM DB), the leader's Raft log for the particular snapshot index has already been purged. So after the OM follower finished downloading the OM DB, the leader cannot send the purged logs and request to follower to redownload the OM DB.
> Currently, this can be handled by setting the configurations introduced in HDDS-8131. So either:
> # Set {{ozone.om.ratis.log.purge.preservation.log.num}} to a high enough value (e.g. 1000000) so that the OM leader will not the purge the last N logs.
> # Set {{ozone.om.ratis.log.purge.upto.snapshot.index}} to false, which causes OM leader logs to never be purged until all the follower already catch up.
> You can refer to the ticket for a full explanation and tradeoffs.
> {quote}
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