Wei-Chiu Chuang created HDDS-13268:
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Summary: [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
[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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