Wei-Chiu Chuang created HDDS-13112:
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Summary: [Docs] OM Bootstrap can also happen when follower falls
behind too much
Key: HDDS-13112
URL: https://issues.apache.org/jira/browse/HDDS-13112
Project: Apache Ozone
Issue Type: Improvement
Components: documentation, OM HA
Affects Versions: 2.1.0
Reporter: Wei-Chiu Chuang
[https://ozone.apache.org/docs/edge/feature/om-ha.html]
It is written in the user doc that OM bootstrap happens when adding a new OM.
Ratis would trigger notifyInstallSnapshotFromLeader() if a follower OM falls
behind the leader OM. We should update the doc to include this condition too.
[https://github.com/apache/ratis/blob/c1da37cb455bbf94da267b3f2b9bf3884017e1ca/ratis-server-api/src/main/java/org/apache/ratis/server/leader/LogAppender.java#L109]
{code:java}
/**
* Should this {@link LogAppender} send a snapshot to the follower?
*
* @return the snapshot if it should install a snapshot; otherwise, return null.
*/
default SnapshotInfo shouldInstallSnapshot() {
// we should install snapshot if the follower needs to catch up and:
// 1. there is no local log entry but there is snapshot
// 2. or the follower's next index is smaller than the log start index
// 3. or the follower is bootstrapping and has not installed any snapshot yet
{code}
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