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https://issues.apache.org/jira/browse/SOLR-16689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17699698#comment-17699698
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ASF subversion and git services commented on SOLR-16689:
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Commit fa72d986a7e713c0d280f9c2c9ed6e636177604c in solr's branch
refs/heads/branch_9x from Justin Sweeney
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=fa72d986a7e ]
SOLR-16689: Improving efficiency of replication process (#1442)
Improving efficiency of replication process by avoiding repeated attempts to
replicate empty index and avoiding commit call to leader when replicating to a
non-leader replica
> Inefficiencies in replication process
> -------------------------------------
>
> Key: SOLR-16689
> URL: https://issues.apache.org/jira/browse/SOLR-16689
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 9.1.1
> Reporter: Justin Sweeney
> Assignee: Justin Sweeney
> Priority: Major
>
> There are a couple of inefficiencies with replication that can cause
> increased CPU usage unnecessarily due to replicas being added:
> # The
> [RecoveryStrategy.replicate()|https://github.com/apache/solr/blob/main/solr/core/src/java/org/apache/solr/cloud/RecoveryStrategy.java#L219]
> method makes a call to commit to on the leader. This happens whenever a
> replica is reloaded. For PULL replicas in particular this isn't necessary
> since we can just pull down whatever the latest data is and rely on other
> mechanisms to be consistently committing the leader. (As an aside, it seems
> like forcing a commit on the leader might never be necessary, but for this
> I've limited it to focusing on PULL replicas).
> # In a case where the leader has no data yet (index version is 0), then a
> non-leader replica will consistently delete and recreate its core due to this
> case in IndexFetcher:
> [https://github.com/apache/solr/blob/main/solr/core/src/java/org/apache/solr/handler/IndexFetcher.java#L549.]
> This can cause unnecessary CPU usage until the leader has data indexed to it.
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