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https://issues.apache.org/jira/browse/SOLR-16438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17696104#comment-17696104
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ASF subversion and git services commented on SOLR-16438:
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Commit cf822cf5f8081efa3b7f53822be7828967012680 in solr's branch
refs/heads/main from Bruno Roustant
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=cf822cf5f80 ]
Revert "SOLR-16438: Support optional split.setPreferredLeaders prop in shard
split command."
This reverts commit fae42ec0cf43f288c909cb2e12b4d68e6a409d33.
This reverts commit 57e73e4f9066712a16b0885b0db2482ec106bfb9.
This reverts commit 0051ecf1f81927cfb1f6c54935a19ea521b616ba.
> Shard split should be able to set preferred leaders on other replicas
> ---------------------------------------------------------------------
>
> Key: SOLR-16438
> URL: https://issues.apache.org/jira/browse/SOLR-16438
> Project: Solr
> Issue Type: Improvement
> Reporter: Bruno Roustant
> Assignee: Bruno Roustant
> Priority: Major
> Fix For: 9.2
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> Currently, shard split always create a first replica for each sub-shard on
> the current host. Then it creates other replicas and their corresponding
> sub-shards are in RECOVERY state. The effect is that the first replica (on
> the current host) is always the leader, meaning that if the sub-shards are
> split themselves, their sub-sub-shards leaders are also on the same host.
> This can lead to very unbalanced situation where the same host is the leader
> for a whole set of shards.
> A solution to distribute evenly the leaders is to flag some other replicas
> with the preferredLeader property during the split. Then a rebalance-leaders
> command can elect the appropriate leaders. If we do that for each split, then
> all the sub-shards have their leaders correctly balanced.
> To go further, we can improve CollectionsHandler#CollectionOperation to
> support combined operations. That way a CollectionOperation#SPLITSHARD_OP can
> trigger a split op, then a wait for split completion op, and then a rebalance
> leaders op.
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