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https://issues.apache.org/jira/browse/SOLR-8744?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Noble Paul reassigned SOLR-8744:
--------------------------------
Assignee: Noble Paul
> SplitShard needs finer-grained mutual exclusion
> -----------------------------------------------
>
> Key: SOLR-8744
> URL: https://issues.apache.org/jira/browse/SOLR-8744
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Affects Versions: 5.4.1
> Reporter: Scott Blum
> Assignee: Noble Paul
> Labels: sharding, solrcloud
>
> SplitShard creates a mutex over the whole collection, but in practice this is
> a big scaling problem. Multiple split shard operations could happen at the
> time time, as long as different shards are being split. In practice, those
> shards often reside on different machines, so there's no I/O bottleneck in
> those cases, just the mutex in Overseer forcing the operations to be done
> serially.
> Given that a single split can take many minutes on a large collection, this
> is a bottleneck at scale.
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