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https://issues.apache.org/jira/browse/KUDU-1807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adar Dembo reassigned KUDU-1807:
--------------------------------
Assignee: Adar Dembo
> GetTableSchema() is O(n) in the number of tablets
> -------------------------------------------------
>
> Key: KUDU-1807
> URL: https://issues.apache.org/jira/browse/KUDU-1807
> Project: Kudu
> Issue Type: Sub-task
> Components: master, perf
> Affects Versions: 1.2.0
> Reporter: Todd Lipcon
> Assignee: Adar Dembo
> Priority: Critical
> Labels: data-scalability
>
> GetTableSchema calls TableInfo::IsCreateTableDone. This method checks each
> tablet for whether it is in the correct state, which requires acquiring the
> RWC lock for every tablet. This is somewhat slow for large tables with
> thousands of tablets, and this is actually a relatively hot path because
> every task in an Impala query ends up calling GetTableSchema() when it opens
> its scanner.
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