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https://issues.apache.org/jira/browse/IMPALA-11457?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Smith resolved IMPALA-11457.
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Fix Version/s: Impala 4.2.0
Resolution: Fixed
> Ozone parallelism reduced when backends are co-located
> ------------------------------------------------------
>
> Key: IMPALA-11457
> URL: https://issues.apache.org/jira/browse/IMPALA-11457
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 4.1.0
> Reporter: Michael Smith
> Assignee: Michael Smith
> Priority: Critical
> Fix For: Impala 4.2.0
>
>
> When Impala and Ozone backends are co-located (at the same IP address),
> access to Ozone will use a local filesystem access path. It's supposed to
> assign each backend a separate disk ID so access happens in parallel, but a
> bug in assigning queues when storage ID is unknown results in all Ozone
> backends sharing the same queue. This results in reduced parallelism as the
> queue uses a single I/O thread.
> To make Impala see Ozone as co-located in a dev environment, start Impala
> with {{--hostname=localhost}} (which is already the default for Ozone).
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