Michael Smith created IMPALA-11457:
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Summary: 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
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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