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https://issues.apache.org/jira/browse/IMPALA-7359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on IMPALA-7359 stopped by Csaba Ringhofer.
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> Make local timezone deterministic during tests
> ----------------------------------------------
>
> Key: IMPALA-7359
> URL: https://issues.apache.org/jira/browse/IMPALA-7359
> Project: IMPALA
> Issue Type: Improvement
> Components: Infrastructure
> Reporter: Csaba Ringhofer
> Assignee: Csaba Ringhofer
> Priority: Major
>
> Currently Impala uses the timezone of the machine where impalad runs for
> local<-> utc time conversions. This makes it hard to test these functions, as
> they give different results depending on the location. Some tests solve this
> by starting a custom cluster after setting env var TZ, while others do not
> check the results precisely (only check that local!=utc, which is not true in
> some region).
> I would prefer to avoid starting custom clusters for these tests, because
> doing that makes the tests significantly slower.
> I see 3 possible solutions (easiest to hardest):
> - Start the minicluster with a specific timezone by default (e.g
> America/Los_Angeles). This could surprise people a bit, but wouldn't cause
> real issues as the minicluster is not meant for production. The simplest way
> to do this is setting env var TZ, but this could have some unintended side
> effects if other parts of the program use TZ too (e.g. logging).
> - Do the same but use a new startup flag instead of TZ. It would be possible
> to ensure that there are no side effects this way.
> - Add a query option to set local time. HIVE has a similar feature, see
> HIVE-16614.
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