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https://issues.apache.org/jira/browse/HIVE-26584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17612252#comment-17612252
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Stamatis Zampetakis commented on HIVE-26584:
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Thanks for tracking this down [~jfs]. Can you elaborate a bit more on what do
you mean concurrently?
I don't think concurrent test execution is supported so I am trying to
understand why we bump into this problem. In Hive CI, the tests are somewhat
running concurrently but this is done in different containers so normally there
shouldn't be any interference.
> compressed_skip_header_footer_aggr.q is flaky
> ---------------------------------------------
>
> Key: HIVE-26584
> URL: https://issues.apache.org/jira/browse/HIVE-26584
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Affects Versions: 4.0.0-alpha-2
> Reporter: John Sherman
> Assignee: John Sherman
> Priority: Major
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> One of my PRs compressed_skip_header_footer_aggr.q was failing with
> unexpected diff. Such as:
> {code:java}
> TestMiniLlapLocalCliDriver.testCliDriver:62 Client Execution succeeded but
> contained differences (error code = 1) after executing
> compressed_skip_header_footer_aggr.q
> 69,71c69,70
> < 1 2019-12-31
> < 2 2018-12-31
> < 3 2017-12-31
> ---
> > 2 2019-12-31
> > 3 2019-12-31
> 89d87
> < NULL NULL
> 91c89
> < 2 2018-12-31
> ---
> > 2 2019-12-31
> 100c98
> < 1
> ---
> > 2
> 109c107
> < 1 2019-12-31
> ---
> > 2 2019-12-31
> 127,128c125,126
> < 1 2019-12-31
> < 3 2017-12-31
> ---
> > 2 2019-12-31
> > 3 2019-12-31
> 146a145
> > 2 2019-12-31
> 155c154
> < 1
> ---
> > 2 {code}
> Investigating it, it did not seem to fail when executed locally. Since I
> suspected test interference I searched for the tablenames/directories used
> and discovered empty_skip_header_footer_aggr.q which uses the same table
> names AND external directories.
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