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https://issues.apache.org/jira/browse/IMPALA-10219?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vihang Karajgaonkar resolved IMPALA-10219.
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Fix Version/s: Impala 4.0
Resolution: Fixed
> Add a query option to simulate catalogd HDFS listing delays
> -----------------------------------------------------------
>
> Key: IMPALA-10219
> URL: https://issues.apache.org/jira/browse/IMPALA-10219
> Project: IMPALA
> Issue Type: Sub-task
> Reporter: Vihang Karajgaonkar
> Assignee: Vihang Karajgaonkar
> Priority: Minor
> Fix For: Impala 4.0
>
>
> This parent issue (IMPALA-6671) caused serious query backlog on large setups
> where namenode response times are slower for whatever reasons. While you can
> tune the namenode to some extent it is still problematic that Impala HDFS
> operations which happen while holding the table lock block other unrelated
> queries.
> In order to simulate such problems in the product it would be nice to
> introduce a query option which adds a artificial delay in the RPCs to
> namenode when the table is being loaded. A query option is preferred over
> service level configuration since, that way it is easier to model a slow
> blocking query and a unrelated fast query in the test suite.
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