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Posted to issues-all@impala.apache.org by "Zoram Thanga (JIRA)" <ji...@apache.org> on 2019/04/01 18:05:00 UTC
[jira] [Resolved] (IMPALA-7800) Reject or timeout new incoming
connections once --fe_service_threads limit is reached
[ https://issues.apache.org/jira/browse/IMPALA-7800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Zoram Thanga resolved IMPALA-7800.
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Resolution: Fixed
Fix Version/s: Impala 3.3.0
> Reject or timeout new incoming connections once --fe_service_threads limit is reached
> -------------------------------------------------------------------------------------
>
> Key: IMPALA-7800
> URL: https://issues.apache.org/jira/browse/IMPALA-7800
> Project: IMPALA
> Issue Type: Improvement
> Components: Clients
> Affects Versions: Impala 3.0, Impala 2.12.0
> Reporter: Michael Ho
> Assignee: Zoram Thanga
> Priority: Major
> Fix For: Impala 3.3.0
>
>
> Currently, the number of frontend service threads is controlled by {{--fe_service_threads}}. Once this limit is reached, the worker threads of {{connection_setup_pool}} will block until some of the service threads exit. New incoming connections will be buffered in a queue in {{connection_setup_pool}} until it fills up. Currently, there is no time out for all these buffered connections in the queue. Consequently, if the number of frontend service threads max'ed out for an extended period of time, a client trying to connect to Impala will feel "stuck" until a front end service thread is available.
> We should consider either rejecting any new connections once {{--fe_service_threads}} limit is reached or imposing a tunable upper bound on the wait time for connections in the queue to improve the users' experience. cc'ing [~zoram]
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