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Posted to issues-all@impala.apache.org by "ASF subversion and git services (JIRA)" <ji...@apache.org> on 2019/07/03 20:25:00 UTC
[jira] [Commented] (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:comment-tabpanel&focusedCommentId=16878147#comment-16878147 ]
ASF subversion and git services commented on IMPALA-7800:
---------------------------------------------------------
Commit 19430082f34ae69c86dd3cd6078f8855e9e8646d in impala's branch refs/heads/master from Alex Rodoni
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=1943008 ]
IMPALA-8427: [DOCS] Document the new startup flag IMPALA-7800 introduced
- Added a new doc impala_client.xml as the overview of Impala impala
client access.
Change-Id: I1a4c1975721c32a78a003d91babc5d2bb90f3949
Reviewed-on: http://gerrit.cloudera.org:8080/13762
Tested-by: Impala Public Jenkins <im...@cloudera.com>
Reviewed-by: Michael Ho <kw...@cloudera.com>
> 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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