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https://issues.apache.org/jira/browse/IMPALA-14460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18022523#comment-18022523
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Michael Smith commented on IMPALA-14460:
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[~csringhofer] has explored this a bit in https://gerrit.cloudera.org/c/23226/.
> Implement keep-alive on HS2-HTTP connections
> --------------------------------------------
>
> Key: IMPALA-14460
> URL: https://issues.apache.org/jira/browse/IMPALA-14460
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend, Clients
> Reporter: Michael Smith
> Priority: Major
>
> impala-shell does not use HTTP keep-alive with HS2-HTTP connections, causing
> it to establish a new connection each time the client needs to send a
> request. In busy environments, this can exhaust previously working
> {{accepted_cnxn_setup_thread_pool_size}} settings.
> We should implement keep-alive for HS2-HTTP connections, which may require
> improvements in both impala-shell and the server implementation.
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