[jira] [Commented] (IMPALA-7638) Lower default timeout for connection setup

["Lars Volker (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IMPALA-7638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16634340#comment-16634340 ] 

Lars Volker commented on IMPALA-7638:
-------------------------------------

Thanks for the feedback, [~jfs]. Here's the relevant quote by [~sailesh] in the review:

{quote}
We would also want the client connection timeout to default to a pretty high number since on large clusters, we've seen Kerberos negotiations take up to a few minutes.
I would prefer keeping the timeout to 5 minutes. It's not ideal, however, we would rather not see queries fail because of timed out negotiations vs. optimize for an even worse case of clients hung for 5 minutes (which is configurable by a flag if the user chooses to do so). This is the same reason we keep the internal connection timeout so high, since we'd rather see progress than a failed query due to one timed out connection.
{quote}

I suspect that with KRPC enabled we should not see Kerberos negotiations take several minutes, but we should confirm this with some stress tests.

> Lower default timeout for connection setup
> ------------------------------------------
>
>                 Key: IMPALA-7638
>                 URL: https://issues.apache.org/jira/browse/IMPALA-7638
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Backend
>    Affects Versions: Impala 3.1.0
>            Reporter: Lars Volker
>            Priority: Major
>             Fix For: Impala 2.11.0
>
>
> IMPALA-5394 added the sasl_connect_tcp_timeout_ms flag with a default timeout of 5 minutes. This seems too long as broken clients will prevent new clients from establishing connections for this time. In addition to increasing the acceptor thread pool size (IMPALA-7565) we should lower this timeout considerably, e.g. to 5 seconds.



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