[jira] [Reopened] (KUDU-1897) GSSAPI negotiation single-threaded and very slow under concurrency

["Todd Lipcon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KUDU-1897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon reopened KUDU-1897:
-------------------------------

Oops, realized this isn't quite committed yet (waiting on the patch that actually disables the rcache)

> GSSAPI negotiation single-threaded and very slow under concurrency
> ------------------------------------------------------------------
>
>                 Key: KUDU-1897
>                 URL: https://issues.apache.org/jira/browse/KUDU-1897
>             Project: Kudu
>          Issue Type: Bug
>          Components: rpc, security
>    Affects Versions: 1.3.0
>            Reporter: Todd Lipcon
>            Assignee: Dan Burkert
>            Priority: Critical
>             Fix For: 1.3.0
>
>         Attachments: rcache.png
>
>
> I'm running an Impala workload with ~10 concurrent clients submitting queries that take a few seconds each on a 9 node cluster. The master is pegging on core in negotiation, and has a bunch of other negotiation threads blocked on a mutex within SASL.
> Each negotiation is taking 2-3 seconds due to waiting on this lock.
> This severely restricts connection throughput, and probably needs to be addressed for 1.3.



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