[jira] [Assigned] (KUDU-2721) CHECK can be hit when there are gaps in present CPU numbers

["Andrew Wong (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KUDU-2721?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Wong reassigned KUDU-2721:
---------------------------------

    Assignee: Tim Armstrong

> CHECK can be hit when there are gaps in present CPU numbers
> -----------------------------------------------------------
>
>                 Key: KUDU-2721
>                 URL: https://issues.apache.org/jira/browse/KUDU-2721
>             Project: Kudu
>          Issue Type: Bug
>    Affects Versions: 1.8.0
>         Environment: SLES12-SP3
>            Reporter: Tim Armstrong
>            Assignee: Tim Armstrong
>            Priority: Critical
>              Labels: crash
>         Attachments: cpus.cc
>
>
> We saw a case where Impala is crashing in the Kudu client and it seems to be because the "present" string can have multiple ranges in it - "0-15,32-47\n" in this case.  See https://github.com/apache/kudu/blob/148a0c7bec6554724339a2235cbd723fb74be339/src/kudu/gutil/sysinfo.cc#L177
> I've attached a small test program based on the code illustrating that the assert gets hit.
> I think we should figure out all of the possible formats for the present string and make sure we handle them. Or figure out a different way to get equivalent info.
> A workaround for the case that we saw was to disable hyperthreading, which changed the string to being a single range.



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