Tim Armstrong created KUDU-2721:
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Summary: 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
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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