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Posted to issues@kudu.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2016/12/01 06:34:58 UTC

[jira] [Created] (KUDU-1777) glog drop_log_memory causes a lot of IO to log dir

Todd Lipcon created KUDU-1777:
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             Summary: glog drop_log_memory causes a lot of IO to log dir
                 Key: KUDU-1777
                 URL: https://issues.apache.org/jira/browse/KUDU-1777
             Project: Kudu
          Issue Type: Improvement
          Components: util
    Affects Versions: 1.1.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Critical


glog is configured by default to call posix_fadvise with DONTNEED every time it flushes, and also configured such that any WARN or above causes such a flush. Every such fadvise call generates new IO to the log directory, journal commits, etc, and I think this may be affecting latency and stability adversely.



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