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Posted to issues@kudu.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2017/10/09 19:34:00 UTC

[jira] [Created] (KUDU-2184) Avoid large allocations in MemRowSet arena

Todd Lipcon created KUDU-2184:
---------------------------------

             Summary: Avoid large allocations in MemRowSet arena
                 Key: KUDU-2184
                 URL: https://issues.apache.org/jira/browse/KUDU-2184
             Project: Kudu
          Issue Type: Improvement
          Components: perf
    Affects Versions: 1.6.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon


tcmalloc caches metadata for spans of free space only up to a certain size (1MB). For larger allocations, an O(n) search is used, which can be quite slow according to https://github.com/gperftools/gperftools/issues/535 . Based on some recent analysis of latency outliers in a long-running cluster, I think we may be hitting this issue on the MRS Arena. We should set the max component size to 1MB to avoid it.



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