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Posted to issues@kudu.apache.org by "HeLifu (JIRA)" <ji...@apache.org> on 2018/09/03 07:50:00 UTC

[jira] [Created] (KUDU-2566) support open-ended intervals & end up fetching one more rowset than necessary

HeLifu created KUDU-2566:
----------------------------

             Summary: support open-ended intervals &  end up fetching one  more rowset than necessary
                 Key: KUDU-2566
                 URL: https://issues.apache.org/jira/browse/KUDU-2566
             Project: Kudu
          Issue Type: Improvement
          Components: tablet, util
    Affects Versions: 1.0.0
            Reporter: HeLifu


In function of 'Tablet::CaptureConsistentIterators' of tablet.cc, there are two TODO:

1.TODO(todd): support open-ended intervals:

  In our kudu source code, we just cull row-sets when lower_bound_key and exclusive_upper_bound_key are existing at the same time. And if not, we will grab all row-sets of the tablet, then have to seek the key in ‘CFileSet::Iterator::PushdownRangeScanPredicate’ for the unnecessary row-sets (which will waste disk io).

2.TODO(todd): the upper bound key is exclusive, but the RowSetTree function takes an inclusive interval. So, we might end up fetching one more rowset than necessary.



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