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Posted to issues@kudu.apache.org by "HeLifu (JIRA)" <ji...@apache.org> on 2018/09/06 08:52:00 UTC

[jira] [Updated] (KUDU-2566) Enhance rowset tree pruning and fix a perf todo

     [ https://issues.apache.org/jira/browse/KUDU-2566?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

HeLifu updated KUDU-2566:
-------------------------
    Summary: Enhance rowset tree pruning and fix a perf todo  (was: Enhance rowset tree pruning)

> Enhance rowset tree pruning and fix a perf todo
> -----------------------------------------------
>
>                 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
>            Priority: Major
>
> 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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