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https://issues.apache.org/jira/browse/KUDU-2566?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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HeLifu updated KUDU-2566:
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Summary: Enhance rowset tree pruning and discard string copy while querying
(was: Enhance rowset tree pruning and discard string copying while querying)
> Enhance rowset tree pruning and discard string copy while querying
> ------------------------------------------------------------------
>
> 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
>
> 1.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).
> *After modification*, we could cull rowsets whether lower_bound_key or
> exclusive_upper_bound_key exists or not;
> 2.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.
> *After modification*, the upper bound will only fetch the exactly rowsets;
> 3.Perf improvement: using raw slices instead of copying to strings while
> querying.
> *After modification*, the copying from slices to string is discarded.
> 4.Simplify the logic of CaptureConsistentIterators in tablet.cc.
> *After modification*, the function logic will be simpler.
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