Duo Zhang created HBASE-20525:
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Summary: Refactoring the code of read path
Key: HBASE-20525
URL: https://issues.apache.org/jira/browse/HBASE-20525
Project: HBase
Issue Type: Umbrella
Components: scan
Reporter: Duo Zhang
Fix For: 3.0.0
The known problems of the current implementation:
1. 'Seek or skip' should be decided at StoreFileScanner level, not StoreScanner.
2. As now we support creating multiple StoreFileReader instances for a single
HFile, we do not need to load the file info and other meta infos every time
when creating a new StoreFileReader instance.
3. 'Pread or stream' should be decided at StoreFileScanner level, not
StoreScanner.
4. Make sure that we can return at any point during a scan, at least when
filterRowKey we can not stop until we reach the next row, no matter how many
cells we need to skip...
5. Doing bytes comparing everywhere, where we need to know if there is a row
change, a family change, a qualifier change, etc. This is a performance killer.
And the most important thing is that, the code is way too complicated now and
become out of control...
This should be done before our 3.0.0 release.
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