ramkrishna.s.vasudevan created HBASE-16501:
----------------------------------------------
Summary: seekToPrevoiusRow() can be optimized
Key: HBASE-16501
URL: https://issues.apache.org/jira/browse/HBASE-16501
Project: HBase
Issue Type: Improvement
Components: Performance, Scanners
Affects Versions: 2.0.0
Reporter: ramkrishna.s.vasudevan
Assignee: ramkrishna.s.vasudevan
Fix For: 2.0.0
Need to check the details and see how to implement it. But the problem is this
In seekToPReviousRow impl in case of a reverse scan, say we have rows row10000
to row20000. We are doing a reverse scan.
The scan starts from row20000 and we read all columns. Assume this row was
skipped due to mvcc we move to the previous row 'row19999'. Now we read this
row19999 and even if this does not match in mvcc we skip and again read
row20000 and do the same.
Like this we keep doing til we come to row10000 and this time we read til
row20000 just to k now we have to skip it. The same problem happens in
Storefilescanner also and there we do lot of seek and next(). Better to solve
this case.
[~zjushch] - FYI.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
