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https://issues.apache.org/jira/browse/HBASE-12761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14260180#comment-14260180
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Jurriaan Mous commented on HBASE-12761:
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[~stack] I noticed my previous patch return assert errors for too many results
in reversed scans so I discovered I needed to contract the key for the reverse
scans instead of advancing it with a 0. Previously the last result would be
skipped on the server by the RPC scan I removed and that was a different key
than the forward scanner. So this line is a bug fix compared to previous patch
and not the current implementation.
> On region jump ClientScanners should get next row start key instead of a skip.
> ------------------------------------------------------------------------------
>
> Key: HBASE-12761
> URL: https://issues.apache.org/jira/browse/HBASE-12761
> Project: HBase
> Issue Type: Improvement
> Reporter: Jurriaan Mous
> Assignee: Jurriaan Mous
> Attachments: HBASE-12761-v1.patch, HBASE-12761-v2.patch,
> HBASE-12761-v2.patch, HBASE-12761.patch
>
>
> While working on async scanner I had some trouble with the extra RPC calls
> that happen to let the Scanner advance 1 row so it skips the last already
> known row.
> This RPC call can be avoided by letting the start key be the last row with an
> appended 0. This saves quite some logic from the scanners and improves
> performance by saving extra RPC calls.
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