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https://issues.apache.org/jira/browse/HBASE-10421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13883600#comment-13883600
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Andrew Purtell commented on HBASE-10421:
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bq. I found that 0.98 is almost 35% slower than 0.94.
I wonder what the impact of HBASE-4811 is, this was first introduced in 0.98
> Investigate scan performance in 0.96 and later
> ----------------------------------------------
>
> Key: HBASE-10421
> URL: https://issues.apache.org/jira/browse/HBASE-10421
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.98.0
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
>
> Testing the "internal friction" of scanning in HBase (all data in the block
> cache, and all rows filtered at the server by a ValueFilter, so that one
> really measures the work HBase does internally), I found that 0.98 is almost
> 35% slower than 0.94.
> Scanning 50m rows (one col each, 8 byte keys, 8 byte values) takes 13.2 in
> 0.94.17-SNAPSHOT and 18.5s in 0.98.
> This probably came about with all the protobuf changes in 0.96.
> It should be possible to bring back to par with 0.94.
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