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https://issues.apache.org/jira/browse/HBASE-17917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15989776#comment-15989776
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Duo Zhang commented on HBASE-17917:
-----------------------------------
Yeah we should change the title but seems it will be very long since this patch
also creates a separated reader for streaming read...
1. Yeah I can imagine, under this scenario default will perform worse than
stream. And under some other scenario default will perform worse than pread.
For example, you reopen the scanner but the scanner is closed without read any
new data... But in most cases I think it is good enough? User can set the
ReadType explicitly if he/she knows which one is better. And we can also keep
improving the trySwitchToStreamRead method to make it more intelligent.
2. 2.7.3 so I think it contains the fix.
3. I haven't collected the information since this is not a stress test and the
DN is not overloaded. Will collect the information next time when I'm back. Out
for vacation in the next 3 days.
Thanks.
> Use pread by default for all user scan
> --------------------------------------
>
> Key: HBASE-17917
> URL: https://issues.apache.org/jira/browse/HBASE-17917
> Project: HBase
> Issue Type: Sub-task
> Components: scan
> Affects Versions: 2.0.0
> Reporter: Duo Zhang
> Assignee: Duo Zhang
> Fix For: 2.0.0
>
> Attachments: HBASE-17917.patch, HBASE-17917-v1.patch,
> HBASE-17917-v2.patch, HBASE-17917-v2.patch, HBASE-17917-v3.patch,
> HBASE-17917-v4.patch, HBASE-17917-v5.patch
>
>
> As said in the parent issue. We need some benchmark here first.
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