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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17917) Use pread by default for all user scan
Date Wed, 26 Apr 2017 10:28:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15984546#comment-15984546
] 

Duo Zhang commented on HBASE-17917:
-----------------------------------

The result is optimistic.

The commands are the same with above.

One Thread Test
PREAD    : ~220s
STREAM : ~187s
DEFAULT: ~187s

Ten Theads Test
PREAD    : ~32s
STREAM : ~27s
DEFAULT: ~27s

Notice that I've removed the streamLock in HFileReaderImpl as we will always create a new
reader for stream read now, so the result of 10 threads test for STREAM is also much better.

I guess you will like this, sir [~stack].


> 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
>
>
> As said in the parent issue. We need some benchmark here first.



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