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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17917) Use pread by default for all user scan
Date Sat, 29 Apr 2017 05:03:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15989763#comment-15989763

Lars Hofhansl commented on HBASE-17917:

The title does not quite reflect the patch, since it does try to switch to streaming reads.

Couple of question:
# did you try with many store files and with many column families. preads even when followed
by a switch to streaming involve a lot of seeking.
# which version of HDFS did you test this against? Does that version have HDFS-6735 fixed?
# what's the load on the data nodes that you observe?

> 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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