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From "Genmao Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15027) Improvements for Hadoop read from AliyunOSS
Date Tue, 14 Nov 2017 05:56:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16250920#comment-16250920

Genmao Yu commented on HADOOP-15027:

How to optimize random IO is a major piece of work.  IIUC, [~stevel@apache.org] you said you
would focus on performance of column format file, i.e. random IO. Is there any jira to trace?
[~wujinhu] Let us focus on how to improve sequential IO, but not random IO. IMHO, {{SemaphoredDelegatingExecutor}}
is a good common class, we may move this class to hadoop-common. I will open a jira to do
this work if you guys do not mind. So this jira will be pending for a while. Besides, could
you please post a more detailed performance test result?

> Improvements for Hadoop read from AliyunOSS
> -------------------------------------------
>                 Key: HADOOP-15027
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15027
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/oss
>    Affects Versions: 3.0.0
>            Reporter: wujinhu
>            Assignee: wujinhu
>         Attachments: HADOOP-15027.001.patch, HADOOP-15027.002.patch, HADOOP-15027.003.patch
> Currently, read performance is poor when Hadoop reads from AliyunOSS. It needs about
1min to read 1GB from OSS.
> Class AliyunOSSInputStream uses single thread to read data from AliyunOSS,  so we can
refactor this by using multi-thread pre read to improve this.

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