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From "Genmao Yu (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HADOOP-15027) Improvements for Hadoop read from AliyunOSS
Date Mon, 13 Nov 2017 03:20:01 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16249055#comment-16249055
] 

Genmao Yu edited comment on HADOOP-15027 at 11/13/17 3:19 AM:
--------------------------------------------------------------

[~wujinhu] Could you please point out the diff between current patch and the previous one?
It will helpful for others to review. And just like [~stevel@apache.org] said, it is very
expensive to use pre-fetch in random IO and thread pool in each input stream. Let us take
a discussion offline.


was (Author: unclegen):
[~wujingtong] Could you please point out the diff between current patch and the previous one?
It will helpful for others to review. And just like [~stevel@apache.org] said, it is very
expensive to use pre-fetch in random IO and thread pool in each input stream. Let us take
a discussion offline.

> 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
>
>
> 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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