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https://issues.apache.org/jira/browse/HADOOP-15027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16249072#comment-16249072
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wujinhu edited comment on HADOOP-15027 at 11/13/17 3:29 AM:
------------------------------------------------------------
Updates(HADOOP-15027.002.patch):
1. I have moved thread pool from InputStream to FileSystem.
2. disable pre-fetch in random IO.
Currently, I have tested sequential read & aggressive random read performance
oss.RandomSeek: file length 1090000002
oss.RandomSeek: sequential read used 14.964
oss.RandomSeek: random read used 61.353
When I tested aggressive random read, I divided this file into multipart(each
part is 1MB) and shuffle all the parts to read.
I am thinking to continue to improve random reads.
was (Author: wujinhu):
Updates:
1. I have moved thread pool from InputStream to FileSystem.
2. disable pre-fetch in random IO.
Currently, I have tested sequential read & aggressive random read performance
oss.RandomSeek: file length 1090000002
oss.RandomSeek: sequential read used 14.964
oss.RandomSeek: random read used 61.353
When I tested aggressive random read, I divided this file into multipart(each
part is 1MB) and shuffle all the parts to read.
I am thinking to continue to improve random reads.
> 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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