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https://issues.apache.org/jira/browse/HADOOP-15027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16249055#comment-16249055
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Genmao Yu edited comment on HADOOP-15027 at 11/13/17 2:49 AM:
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[~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
[[email protected]] 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
[[email protected]] 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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