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https://issues.apache.org/jira/browse/HADOOP-15027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16250920#comment-16250920
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Genmao Yu commented on HADOOP-15027:
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How to optimize random IO is a major piece of work. IIUC, [[email protected]]
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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