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Posted to hdfs-issues@hadoop.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2023/10/02 02:40:00 UTC

[jira] [Commented] (HDFS-17216) When distcp handle the small files, the bandwidth parameter will be invalid, resulting in serious overspeed behavior

    [ https://issues.apache.org/jira/browse/HDFS-17216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17770950#comment-17770950 ] 

ASF GitHub Bot commented on HDFS-17216:
---------------------------------------

xiaojunxiang2023 opened a new pull request, #6138:
URL: https://github.com/apache/hadoop/pull/6138

   jira:  https://issues.apache.org/jira/browse/HDFS-17216
   
   When distcp copies small files (file size slightly smaller than the bandwidth), the throbber only starts to throb after 1 second, and the throttled is specific to a single file. so the throbber becomes invalid, causing distcp to fill the cluster bandwidth and crush production traffic, which is a terrible thing.
   ![DiscpAnalyze](https://github.com/apache/hadoop/assets/65019264/db2f6347-8ff9-4b51-bb3d-11026c091a43)
   




> When distcp handle the small files, the bandwidth parameter will be invalid, resulting in serious overspeed behavior
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-17216
>                 URL: https://issues.apache.org/jira/browse/HDFS-17216
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: distcp
>    Affects Versions: 3.3.4
>            Reporter: xiaojunxiang
>            Priority: Major
>         Attachments: DiscpAnalyze.jpg
>
>
> When distcp copies small files (file size slightly smaller than the bandwidth), the throbber only starts to throb after 1 second, and the throttled is specific to a single file. so the throbber becomes invalid, causing distcp to fill the cluster bandwidth and crush production traffic, which is a terrible thing.



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