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https://issues.apache.org/jira/browse/HDFS-15392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17154422#comment-17154422
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jianghua zhu commented on HDFS-15392:
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[~weichiu] , I very much agree with your suggestion.
> DistrbutedFileSystem#concat api can create large number of small blocks
> -----------------------------------------------------------------------
>
> Key: HDFS-15392
> URL: https://issues.apache.org/jira/browse/HDFS-15392
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Lokesh Jain
> Priority: Major
>
> DistrbutedFileSystem#concat moves blocks from source to target. If the api is
> repeatedly used on small files it can create large number of small blocks in
> the target file. The Jira aims to optimize the api to avoid the issue of
> small blocks.
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