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https://issues.apache.org/jira/browse/HDFS-5463?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang resolved HDFS-5463.
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Resolution: Duplicate
As Uma said above, I think this is handled as of 2.1.0 by HDFS-4305. Please
re-open if you feel this is incorrect. Thanks Vinay.
> NameNode should limit the number of blocks per file
> ---------------------------------------------------
>
> Key: HDFS-5463
> URL: https://issues.apache.org/jira/browse/HDFS-5463
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Vinay
> Assignee: Vinay
>
> Currently there is no limit to number of blocks user can write to a file.
> And blocksize also can be set to minimum possible.
> User can write any number of blocks continously, which may create problems in
> NameNodes performance and service as the number of blocks of file increases.
> Because each time new block allocated, all blocks of the file will be
> persisted, and this can cause serious performance degradation
> So proposal is to limit the number of maximum blocks a user can write to a
> file.
> May be 1024 blocks(if 128*MB is block size then 128 GB can be max file size)
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