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https://issues.apache.org/jira/browse/HDFS-10953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15547125#comment-15547125
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Konstantin Shvachko commented on HDFS-10953:
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Hey [~shahrs87], thanks for volunteering.
One thing though, this should be dependent on HDFS-10301. It wouldn't make 
sense to collide the two. I'll re-link issues to emphasize this.

> Remove single-rpc block reports.
> --------------------------------
>
>                 Key: HDFS-10953
>                 URL: https://issues.apache.org/jira/browse/HDFS-10953
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.6.4
>            Reporter: Konstantin Shvachko
>            Assignee: Rushabh S Shah
>
> Currently a DataNode can send block reports as a single RPC for all storages 
> together or as multiple per storage RPCs. The choice is based on the size of 
> the report and is controlled by the configuration parameter 
> {{dfs.blockreport.split.threshold}}.
> As discussed in HDFS-10301, all block reports should be per-storage multiple 
> RPCs.



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