Akira Ajisaka commented on HDFS-13046:

Good idea. If the network bandwidth of the cluster is not the bottleneck (e.g. 
A DN has 10G NIC and a few HDDs), the option may improve the performance. What 
do you think, [~arpitagarwal] and [~xiaochen]?

> consider load of datanodes when read blocks of file
> ---------------------------------------------------
>                 Key: HDFS-13046
>                 URL: https://issues.apache.org/jira/browse/HDFS-13046
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: hu xiaodong
>            Assignee: hu xiaodong
>            Priority: Minor
>         Attachments: 
> HDFS-13046-considerLoadAfterSortBydistance-001-sample.patch, 
> HDFS-13046-sample.patch
> When sorting block locations, we just consider the distance of datanodes. can 
> we consider the load of datanodes? We can add a configuration such as 
> 'dfs.namenode.reading.considerLoad', if set to true, then sort the 
> blocklocations by load of the datanodes, otherwise sort by distance.

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