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https://issues.apache.org/jira/browse/HDFS-9666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16383359#comment-16383359
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Jiandan Yang  commented on HDFS-9666:
-------------------------------------

upload v4 patch:
set refetchIfRequired=true when chooseDataNode in fetchBlockByteRange and fix 
ut error

> Enable hdfs-client to read even remote SSD/RAM prior to local disk replica to 
> improve random read
> -------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-9666
>                 URL: https://issues.apache.org/jira/browse/HDFS-9666
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>    Affects Versions: 2.6.0, 2.7.0
>            Reporter: ade
>            Assignee: Jiandan Yang 
>            Priority: Major
>         Attachments: HDFS-9666.0.patch, HDFS-9666.001.patch, 
> HDFS-9666.002.patch, HDFS-9666.003.patch, HDFS-9666.004.patch
>
>
> We want to improve random read performance of HDFS for HBase, so enabled the 
> heterogeneous storage in our cluster. But there are only ~50% of datanode & 
> regionserver hosts with SSD. we can set hfile with only ONE_SSD not ALL_SSD 
> storagepolicy and the regionserver on none-SSD host can only read the local 
> disk replica . So we developed this feature in hdfs client to read even 
> remote SSD/RAM prior to local disk replica.



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