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https://issues.apache.org/jira/browse/HDFS-15254?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zheng Wang updated HDFS-15254:
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    Description: We use ONE_SSD as storagy policy in HBase,but when using 
bulkload,i found it could not specify a datanode to placement the SSD 
replica,so the regionserver that hold the region may only can read the local 
DISK replica,because the SSD replica is in remote node.  (was: We use ONE_SSD 
as storagy policy in HBase,but when using bulkload,i found it could not specify 
a datanode to placement the SSD replica,so the regionserver that hold the 
region may only can read the local DISK replica,because the SSD replic is in 
remote node.)

> Namenode should have a favored ssd nodes hint for ssd related storagy policy
> ----------------------------------------------------------------------------
>
>                 Key: HDFS-15254
>                 URL: https://issues.apache.org/jira/browse/HDFS-15254
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: block placement
>            Reporter: Zheng Wang
>            Priority: Major
>
> We use ONE_SSD as storagy policy in HBase,but when using bulkload,i found it 
> could not specify a datanode to placement the SSD replica,so the regionserver 
> that hold the region may only can read the local DISK replica,because the SSD 
> replica is in remote node.



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