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From "Yu Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9666) Enable hdfs-client to read even remote SSD/RAM prior to local disk replica to improve random read
Date Wed, 07 Jun 2017 07:37:18 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16040413#comment-16040413
] 

Yu Li commented on HDFS-9666:
-----------------------------

Thanks for chiming in with performance data [~whisper_deng]. Maybe we should revive this one?
[~aderen] [~arpiagariu] [~vinodkv] Thanks.

> 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: ade
>         Attachments: HDFS-9666.0.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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