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From "Rakesh R (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14402) Use FileChannel.transferTo() method for transferring block to SCM cache
Date Sun, 26 May 2019 08:49:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16848372#comment-16848372
] 

Rakesh R commented on HDFS-14402:
---------------------------------

Thank you [~PhiloHe] for the patch. The performance result looks promising and shows time
reduction. Probably, can plan test comparison between HDD and NVMe devices, that would be
interesting and can attach to umbrella Jira as well.

+1 LGTM, I will commit the latest patch shortly.

> Use FileChannel.transferTo() method for transferring block to SCM cache
> -----------------------------------------------------------------------
>
>                 Key: HDFS-14402
>                 URL: https://issues.apache.org/jira/browse/HDFS-14402
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: caching, datanode
>            Reporter: Feilong He
>            Assignee: Feilong He
>            Priority: Major
>         Attachments: HDFS-14402.000.patch, HDFS-14402.001.patch, HDFS-14402.002.patch,
With-Cache-Improvement-Patch.png, Without-Cache-Improvement-Patch.png
>
>
> We will consider to use transferTo API to improve SCM's cach performace.



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