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From "Wei Zhou (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-13762) Support non-volatile storage class memory(SCM) in HDFS cache directives
Date Thu, 15 Nov 2018 02:51:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16687419#comment-16687419
] 

Wei Zhou commented on HDFS-13762:
---------------------------------

After discussed with [~Sammi] offline, I'll take over the responsibilities to follow on this
issue. Thanks [~Sammi] for the great design and initial patch! I made some changes to trigger
checks.

> Support non-volatile storage class memory(SCM) in HDFS cache directives
> -----------------------------------------------------------------------
>
>                 Key: HDFS-13762
>                 URL: https://issues.apache.org/jira/browse/HDFS-13762
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: caching, datanode
>            Reporter: Sammi Chen
>            Assignee: Wei Zhou
>            Priority: Major
>         Attachments: HDFS-13762.000.patch, HDFS-13762.001.patch, SCMCacheDesign-2018-11-08.pdf,
SCMCacheTestPlan.pdf
>
>
> No-volatile storage class memory is a type of memory that can keep the data content after
power failure or between the power cycle. Non-volatile storage class memory device usually
has near access speed as memory DIMM while has lower cost than memory.  So today It is usually
used as a supplement to memory to hold long tern persistent data, such as data in cache. 
> Currently in HDFS, we have OS page cache backed read only cache and RAMDISK based lazy
write cache.  Non-volatile memory suits for both these functions. 
> This Jira aims to enable storage class memory first in read cache. Although storage class
memory has non-volatile characteristics, to keep the same behavior as current read only cache,
we don't use its persistent characteristics currently.  
>  
>  
>  



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