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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-13762) Support non-volatile storage class memory(SCM) in HDFS cache directives
Date Tue, 26 Mar 2019 16:05:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16801878#comment-16801878
] 

Hadoop QA commented on HDFS-13762:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  0s{color} | {color:blue}
Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  7s{color} | {color:red}
HDFS-13762 does not apply to trunk. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-13762 |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/26520/console |
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> 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: Feilong He
>            Priority: Major
>         Attachments: HDFS-13762.000.patch, HDFS-13762.001.patch, HDFS-13762.002.patch,
HDFS-13762.003.patch, HDFS-13762.004.patch, HDFS-13762.005.patch, HDFS-13762.006.patch, HDFS-13762.007.patch,
HDFS-13762.008.patch, SCMCacheDesign-2018-11-08.pdf, SCMCacheDesign-2019-3-26.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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