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https://issues.apache.org/jira/browse/HDFS-13762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16803745#comment-16803745
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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/26534/console |
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This message was automatically generated.
> 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-2019-3-27.pdf,
> SCMCacheTestPlan.pdf, SCM_Cache_Perf_Results-v1.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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