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From "Feilong He (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-13762) Support non-volatile storage class memory(SCM) in HDFS cache directives
Date Wed, 27 Mar 2019 08:33:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-13762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Feilong He updated HDFS-13762:
    Attachment: SCMCacheTestPlan-2019-3-27.pdf

> 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,
> 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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