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https://issues.apache.org/jira/browse/HDFS-13762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sammi Chen updated HDFS-13762:
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Summary: Support non-volatile storage class memory(SCM) in HDFS cache
directives (was: Support non-volatile memory or storage class memory(SCM) in
HDFS cache)
> 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: Sammi Chen
> Priority: Major
>
> Non-volatile memory is a type of memory that can keep the data content after
> power failure or between the power cycle. Non-volatile 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 non-volatile memory first in read cache, and then
> lazy write case.
>
>
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