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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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Description:
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.
was:
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.
> 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
>
> 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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