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Posted to hdfs-dev@hadoop.apache.org by "SammiChen (JIRA)" <ji...@apache.org> on 2018/07/24 09:11:00 UTC

[jira] [Created] (HDFS-13762) Support non-volatile memory or storage class memory(SCM) in HDFS cache

SammiChen created HDFS-13762:
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             Summary: Support non-volatile memory or storage class memory(SCM) in HDFS cache
                 Key: HDFS-13762
                 URL: https://issues.apache.org/jira/browse/HDFS-13762
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: caching, datanode
            Reporter: SammiChen
            Assignee: SammiChen


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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