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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