[ https://issues.apache.org/jira/browse/HDFS-13762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wei Zhou updated HDFS-13762: ---------------------------- Attachment: HDFS-13762.002.patch > 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: Wei Zhou > Priority: Major > Attachments: HDFS-13762.000.patch, HDFS-13762.001.patch, > HDFS-13762.002.patch, SCMCacheDesign-2018-11-08.pdf, SCMCacheTestPlan.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. > > > -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org