YaYun-Wang commented on a change in pull request #2189: URL: https://github.com/apache/hadoop/pull/2189#discussion_r476125679
########## File path: hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/ArchivalStorage.md ########## @@ -27,15 +27,17 @@ The frameworks provided by Heterogeneous Storage and Archival Storage generalize Storage Types and Storage Policies ---------------------------------- -### Storage Types: ARCHIVE, DISK, SSD and RAM\_DISK +### Storage Types: ARCHIVE, DISK, SSD, NVDIMM and RAM\_DISK The first phase of [Heterogeneous Storage (HDFS-2832)](https://issues.apache.org/jira/browse/HDFS-2832) changed datanode storage model from a single storage, which may correspond to multiple physical storage medias, to a collection of storages with each storage corresponding to a physical storage media. It also added the notion of storage types, DISK and SSD, where DISK is the default storage type. A new storage type *ARCHIVE*, which has high storage density (petabyte of storage) but little compute power, is added for supporting archival storage. Another new storage type *RAM\_DISK* is added for supporting writing single replica files in memory. -### Storage Policies: Hot, Warm, Cold, All\_SSD, One\_SSD, Lazy\_Persist and Provided +And a new storage type *NVDIMM*, which is a non-volatile memory that will retains the datastored on the memory when the computer is powered down or system crashes and restore the data when the machine powered on, is added for supporting archival storage. Review comment: The original description is indeed inaccurate , and has been modified as suggested. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
