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ASF GitHub Bot logged work on HDFS-15025: ----------------------------------------- Author: ASF GitHub Bot Created on: 04/Sep/20 10:01 Start Date: 04/Sep/20 10:01 Worklog Time Spent: 10m Work Description: YaYun-Wang commented on a change in pull request #2189: URL: https://github.com/apache/hadoop/pull/2189#discussion_r477304478 ########## File path: hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/FsVolumeSpi.java ########## @@ -77,6 +77,9 @@ /** Returns true if the volume is NOT backed by persistent storage. */ boolean isTransientStorage(); Review comment: The "isTransientStorage" method is still available. In the original code,` isTransient()` and `isTransientStorage` methods are used to determine whether to support FsDatasetCache, Persistent, Quota, and Movable. FsDatasetCache will be used When the storage type is persistent. NVDIMM is RAM to some extent, which is fast. However, NVDIMM is a persistent storage type. Then, `isTransient()` and `isTransientStorage() ` used to determine whether to support FsDatasetCache can't meet the requirements. Therefore, we add `isRAM()` and `isRAMStorage() ` methods to decide whether cache is supported or not. And the other functions, such as, Persistent, Quota, and Movable judged by`isTransient()` and `isTransientStorage() ` methods. ---------------------------------------------------------------- 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: us...@infra.apache.org Issue Time Tracking ------------------- Worklog Id: (was: 479050) Time Spent: 2h 50m (was: 2h 40m) > Applying NVDIMM storage media to HDFS > ------------------------------------- > > Key: HDFS-15025 > URL: https://issues.apache.org/jira/browse/HDFS-15025 > Project: Hadoop HDFS > Issue Type: New Feature > Components: datanode, hdfs > Reporter: YaYun Wang > Assignee: YaYun Wang > Priority: Major > Labels: pull-request-available > Attachments: Applying NVDIMM to HDFS.pdf, HDFS-15025.001.patch, > HDFS-15025.002.patch, HDFS-15025.003.patch, HDFS-15025.004.patch, > HDFS-15025.005.patch, HDFS-15025.006.patch, NVDIMM_patch(WIP).patch > > Time Spent: 2h 50m > Remaining Estimate: 0h > > The non-volatile memory NVDIMM is faster than SSD, it can be used > simultaneously with RAM, DISK, SSD. The data of HDFS stored directly on > NVDIMM can not only improves the response rate of HDFS, but also ensure the > reliability of the data. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org