Details
Description
In HDFS-13762, persistent memory (PM) is enabled in HDFS centralized cache management. Even though PM can persist cache data, for simplifying the initial implementation, the previous cache data will be cleaned up during DataNode restarts. Here, we are proposing to improve HDFS PM cache by taking advantage of PM's data persistence characteristic, i.e., recovering the status for cached data, if any, when DataNode restarts, thus, cache warm up time can be saved for user.
Attachments
Attachments
Issue Links
- is related to
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HDFS-15788 Correct the statement for pmem cache to reflect cache persistence support
- Resolved
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HDFS-13762 Support non-volatile storage class memory(SCM) in HDFS cache directives
- Resolved
- relates to
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HDFS-17012 Remove unused DFSConfigKeys#DFS_DATANODE_PMEM_CACHE_DIRS_DEFAULT
- Resolved