[HDFS-17012] Remove unused DFSConfigKeys#DFS_DATANODE_PMEM_CACHE_DIRS_DEFAULT

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.3.4
• Fix Version/s: 3.4.0
• Component/s: datanode, hdfs
• Hadoop Flags: Reviewed
• Assignee: JiangHua Zhu
• Reporter: JiangHua Zhu
• Created: 15/May/23 07:10
• Updated: 18/May/23 08:57
• Resolved: 18/May/23 08:57

Description

In DFSConfigKeys, DFS_DATANODE_PMEM_CACHE_DIRS_DEFAULT doesn't seem to have been used anywhere, this is a redundant option and we should remove it.

Issue Links

• is related to: HDFS-14740 Recover data blocks from persistent memory read cache during datanode restarts
• links to: GitHub Pull Request #5659