[HDFS-15337] Support available space choosing policy in HDFS Persistent Memory Cache

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: caching, datanode
• Target Version/s: 3.5.0
• Assignee: Feilong He
• Reporter: Feilong He
• Created: 06/May/20 07:44
• Updated: 04/Jan/24 08:13

Description

In HDFS-13762, we introduced HDFS Persistent Memory Cache feature. In that implementation, if more than one persistent memory volume is specified by user, a simple round-robin policy is used to pick up a volume to cache data. Evidently, the large difference of volume capacity can lead to imbalance issue.