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https://issues.apache.org/jira/browse/HDFS-14740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Feilong He updated HDFS-14740:
------------------------------
    Description: In HDFS-13762, persistent memory is enabled in HDFS 
centralized cache management. Even though persistent memory can hold cache data 
after node restarts, the cache data will be cleaned up after DataNode restarts 
for simplifying the implementation. We propose to improve HDFS persistent 
memory (PM) cache by taking advantage of PM's data persistence characteristic. 
i.e., recovering the cache status when DataNode restarts, thus, cache warm up 
time can be saved for user.

> HDFS read cache persistence support
> -----------------------------------
>
>                 Key: HDFS-14740
>                 URL: https://issues.apache.org/jira/browse/HDFS-14740
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Feilong He
>            Priority: Major
>
> In HDFS-13762, persistent memory is enabled in HDFS centralized cache 
> management. Even though persistent memory can hold cache data after node 
> restarts, the cache data will be cleaned up after DataNode restarts for 
> simplifying the implementation. We propose to improve HDFS persistent memory 
> (PM) cache by taking advantage of PM's data persistence characteristic. i.e., 
> recovering the cache status when DataNode restarts, thus, cache warm up time 
> can be saved for user.



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