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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:
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    Description: In HDFS-13762, persistent memory is enabled in HDFS 
centralized cache management. Even though persistent memory can persist cache 
data, for simplifying the implementation, the cache data will be cleaned up 
after DataNode restarts. 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.  (was: 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 persist cache data, for 
> simplifying the implementation, the cache data will be cleaned up after 
> DataNode restarts. 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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