Rui Mo updated HDFS-14740:
    Attachment: HDFS-14740.006.patch

> HDFS read cache persistence support
> -----------------------------------
>                 Key: HDFS-14740
>                 URL: https://issues.apache.org/jira/browse/HDFS-14740
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: caching, datanode
>            Reporter: Feilong He
>            Assignee: Rui Mo
>            Priority: Major
>         Attachments: HDFS-14740.000.patch, HDFS-14740.001.patch, 
> HDFS-14740.002.patch, HDFS-14740.003.patch, HDFS-14740.004.patch, 
> HDFS-14740.005.patch, HDFS-14740.006.patch
> 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.

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