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Posted to hdfs-issues@hadoop.apache.org by "Feilong He (JIRA)" <ji...@apache.org> on 2019/08/16 07:54:00 UTC

[jira] [Commented] (HDFS-14740) HDFS read cache persistence support

    [ https://issues.apache.org/jira/browse/HDFS-14740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16908828#comment-16908828 ] 

Feilong He commented on HDFS-14740:
-----------------------------------

An initial patch has been uploaded, contributed by Mo Rui.

> 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
>            Assignee: Feilong He
>            Priority: Major
>         Attachments: HDFS-14740.000.patch
>
>
> 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 previous cache data will be cleaned up during 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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