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https://issues.apache.org/jira/browse/HDFS-14740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16917589#comment-16917589
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Rui Mo commented on HDFS-14740:
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Fixed one checkstyle issue and refined unit test in [^HDFS-14740.002.patch].
> 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: Rui Mo
> Priority: Major
> Attachments: HDFS-14740.000.patch, HDFS-14740.001.patch,
> HDFS-14740.002.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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