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https://issues.apache.org/jira/browse/HDFS-14740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16958560#comment-16958560
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Rui Mo commented on HDFS-14740:
-------------------------------
In [^HDFS-14740.006.patch]:
Added unit test for uncaching the restored files from PM.
> 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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