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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 (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. (was: 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 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
> 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
>
>
> 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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