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https://issues.apache.org/jira/browse/HDFS-14355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16794924#comment-16794924
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Rakesh R commented on HDFS-14355:
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{quote}This property specifies the cache capactiy for both memory & pmem. We
kept same behavior upon the specified cache capacity for pmem cache as that for
memory cache.
{quote}
Please look at my above comment#8. As we know the existing code deals with only
the OS page cache, but now adding pmem as well and requires special
intelligence to manage the stats/overflows if we allow to plug in two entities
together. Just a quick thought is, to add new configuration
{{dfs.datanode.cache.pmem.capacity}} and reserve/release logic can be moved to
specific MappableBlockLoader's.
> Implement HDFS cache on SCM by using pure java mapped byte buffer
> -----------------------------------------------------------------
>
> Key: HDFS-14355
> URL: https://issues.apache.org/jira/browse/HDFS-14355
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: caching, datanode
> Reporter: Feilong He
> Assignee: Feilong He
> Priority: Major
> Attachments: HDFS-14355.000.patch, HDFS-14355.001.patch,
> HDFS-14355.002.patch
>
>
> This task is to implement the caching to persistent memory using pure
> {{java.nio.MappedByteBuffer}}, which could be useful in case native support
> isn't available or convenient in some environments or platforms.
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