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https://issues.apache.org/jira/browse/HDFS-14355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16794759#comment-16794759
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Feilong He commented on HDFS-14355:
-----------------------------------
Hi [~rakeshr], I just noted that the following piece of code you mentioned is
required actually. 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. The default value is 0, which will disable HDFS cache on
memory or pmem. It seems quite reasonable. Thanks!
{code:java}
myConf.setLong(DFSConfigKeys.DFS_DATANODE_MAX_LOCKED_MEMORY_KEY,
CACHE_CAPACITY);{code}
> 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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