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https://issues.apache.org/jira/browse/HDFS-14355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16800445#comment-16800445
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Sammi Chen commented on HDFS-14355:
-----------------------------------
Thanks [~PhiloHe] for working on it. Several quick comments,
1. User would like to know the relationship between
dfs.datanode.cache.pmem.capacity and dfs.datanode.max.locked.memory by reading
the descriptions in hdfs-default.xml
2. PmemUsedBytesCount, is there any forsee issue to reuse UsedBytesCount
instead? Also byte roundup is not addressed in PmemUsedBytesCount
3. FsDatasetCached is not a good place to put specific memory loader
implemetation functions like reservePmem, releasePmem. FsDatasetCached should
be generic.
4. As [~daryn] suggested, more elegant error handling
> 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, HDFS-14355.003.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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