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https://issues.apache.org/jira/browse/HDFS-5851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14046280#comment-14046280
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Andrew Purtell commented on HDFS-5851:
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bq. In term of discardability, what is the "eviction" policy for such data and
how control or fine tune it if needed.
Related, I was talking with [~cmccabe] in the context of HDFS-4949 about
possible LRU or LFU policy based eviction, and how that might work. Interesting
open question of how to revoke access to mapped pages shared by the datanode
with another process without causing the client process to segfault. I don't
see this issue addressed in the design doc on this issue. One possibility is a
callback protocol advising the client process of pending invalidations?
> Support memory as a storage medium
> ----------------------------------
>
> Key: HDFS-5851
> URL: https://issues.apache.org/jira/browse/HDFS-5851
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode
> Affects Versions: 3.0.0
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Attachments:
> SupportingMemoryStorageinHDFSPersistentandDiscardableMemory.pdf,
> SupportingMemoryStorageinHDFSPersistentandDiscardableMemory.pdf,
> SupportingMemoryStorageinHDFSPersistentandDiscardableMemory.pdf
>
>
> Memory can be used as a storage medium for smaller/transient files for fast
> write throughput.
> More information/design will be added later.
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