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https://issues.apache.org/jira/browse/HDFS-5851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14016877#comment-14016877
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Ali Ghodsi commented on HDFS-5851:
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[~sanjay.radia] Sanjay, Tachyon indeed has had discardability since about a
year back. In fact, the lineage support was only put in in the latest version.
In fact, Spark's current releases use Tachyon without lineage stored in
Tachyon. If data falls out of Tachyon, Spark will recompute it. Please update
the design doc accordingly. Thanks.
> Support memory as a storage medium
> ----------------------------------
>
> Key: HDFS-5851
> URL: https://issues.apache.org/jira/browse/HDFS-5851
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Affects Versions: 3.0.0
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Attachments:
> 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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