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https://issues.apache.org/jira/browse/HDFS-6581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14106203#comment-14106203
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Gopal V commented on HDFS-6581:
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Swap in modern kernels are checksummed with crc32c.
Re: RAMfs, the [tmpfs] mediatype applies to anything which shows up as a
directory. Perhaps a rename would make it clearer.
This approach allows someone who wants to mount some other kind of volatile
storage (or even a real "ramdisk").
> Write to single replica in memory
> ---------------------------------
>
> Key: HDFS-6581
> URL: https://issues.apache.org/jira/browse/HDFS-6581
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Attachments: HDFSWriteableReplicasInMemory.pdf
>
>
> Per discussion with the community on HDFS-5851, we will implement writing to
> a single replica in DN memory via DataTransferProtocol.
> This avoids some of the issues with short-circuit writes, which we can
> revisit at a later time.
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