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https://issues.apache.org/jira/browse/HDFS-6581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14106349#comment-14106349
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Colin Patrick McCabe commented on HDFS-6581:
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bq. If ramfs ate 90% of memory, would a YARN task die or instead just get their
heaps swapped?
Depends on how much memory 10% of memory is, whether swap is enabled, etc. etc.
The point I was trying to make is that if 90% of ram goes missing, you will
notice. Whereas if tmpfs starts swapping, you may not notice, unless you're
paying careful attention to performance. tmpfs doesn't have the predictability
that ramfs does.
> 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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