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https://issues.apache.org/jira/browse/HDFS-6581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14141474#comment-14141474
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Colin Patrick McCabe commented on HDFS-6581:
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bq. HDFS-4953 is not a subtask of HDFS-4949, and you yourself have said that it
is an independent change. Also no numbers were cited or provided as evidence
when calling the merge vote for HDFS-4949 so I don't think the community could
reasonably be expected to take that into consideration.
When HDFS-4953 was created, it was a subtask of HDFS-4949. It was moved out
because people wanted to be able to take advantage of it more quickly and it
was a valuable improvement even without HDFS-4949.
I don't think creating a usable eviction strategy is that hard. I can help
with it, but probably not for a few days.
The move from subversion to git has reduced a lot of the pain of maintaining a
branch. You just periodically do a "git rebase \-i trunk" and you're good to
go. This is once of the biggest advantages of moving to git and if you haven't
tried rebase \-i, you should!
Can you give a summary of which tasks you are planning on completing prior to
the merge and which after?
> 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: HDFS-6581.merge.01.patch, HDFS-6581.merge.02.patch,
> HDFS-6581.merge.03.patch, HDFS-6581.merge.04.patch, HDFS-6581.merge.05.patch,
> HDFS-6581.merge.06.patch, HDFS-6581.merge.07.patch,
> HDFSWriteableReplicasInMemory.pdf, Test-Plan-for-HDFS-6581-Memory-Storage.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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