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https://issues.apache.org/jira/browse/HDFS-6581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14183404#comment-14183404
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Hudson commented on HDFS-6581:
------------------------------

FAILURE: Integrated in Hadoop-trunk-Commit #6338 (See 
[https://builds.apache.org/job/Hadoop-trunk-Commit/6338/])
HDFS-6988. Improve HDFS-6581 eviction configuration (Xiaoyu Yao via Colin P. 
McCabe) (cmccabe: rev a52eb4bc5fb21574859f779001ea9d95bf5207fe)
* 
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestLazyPersistFiles.java
* 
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/balancer/TestBalancer.java
* 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java


> Write to single replica in memory
> ---------------------------------
>
>                 Key: HDFS-6581
>                 URL: https://issues.apache.org/jira/browse/HDFS-6581
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: datanode, hdfs-client, namenode
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>             Fix For: 2.6.0
>
>         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, HDFS-6581.merge.08.patch, 
> HDFS-6581.merge.09.patch, HDFS-6581.merge.10.patch, HDFS-6581.merge.11.patch, 
> HDFS-6581.merge.12.patch, HDFS-6581.merge.14.patch, HDFS-6581.merge.15.patch, 
> HDFSWriteableReplicasInMemory.pdf, 
> Test-Plan-for-HDFS-6581-Memory-Storage.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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