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https://issues.apache.org/jira/browse/HDFS-3912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13532493#comment-13532493
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Harsh J commented on HDFS-3912:
-------------------------------

bq. FYI: This patch is missing the branch-2 patch. After applying HDFS-3703 for 
branch-2, it's missing the DFS_NAMENODE_CHECK_STALE_DATANODE_DEFAULT settings, 
etc..

The diff may be dependent on the JIRA you mention, but perhaps not the patch 
itself. We merged the trunk commit directly into branch-2, as 
viewable/downloadable here: view at 
http://svn.apache.org/viewvc?view=revision&revision=1397219 and download at 
http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java?revision=1397219&view=co

If you use git locally, you can also add a remote and cherry-pick it out I 
guess.
                
> Detecting and avoiding stale datanodes for writing
> --------------------------------------------------
>
>                 Key: HDFS-3912
>                 URL: https://issues.apache.org/jira/browse/HDFS-3912
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: 3.0.0
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>             Fix For: 1.2.0, 2.0.3-alpha
>
>         Attachments: HDFS-3912.001.patch, HDFS-3912.002.patch, 
> HDFS-3912.003.patch, HDFS-3912.004.patch, HDFS-3912.005.patch, 
> HDFS-3912.006.patch, HDFS-3912.007.patch, HDFS-3912.008.patch, 
> HDFS-3912.009.patch, HDFS-3912-010.patch, HDFS-3912-branch-1.1-001.patch, 
> HDFS-3912-branch-1.patch, HDFS-3912.branch-1.patch
>
>
> 1. Make stale timeout adaptive to the number of nodes marked stale in the 
> cluster.
> 2. Consider having a separate configuration for write skipping the stale 
> nodes.

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