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https://issues.apache.org/jira/browse/HDFS-5891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13900327#comment-13900327
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Hudson commented on HDFS-5891:
------------------------------
FAILURE: Integrated in Hadoop-Hdfs-trunk #1672 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1672/])
HDFS-5891. webhdfs should not try connecting the DN during redirection.
Contributed by Haohui Mai (brandonli:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1567810)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/JspHelper.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/web/resources/TestWebHdfsDataLocality.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestHttpsFileSystem.java
> webhdfs should not try connecting the DN during redirection
> -----------------------------------------------------------
>
> Key: HDFS-5891
> URL: https://issues.apache.org/jira/browse/HDFS-5891
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode, webhdfs
> Reporter: Haohui Mai
> Assignee: Haohui Mai
> Fix For: 2.4.0
>
> Attachments: HDFS-5891.000.patch, HDFS-5891.001.patch
>
>
> When the webhdfs server in NN serves an {{OPEN}} request, the NN will
> eventually redirect the request to a DN. The current implementation intends
> to choose the active DNs. The code always connects to the DN in a
> deterministic order to see whether it is active during redirection.
> Although it reduces the chance of the client from connecting to a failed DN,
> this is problematic because:
> # It has no guarantees that the client can connect to that DN even if the NN
> can connect to it.
> # It requires an additional network round-trip for every {{OPEN}} /
> {{CREATE}} request.
> This jira proposes that the NN should choose the DN based on the information
> of the data node manager.
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