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https://issues.apache.org/jira/browse/HDFS-14118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775971#comment-16775971
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Hudson commented on HDFS-14118:
-------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #16037 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/16037/])
HDFS-14118. Support using DNS to resolve nameservices to IP addresses. (yzhang:
rev f7a27cdee4e6829ebea4ea965e549a27acbf4310)
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
* (edit)
hadoop-hdfs-project/hadoop-hdfs-client/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestConfiguredFailoverProxyProvider.java
* (add)
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestMockDomainNameResolver.java
* (add)
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/DomainNameResolverFactory.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/HdfsClientConfigKeys.java
* (add)
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/DomainNameResolver.java
* (add)
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/DNSDomainNameResolver.java
* (add)
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/MockDomainNameResolver.java
* (delete)
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/package.html
* (edit)
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeys.java
* (add)
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/package-info.java
* (edit) hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
* (edit)
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.java
> Support using DNS to resolve nameservices to IP addresses
> ---------------------------------------------------------
>
> Key: HDFS-14118
> URL: https://issues.apache.org/jira/browse/HDFS-14118
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Fengnan Li
> Assignee: Fengnan Li
> Priority: Major
> Attachments: DNS testing log, HDFS design doc_ Single domain name for
> clients - Google Docs-1.pdf, HDFS design doc_ Single domain name for clients
> - Google Docs.pdf, HDFS-14118.001.patch, HDFS-14118.002.patch,
> HDFS-14118.003.patch, HDFS-14118.004.patch, HDFS-14118.005.patch,
> HDFS-14118.006.patch, HDFS-14118.007.patch, HDFS-14118.008.patch,
> HDFS-14118.009.patch, HDFS-14118.010.patch, HDFS-14118.011.patch,
> HDFS-14118.012.patch, HDFS-14118.013.patch, HDFS-14118.014.patch,
> HDFS-14118.015.patch, HDFS-14118.016.patch, HDFS-14118.017.patch,
> HDFS-14118.018.patch, HDFS-14118.019.patch, HDFS-14118.020.patch,
> HDFS-14118.021.patch, HDFS-14118.022.patch, HDFS-14118.023.patch,
> HDFS-14118.024.patch, HDFS-14118.patch
>
>
> In router based federation (RBF), clients will need to know about routers to
> talk to the HDFS cluster (obviously), and having routers updating
> (adding/removing) will have to make config change in every client, which is a
> painful process.
> DNS can be used here to resolve the single domain name clients knows to a
> list of routers in the current config. However, DNS won't be able to consider
> only resolving to the working router based on certain health thresholds.
> There are some ways about how this can be solved. One way is to have a
> separate script to regularly check the status of the router and update the
> DNS records if a router fails the health thresholds. In this way, security
> might be carefully considered for this way. Another way is to have the client
> do the normal connecting/failover after they get the list of routers, which
> requires the change of current failover proxy provider.
> See the attached design document for details about the proposed solution.
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