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https://issues.apache.org/jira/browse/HADOOP-15707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16604741#comment-16604741
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Hudson commented on HADOOP-15707:
---------------------------------
FAILURE: Integrated in Jenkins build Hadoop-trunk-Commit #14883 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/14883/])
HADOOP-15707. Add IsActiveServlet to be used for Load Balancers. (gifuma: rev
9af96d4ed4b6f80d3ca53a2b003d2ef768650dd4)
* (add)
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/http/TestIsActiveServlet.java
* (add)
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/IsRouterActiveServlet.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeHttpServer.java
* (add)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/IsResourceManagerActiveServlet.java
* (add)
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/IsNameNodeActiveServlet.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSHighAvailabilityWithQJM.md
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMWebAppFilter.java
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ResourceManager.java
* (add)
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/IsActiveServlet.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs-rbf/src/site/markdown/HDFSRouterFederation.md
* (edit)
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterHttpServer.java
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/ResourceManagerHA.md
> Add IsActiveServlet to be used for Load Balancers
> -------------------------------------------------
>
> Key: HADOOP-15707
> URL: https://issues.apache.org/jira/browse/HADOOP-15707
> Project: Hadoop Common
> Issue Type: New Feature
> Components: common
> Reporter: Lukas Majercak
> Assignee: Lukas Majercak
> Priority: Major
> Fix For: 3.2.0
>
> Attachments: HADOOP-15707.000.patch, HADOOP-15707.001.patch,
> HADOOP-15707.002.patch, HADOOP-15707.003.patch, HADOOP-15707.004.patch
>
>
> Hadoop has a few services with HA setups and it is common to set them behind
> Load Balancers.
> We should add a way for the Load Balancers to understand what should be the
> UI to show.
> For example, the standby RM just redirects the requests to the active RM.
> However, if both RMs are behind a Load Balancer the IP might not be reachable.
> Most Load balancers have probes to check if a server reports HTTP code 200:
> *
> [Azure|https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-custom-probe-overview]
> *
> [AWS|https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-healthchecks.html]
> Components in Hadoop (e.g., NN, RM, Router,...) should have a unified way to
> report if they are active.
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