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https://issues.apache.org/jira/browse/HADOOP-15707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16603440#comment-16603440
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Lukas Majercak commented on HADOOP-15707:
-----------------------------------------
Patch004 to fix checkstyle
> 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
> 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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