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From Íñigo Goiri (JIRA) <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15707) Add IsActiveServlet to be used for Load Balancers
Date Fri, 31 Aug 2018 16:55:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16599012#comment-16599012

Íñigo Goiri commented on HADOOP-15707:

A minor nit, there is an extra space in the second link and the parenthesis.
I think markdown will show it weirdly.
Other than that +1.

> 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 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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