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https://issues.apache.org/jira/browse/HADOOP-15707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16598029#comment-16598029
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Íñigo Goiri edited comment on HADOOP-15707 at 8/30/18 11:12 PM:
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Thanks [~virajith] for the comments.
We have been using it for a couple weeks with our internal Load Balancers.
Today tested it in Azure VMSS and it seems to do the trick, this is the example
for how to set it for the RM:
{code}
az network lb probe create -g XXX --lb-name YYY -n RMProbe --protocol http
--port 8088 --path /isActive
{code}
was (Author: elgoiri):
Thanks [~virajith] for the comments.
We have been using it for a couple weeks with our internal Load Balancers.
Today we had tested it in Azure VMSS and it seems to do the trick, this is the
example for how to set it for the RM:
{code}
az network lb probe create -g XXX --lb-name YYY -n RMProbe --protocol http
--port 8088 --path /isActive
{code}
> 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.microsoft.com/en-us/azure/load-balancer/load-balancer-custom-probe-overview]
> Components in Hadoop (e.g., NN, RM, Router,...) should have a unified way to
> report if they are active.
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