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Posted to common-issues@hadoop.apache.org by "Lukas Majercak (JIRA)" <ji...@apache.org> on 2018/08/30 22:07:00 UTC
[jira] [Comment Edited] (HADOOP-15707) Add IsActiveServlet to be
used for Load Balancers
[ https://issues.apache.org/jira/browse/HADOOP-15707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16597972#comment-16597972 ]
Lukas Majercak edited comment on HADOOP-15707 at 8/30/18 10:06 PM:
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Add -HADOOP-1570+7+-.002.patch for setting up IsRouterActiveServlet in RouterHttpServer
was (Author: lukmajercak):
Add HADOOP-15705.002.patch for setting up IsRouterActiveServlet in RouterHttpServer
> 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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