hadoop-common-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Botong Huang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15707) Add IsActiveServlet to be used for Load Balancers
Date Tue, 04 Sep 2018 19:37:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16603492#comment-16603492
] 

Botong Huang commented on HADOOP-15707:
---------------------------------------

Looks good to me overall. Only one small ask: can we change IsActiveServlet.PATH_SPEC to "/isactive"
to avoid upper/lower case confusion in the future? 

> 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.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

---------------------------------------------------------------------
To unsubscribe, e-mail: common-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: common-issues-help@hadoop.apache.org


Mime
View raw message