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From "Bill Bell (JIRA)" <j...@apache.org>
Subject [jira] Updated: (SOLR-2044) Replication ping.jsp page for use with Amazon EC2 and Multiple Cores
Date Fri, 13 Aug 2010 03:49:18 GMT

     [ https://issues.apache.org/jira/browse/SOLR-2044?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bill Bell updated SOLR-2044:
----------------------------

    Attachment: ping.jsp

1.4.x file to ad to solr.war 

> Replication ping.jsp page for use with Amazon EC2 and Multiple Cores
> --------------------------------------------------------------------
>
>                 Key: SOLR-2044
>                 URL: https://issues.apache.org/jira/browse/SOLR-2044
>             Project: Solr
>          Issue Type: Bug
>          Components: replication (java)
>    Affects Versions: 1.4.1
>            Reporter: Bill Bell
>             Fix For: 1.4.2
>
>         Attachments: ping.jsp
>
>
> When hosting SOLR at Amazon there is an issue with load balancing and replication. This
is especially useful when you are using multiple slaves behind
> the load balancer and a MASTER SOLR box. The Load Balancer at Amazon has no way of knowing
that each SLAVE has data from the MASTER replicated. As soon as the instance starts, 
> Amazon starts sending requests to the Slaves. You need to have the Slave running in order
to get the files from the Master.
> The solution is to add a ping.jsp page that Amazon hits on the Slave Tomcat/Jetty instances.
The ping.jsp checks all cores to make sure they all have data, otherwise it returns a non-200
values which signals Amazon
> to not send requests to the Slaves.
> Put this into your solr.war file as /admin/replication/ping.jsp

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