Skip to main content

Using Amazon SQS for Out-Scaled Deployers

Image
By
When a Deployer Receiver receives a transport package, it notifies the Deployer Workers there is 'work' for them to do. This notification can take the form of JMS messages sent using some kinds of queuing mechanism. This post describes the Amazon Simple Queuing Service (SQS) to send these notifications. The Deployer workers receive these messages from SQS and they start deploying/undeploying the package.

In order to setup this notification system, we must first create the SQS queues and configure them across the Deployer Receiver and all Deployer Workers.

Start by creating Standard Queues using all default properties. We need 3 queues (commit, content, and prepare):



Once the SQS queues are in place, we can configure the Deployers to use them in the file deployer-config.xml. Amazon gives us the queues URLs. We need to specify the URL base separately, and then simply name the queues individually, as per below:

<Queues>
    <Queue Default="true" Verbs="Content" Adapter="JMS" Id="mihai-content">
        <Property Name="Workers" Value="16"/>
    </Queue>
    <Queue Verbs="Commit,Rollback" Adapter="JMS" Id="mihai-commit">
        <Property Name="Workers" Value="16"/>
    </Queue>
    <Queue Verbs="Prepare" Adapter="JMS" Id="mihai-prepare">
        <Property Name="Workers" Value="16"/>
    </Queue>

    <Adapter Id="JMS">
        <Property Name="JMSConnectionFactoryBuilderClass"
                  Value="com.sdl.delivery.spring.configuration.jms.AmazonSQSConnectionFactoryBuilder"/>
        <Property Name="JMSUri" Value="https://sqs.eu-west-1.amazonaws.com/692321"/>
        <Property Name="Username" Value="username"/>
        <Property Name="Password" Value="password"/>
        <Property Name="ReceiveTimeout" Value="200"/>
    </Adapter>
</Queues>

The properties Username and Password represent the AWS account credentials and they can be found in AWS user security settings.

The property Workers specifies the number of worker threads for each queue. Values that perform best are around 10-20 worker threads. Performance degrades using lower values and there isn't any significant performance gain when using higher values.



Labels:

Comments

Post a Comment

Popular posts from this blog

Running sp_updatestats on AWS RDS database

By
Part of the maintenance tasks that I perform on a MSSQL Content Manager database is to run stored procedure sp_updatestats . exec sp_updatestats However, that is not supported on an AWS RDS instance. The error message below indicates that only the sa  account can perform this: Msg 15247 , Level 16 , State 1 , Procedure sp_updatestats, Line 15 [Batch Start Line 0 ] User does not have permission to perform this action. Instead there are several posts that suggest using UPDATE STATISTICS instead: https://dba.stackexchange.com/questions/145982/sp-updatestats-vs-update-statistics I stumbled upon the following post from 2008 (!!!), https://social.msdn.microsoft.com/Forums/sqlserver/en-US/186e3db0-fe37-4c31-b017-8e7c24d19697/spupdatestats-fails-to-run-with-permission-error-under-dbopriveleged-user , which describes a way to wrap the call to sp_updatestats and execute it under a different user: create procedure dbo.sp_updstats with execute as 'dbo' as...
2 comments
Read more

REL Standard Tag Library

By
The RSTL is a library of REL tags providing standard functionality such as iterating collections, conditionals, imports, assignments, XML XSLT transformations, formatting dates, etc. RSTL distributable is available on my Google Code page under  REL Standard Tag Library . Always use the latest JAR . This post describes each RSTL tag in the library explaining its functionality, attributes and providing examples. For understanding the way expressions are evaluated, please read my post about the  Expression Language used by REL Standard Tag Library . <c:choose> / <c:when> / <c:otherwise> Syntax:     <c:choose>         <c:when test="expr1">             Do something         </c:when>         <c:when test="expr2">             Do something else         </c:when...
2 comments
Read more

Publish Binaries to Mapped Structure Groups

By Unknown
Today's TBB of the Week comes from the high demand in the field to publish binary assets to different mapped Structure Groups. By default SDL Tridion offers two ways of publishing binaries: All binaries publish to a folder defined in your Publication properties; All binaries rendered by a given template publish to a folder corresponding to a given Structure Group; In my view, both cases are terrible, over-simplified and not representing a real use-case. Nobody in the field wants all binaries in one folder and nobody separates binary locations by template. Instead, everybody wants a mapping mechanism that takes a binary and publishes it to a given folder, defined by a Structure Group, and this mapping is done using some kind of metadata. More often than not, the metadata is the TCM Folder location of the Multimedia Component. I have seen this implemented numerous times. So the solution to publish binaries to a given location implies finding a mapping from a TCM Folder to a...
10 comments
Read more