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

A DD4T.net Implementation - Custom Binary Publisher

By
The default way to publish binaries in DD4T is implemented in class DD4T.Templates.Base.Utils.BinaryPublisher and uses method RenderedItem.AddBinary(Component) . This produces binaries that have their TCM URI as suffix in their filename. In my recent project, we had a requirement that binary file names should be clean (without the TCM URI suffix). Therefore, it was time to modify the way DD4T was publishing binaries. The method in charge with publishing binaries is called PublishItem and is defined in class BinaryPublisher . I therefore extended the BinaryPublisher and overrode method PublishItem. public class CustomBinaryPublisher : BinaryPublisher { private Template currentTemplate; private TcmUri structureGroupUri; In its simplest form, method PublishItem just takes the item and passes it to the AddBinary. In order to accomplish the requirement, we must specify a filename while publishing. This is the file name part of the binary path of Component.BinaryConten
1 comment
Read more

Event System to Create Mapped Structure Groups for Binary Publish

By Unknown
As a continuation of last week's Publish Binaries to Mapped Structure Group , this week's TBB is in fact the Event System part of that solution. Make sure you do check out the previous post first, which explains why and what this Event System does. To reiterate, the Event System intercepts a Multimedia Component save, take its Folder path and create a 1-to-1 mapping of Structure Groups. The original code was written, again, by my colleague Eric Huiza : [ TcmExtension ( "MyEvents" )] public class EventsManager  : TcmExtension {     private Configuration configuration;     private readonly Regex SAFE_DIRNAME_REGEX = new Regex ( @"[\W_]+" );     public EventsManager() {         ExeConfigurationFileMap fileMap = new ExeConfigurationFileMap ();         fileMap.ExeConfigFilename = Path .GetDirectoryName( Assembly .GetExecutingAssembly().Location) + "\\EventSystem.config" ;         configuration = ConfigurationManager
Post a Comment
Read more

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
1 comment
Read more