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Red Hat JBoss xPaaS - When xPaaS meets DEVOPS - Part One

This is post is the content of one of the short session I spoked in Japan. and strictly just my opinion.

When I was a enterprise architect (long ago in Taiwan), I'm in-charge of several application in the company, we receive a large number of user requirements per month.  There were about 10 developers in my teams, every time we push out a release, we always deploy it on a testing environment. Depends on if we are busy, we often have many versions deployed on testing environment. But the process of going through to create one is really painful. The developer needs to wait few days for resource to create and properly configured. Worst is the amount of forms and estimation stats, configuration documentation the developers needs to fill in. And when the code has finally reaches the production, it's time for the operation team to worry. If, by any chance, something went wrong in the production, became operation's biggest nightmare. They need to figure out what was really happening, and try to resolve by calling developers, but we as the developer cannot alway fix the problem instantly without reproducing the problem.

The role of developer and operations are conflict by nature. The developer to create changes, and he/her job is to add or update new feature and function to the software, tried to be as agile as possible, so when ever they need to communicate with the operations, they get very frustrated as it seems to them, the operation team never have the courage to try anything new or even refuse to change. On the other-hands, operation thinks developers are irresponsible, they can never deliver a software that is 100% stable, their responsibility are to make sure the system is 24-7 online or at least  99.999999% of uptime, they are also responsible to enhance the service level, for that the way operation does their job needs to be static. The fight between two parties is going to result a tremendous drawback and hurt company at the end. (I have hold or participated in countless meetings just to resolve the problems between two teams, trust me, it's very painful..)

So when the concept of DEVOPS emerges, I though it brought a ray of light to this dark, but actually introducing it into the enterprise is surely very difficult. However, Red Hat JBoss xPaaS makes the perfect solution when it comes to DEVOPS.

My understanding of DEVOPS can be broken down into 3 main areas,

  • Self Service
  • Automation
  • Continuous Delivery 

I would like to talk a little about how Red Hat JBoss xPaaS help in these 3 Areas base from my understanding of the technology.

When xPaaS meets DEVOPS series:
Part One 
Part Two

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這個題目很多人叫我寫,可是這題目好大,這分明就是整死我咩~
所以我會分幾段慢慢寫。

JBoss 的 SubsystemDatasource WebWeb Service EJB Hibernate JMSJCAJVM 調校OS (作業系統)

先來看一下 DataSource Subsystem, DataSource 的部分主要是針對Connection Pool 做調校。

通常,程式都會需要跟資料庫界接,電腦在本機,尤其是在記憶體的運算很快,但是一旦要外部的資源連接,就是會非常的耗資源。所以現在的應用程式伺服器都會有個Pool 放一些先連接好的 資料庫connection,當程式有需要的時候就可以馬上提供,而不用花那些多餘的資源去連接資料庫。

這就是為什麼要針對Connection Pool 去做調校。

以下會討論到的參數,都是跟效能比較有關係,Datasource 還有很多參數,像是檢核connection 是否正確的,我都不會提到。如果你追求的是非常快速的效能,那我建議你一個檢核都不要加。當然,這樣就會為伺服器上面執行的程式帶來風險。這就是你要在效能與正確,安全性上面的取捨了。 (套句我朋友說的話,不可能又要馬兒好,又要馬兒不吃草的..)

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min-pool-size 

Connection Pool 最少會存留的connection 數量

max-pool-size 

Connection Pool 最多可以開啓的 connection 數量

prefill

事先將connection pool 裡面建立好min-pool-size 的connection.

我的建議是觀察一下平常程式要用到的量設定為 min-pool-size 。
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