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JEAP 6&5 - 確定你的UDP環境

到一個客戶那裡,發現它cluster 怎樣都裝不起來,
因為我不是OS 的工程師,也不確定他們的網管是怎麼限制Policy的,
測試了一下,才發現是他們的UDP  這個Protocol 不work。
(因為JBoss Default Cluster 的機制是靠 UDP傳送的)。

要如何測試?
請先下載這個JAR檔,如果你是用EAP 5 , 那你其實可以在$JBOSS_HOME/server/production/lib下找到
(如果你是下載的,請記得把檔案的附檔名從.zip 改為.jar)

確定有這個jgroups.jar檔在你的執行目錄下之後
執行以下這段啟動接收者

java -cp jgroups.jar org.jgroups.tests.McastReceiverTest -mcast_addr 224.10.10.10 -port 5555
在另一個視窗,同一個路徑下執行發送者。
java -cp jgroups.jar org.jgroups.tests.McastSenderTest -mcast_addr 224.10.10.10 -port 5555
確定之後,在發送者打幾個字,接收者應該就可以收到了。

如果不行,因為原因有很多種,請洽網管或是管理OS主機人員研究拉!

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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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max-pool-size 

Connection Pool 最多可以開啓的 connection 數量

prefill

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