本篇文章給大家分享的是有關(guān)SAP Hybris和Netweaver的集群模式以及集群模式下工作需要解決的問(wèn)題是什么，小編覺(jué)得挺實(shí)用的，因此分享給大家學(xué)習(xí)，希望大家閱讀完這篇文章后可以有所收獲，話不多說(shuō)，跟著小編一起來(lái)看看吧。

成都創(chuàng)新互聯(lián)服務(wù)項(xiàng)目包括泌陽(yáng)網(wǎng)站建設(shè)、泌陽(yáng)網(wǎng)站制作、泌陽(yáng)網(wǎng)頁(yè)制作以及泌陽(yáng)網(wǎng)絡(luò)營(yíng)銷策劃等。多年來(lái)，我們專注于互聯(lián)網(wǎng)行業(yè)，利用自身積累的技術(shù)優(yōu)勢(shì)、行業(yè)經(jīng)驗(yàn)、深度合作伙伴關(guān)系等，向廣大中小型企業(yè)、政府機(jī)構(gòu)等提供互聯(lián)網(wǎng)行業(yè)的解決方案，泌陽(yáng)網(wǎng)站推廣取得了明顯的社會(huì)效益與經(jīng)濟(jì)效益。目前，我們服務(wù)的客戶以成都為中心已經(jīng)輻射到泌陽(yáng)省份的部分城市，未來(lái)相信會(huì)繼續(xù)擴(kuò)大服務(wù)區(qū)域并繼續(xù)獲得客戶的支持與信任！

Hybris支持cluster mode的部署，不同節(jié)點(diǎn)間通過(guò)局域網(wǎng)使用UDP進(jìn)行通信。

而SAP Netweaver經(jīng)典的3層layer里就提到Application layer也支持multiple node:

比如在AG3用tcode SM53查看，發(fā)現(xiàn)其是由3個(gè)node組成：

Cache invalidation

無(wú)論Hybris，還是Netweaver，都面臨一個(gè)需要解決的問(wèn)題，即cache / buffer invalidation.

# Cache Invalidation Concept in Hybris

The core of a Hybris Cluster is a network communication system that makes sure the cache of each individual cluster member only holds valid data. The nodes in the Hybris Cluster communicate using TCP (JGroups) or UDP, by sending signals to other nodes that mark some cache entries as invalid because a database item has been changed. The following is the overview of the cache invalidation process:

(1) A description of a product has changed. Therefore, all cache entries referring to the product are invalid.

(2) A cluster node where the modification has been done sends a notification to all cluster nodes that all cache entries holding the product are invalid.

(3) Nodes that hold the product in their cache discard the cached data of the product and re-retrieve the product from the database the next time the product is used.

node之間用于通知cache invalidation的協(xié)議有UDP Multicast, UDP Unicast, or JGroups.各有優(yōu)缺點(diǎn)：

(1) JGroups provides the fastest communication and can be used both in the cloud for testing purposes and in a LAN or WAN network.

(2) UDP Multicast has some limitations in that some routers do not allow multicast network traffic by default. Amazon Elastic Compute Cloud (Amazon EC2) does not work using UDP, either.

# Cache Invalidation Concept in Netweaver

SAP help上分了13個(gè)步驟詳細(xì)講解：

by default cluster mode is deactivated. See startup log:

cloud foundry也支持分布式部署，節(jié)點(diǎn)之間通過(guò)消息通信。通過(guò)組件NATS實(shí)現(xiàn)

在安裝時(shí)也能觀察到：

NATS是CF啟動(dòng)時(shí)需要執(zhí)行的5個(gè)process之一：

以上就是SAP Hybris和Netweaver的集群模式以及集群模式下工作需要解決的問(wèn)題是什么，小編相信有部分知識(shí)點(diǎn)可能是我們?nèi)粘９ぷ鲿?huì)見(jiàn)到或用到的。希望你能通過(guò)這篇文章學(xué)到更多知識(shí)。更多詳情敬請(qǐng)關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。