Changes for page Retention Policy

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• Page properties (1 modified, 0 added, 0 removed)

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27	27	** Cleanup Policy
28	28	** These three items determine the retention policy
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30		-As we learned in the introductory [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Event Streaming.crashcourse-eventstreaming-event-streaming-introduction||target="blank"]], the topic holds a log with a sequence of messages. Based on several criteria, the broker decides when to remove messages from the back of the log to ensure that the topic stays within specific parameters. These parameters are the retention hours and the retention bytes. If you want to learn more about them specifically, please check out this [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Event Streaming.crashcourse-eventstreaming-topic-and-topic-properties||target="blank"]].
	30	+As we learned in the [[introductory microlearning>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Event Streaming.crashcourse-eventstreaming-event-streaming-introduction||target="blank"]], the topic holds a log with a sequence of messages. Based on several criteria, the broker decides when to remove messages from the back of the log to ensure that the topic stays within specific parameters. These parameters are the retention hours and the retention bytes. If you want to learn more about them specifically, please check out this [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Event Streaming.crashcourse-eventstreaming-topic-and-topic-properties||target="blank"]].
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32	32	These parameters combined with the cleanup policy determine what happens with a message after it is expired. There are two options available:
33	33	* delete
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38	38	{{info}}The cleanup policy <compact> is not used in eMagiz.{{/info}}
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40		-The three aspects combine to make up the retention policy. Defining the correct values for both the retention hours and the retention bytes is a science as a form of art. As you only have limited storage capacity available, the challenge becomes how much retention you reserve per topic. The more you assign, the less free storage capacity remains for other topics. As a consequence, you need to strive to optimize your retention policy per topic continually.
	40	+These three aspects above combine to make up the retention policy. Defining the correct values for both the retention hours and the retention bytes is a science as a form of art. As you only have limited storage capacity available, the challenge becomes how much retention you reserve per topic. The more you assign, the less free storage capacity remains for other topics. As a consequence, you need to strive to optimize your retention policy per topic continually.
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42	42	== 4. Key takeaways ==
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