[GitHub] [hadoop-ozone] elek commented on issue #710: HDDS-3173. Provide better default JVM options

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elek commented on issue #710: HDDS-3173. Provide better default JVM options
URL: https://github.com/apache/hadoop-ozone/pull/710#issuecomment-603768420
 
 
   > It would be better to restrict the regex to something which is more close to GC stuff, like something that matches to GC case insensitive after a -XX but before a space... though I am unsure whether there is an ultimate solution for this, and maybe it is better to just document the suggested parameters for different jre versions, but we certainly should add some documentation on the potential behavioural change in case of JVM tuning somewhere.
   
   Thanks the feedback. Yes, there is no ultimate solution. I considered to do some smarter pattern (like the one what you suggested), but that one is more dangerous: It's hard to detect all the GC related parameters (including G1, CMS, etc.). I am not sure if we have one generic prefix for all of them.
   
   And these settings just for the first time user. Vendors with custom distribution provides adjusted values. Real production clusters might have adjusted values.
   
   The goal here is to provide a reasonable default for first time users (who download Ozone to try it out) but enable full customization (without surprises) for the advanced users.
   
   > Also we talk about DataNodes where the problem happened, but the change seems to affect all daemonizable process types.
   
   I thinks it's a generic problem that JVM has a very conservative default. I can reproduce the problem with Datanode but as it's related to the retry cache in ratis, OM is affected immediately. And I think all the settings are useful for any server side component. 

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