Question

Index JVM Restart will this be sufficient ?

Hello,

Can we do cache clear restart only index JVM, after installing a hotfix( Pega recommends to do cache clear and restart) ? How necessary is it to restart all JVM’s?

Why do we have to restart all JVM’s?

Thank you, Saritha

***Edited by Moderator Marissa to move from Pega Academy to Pega Support Community; update platform capability tags***

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September 20, 2019 - 1:07pm

Hi Saritha,
It depends. Clearing cache should only be done if there are specific instructions for a particular hot fix to clear any caches.
In the case of there being an update to a java class (as an example something in the Pega runtime engine) then a restart of all nodes is required because the java class loaded happens one time at startup. 
In the case of there being only rules in a hot fix, then a restart should not be needed. The rule changes are propagated across the cluster and should be available on all nodes.
In the case of a mixed rules and java classes, you must also restart all nodes so that rules dependent on class updates are in sync with the loaded java classes.
Hope this helps.
JIm