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Rob_Jago Member since 2015 41 posts
Rulesware
Posted: 4 years ago
Last activity: 2 years 6 months ago
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More details on Elastic Search in multi node environment when the primary search node is shutdown/crashes

Hi,

I am trying to find out more information about how Pega (7.1.8) and ElasticSearch work together when the primary search node (for ElasticSearch) in a multi-node environment (with a load balancer in front) goes down for one of the following scenarios:

1. it's taken offline during a migration of code, hotfix, pega upgrade, OS patches, etc.. planned offline/outage (say 1 hour at most)

2. it unexpected crashes overnight and is unavailable for hours

So, with the following scenarios above:

1. How does the searching supposed to work on node 2+ when this occurs; is this just adding the multiple nodes to the search list?

2. Does the environment re-elect a primary search node ? or does it wait until the primary comes back online? What happens if a new node has been built to replace the node that crashed (and hence, a new node ID ) which would mean the original primary search node will never be re-added back to the node list..

3. My fear is that there is manual intervention required (in particular item 2). Please ensure me there's no manual intervention required!

thank you

Rob

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