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This trio of hosts are configured to operate as replica sets with one primary and (2) read-only replica sets. The primary goal of clustering here is for high-availability(HA), as the hosts vote for quorum on which host will serve as the master. Connection strings to this cluster should include all or a majority of nodes so that the HA functionality works as intended.


Troubleshooting:

siomongo1 was down for a few days, and it was too out-of-sync to rejoin the cluster. To fix this, remove all files from the database directory, /data/db and restart the mongod service. This will put the node into STARTUP & STARTUP2 status. Eventually, the node will rebuild, and be promoted to SECONDARY status


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cqllabel in ( "peopledb" , "high-availability" , "ha" , "mongo" , "nosql" , "database" , "cluster" , "peopledb3" , "replication" , "mongodb" ) and type = "page" and space = "SD"
labelspeopledb peopledb3 mongo mongodb nosql database cluster replication ha high-availability

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