Hello,
gcache.size constrains the total size of replication events that a node
keeps on disk in case it needs to provide those events to other nodes that
have temporarily dropped from the cluster, the so called IST, Incremental
State Transfer.
gcs.recv_q_hard_limit constrains the total size of incoming replication
events a node will keep while it is undergoing a full database transfer, the
so called SST , State Snapshot Transfer. While a node is fetching the entire
database from another node, new transactions will keep arriving and the node
needs to store them until the SST is complete.
gcs.fc_limit defines the number of transactions a node is allowed to fall
behind before the flow control mechanism kicks in and the entire cluster is
throttled until the node can catch up.
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