Question / Problem

Certain operations in a CQ4/CQ5 authoring cluster (e.g. replication) are considerably slower when triggered from a slave cluster-node.

Answer / Resolution

The latency is caused by delays on the TCP layer: per default, small data packets are concatenated into bigger frames before actually sending them across the network to prevent network congestion. This has a negative performance impact on the TCP communication between the slave and master cluster-nodes and can be improved dramatically by setting the TCP_NODELAY flag on TCP connections. This causes every data packet to be transmitted immediately.

Attached to this article is CRX hotfix pack which causes the TCP connections used for cluster-communication between master and slave cluster-nodes to be opened with the TCP_NODELAY flag set.




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