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"Disconnecting lagging nodes"; "Disconnecting node N because it has exceeded MaxBufferedEpochs (100 >= 100), epoch N/N" (Doc ID 2985376.1)

Last updated on MAY 13, 2024

Applies to:

MySQL NDB Cluster - Version 8.0 and later
Information in this document applies to any platform.


An SQL node is occasionally  disconnected from data nodes with messages in the cluster log like below:

 When an SQL node is disconnected from the cluster, the LOST_EVENTS event is generated as described in <Document 1024297.1>.


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In this Document
 Use fast network
 Keep transactions small
 Do not enable binary logging for NDB on too many SQL nodes
 Use dedicated SQL nodes
 Increase MaxBufferedEpochs, and MaxBufferedEpochBytes

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