If the debug / trace levels are disabled you can still observe heap used by some classes that should log information only when appropriate level is enabled. One of the most heap consuming is com.hybris.datahub.queue.PoolQueue.
SAP Data Hub 220.127.116.11 and higher
SAP Data Hub 6.4
SAP Data Hub 6.5
SAP Data Hub 6.6
KBA , CEC-COM-HUB , SAP Commerce Data Hub , How To
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