As a result of the cache changes in version 6.1.4, the cache settings you used in 6.1.3 may or may not be the most appropriate settings in 6.1.4. After upgrading to 6.1.4, you should tune the cache setting --cmem and check the resulting performance to ensure the Dgraph cache performs as expected.

For guidance, see "Cache-tuning recommendations for optimizing performance" in the MDEX Engine Performance Tuning Guide.