e90e091b_Apache_Kafka__Description
[Property] log.flush.interval.messages [Default] Long.MaxValue [Description] 
The number of messages written to a log partition before we force an fsync on the log. Setting this lower will sync data to disk more often but will have a major impact on performance. We generally recommend that people make use of replication for durability rather than depending on single-server fsync, however this setting can be used to be extra certain.
Apache Kafka
Description