java - Zookeeper in-memory log -

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does zookeeper have "in-memory log"? i've experience zookeeper never seen before (from client side), , after searching haven't found related in-memory log. far know, every operation (create, setdata, delete) made on disk.

however, in paper ravana: controller fault-tolerance in software-defined networking authors

event logging: master saves each event in zookeeper’s distributed in-memory log. slaves monitor log registering trigger it. when new event propagated slave’s log, trigger activated slave can read newly arrived event locally.

so, assuming there in-memory log, how (java) client app use it? or server side only?


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