Timer timer() {
        return timer;
    }
Apply acquisition lock to acquired records.

@param memberId The member id of the client that is putting the acquisition lock.
@param firstOffset The first offset of the acquired records.
@param lastOffset The last offset of the acquired records.
@param delayMs The delay in milliseconds after which the acquisition lock will be released.
core/src/main/java/kafka/server/share/SharePartition.java