ANNUAL JREBEL REPORT 2017 UPDATE
We have used MVEDSUa to update several high-performance servers: Redis, Memcached, and VSFTPD. We have implemented this approach, which we call MVEDSUa, by extending the Kitsune DSU framework with Varan, a state-of-the-art MVE system. If the new version shows no problems after a warmup period, operators can make it permanent and discard the original version. This is safe because the MVE system keeps the state of both versions in sync. Unexpected divergences signal possible errors and roll back the update, which simply means terminating the updated version and reverting to the original version. Expected divergences are specified by the programmer using an MVE-specific DSL. Once the update completes, the MVE system monitors that the responses of both versions agree for the same inputs. To avoid delay in service, the update is applied to a forked copy while the original system continues to operate. This paper makes the key observation that both problems can be addressed by employing Multi-Version Execution (MVE). Furthermore, the time taken to dynamically apply the update may be unacceptable if it introduces a long delay in service.
ANNUAL JREBEL REPORT 2017 SOFTWARE
Unfortunately, bugs in the update itself-whether in the changed code or in the way the change is introduced dynamically-may cause the updated software to crash or misbehave. However, a direct link between animal and human infection data could not be established in this study.Dynamic Software Updating (DSU) is a technique for patching stateful software without shutting it down, which enables both timely updates and non-stop service.
![annual jrebel report 2017 annual jrebel report 2017](https://wjrhind.com/wp-content/uploads/2018/01/NBC-2017-Annual-Report.png)
Interestingly, the two laboratories with significantly higher seroprevalences are located in the regions with the largest goat populations as well as, for one laboratory, with the highest livestock density in Switzerland. Overall, seroprevalence in humans ranged between 1.7% and 3.5% from 2007 to 2011, and no temporal trends were observed. Annual human Q fever serology data were provided by five major Swiss laboratories. To our knowledge, this is the first study reporting C. burnetii quantities in a large number of small ruminant abortion samples.
![annual jrebel report 2017 annual jrebel report 2017](https://nationaltrustcanada.ca/wp-content/uploads/2017/09/AR-2016-2017-Cover400.jpg)
The quantification of C. burnetii in 97 ovine and caprine abortion samples by real-time PCR indicated shedding of >10 4 bacteria/g in 13.4% of all samples tested. The seroprevalence of C. burnetii in small ruminants was determined by commercial ELISA from a representative sample of 100 sheep flocks and 72 goat herds. Specific objectives of this cross-sectional study were to (i) estimate the seroprevalence of C. burnetii in sheep and goats, (ii) quantify the amount of bacteria shed during abortion and (iii) analyse temporal trends in human C. burnetii infections. In this study, we describe the current situation with respect to Coxiella (C.) burnetii infections in small ruminants and humans in Switzerland, as a basis for future epidemiological investigations and public health risk assessments. In Switzerland, the prevalence of Q fever in animals and humans has not been studied in recent years.
![annual jrebel report 2017 annual jrebel report 2017](https://cdn.slidesharecdn.com/ss_thumbnails/annualactivityreport-2017-190517192222-thumbnail-4.jpg)
The recent Q fever epidemic in the Netherlands raised concerns about the potential risk of outbreaks in other European countries.