Paypal, Inc.

Chaoyi Chen

Fei Li

Ying Yue

Zhe Huang

Jia Mei

Wei Zhang

Jun Zhang

Xiaohan Yun

Zhenyin Yang

Yang Yu

Haoran Zhang

Junshi Guo

Meng Zang

Quin Zuo

Vadim Kutsyy

Ke Zheng

Tingjie Jia

Qinghai Fu

Wenbing Zhu

Siddarth Anand

Mikhail Kourjanski

Techniques are disclosed relating to maintaining a high availability (HA) database. In some embodiments, a computer system receives, from a plurality of host computers, a plurality of requests to access data stored in a database implemented using a plurality of clusters. In some embodiments, the computer system responds to the plurality of requests by accessing data stored in an active cluster. The computer system may then determine, based on the responding, health information for ones of the plurality of clusters, wherein the health information is generated based on real-time traffic for the database. In some embodiments, the computer system determines, based on the health information, whether to switch from accessing the active cluster to accessing a backup cluster. In some embodiments, the computer system stores, in respective clusters of the database, a changeover decision generated based on the determining.

Access consistency in high-availability databases

Systems and methods that describe a graph database system with an online component and an offline component, are provided. Write events that modify a first graph in a real-time graph database included in the online component are received. Graph logs that include changes to the first graph in the real-time graph database caused by the write events are generated. The graph logs are transmitted to an offline component of the graph database system in a chronological order. A second graph in the offline component is modified using the graph logs. The first graph and the second graph are instantiated using a graph schema.

Graph database system

Growing community of inventors

Shanghai, China

Chaoyi Chen