PayPal Open Sources Key-Worth Retailer, JunoDB

(Benny Marty/Shutterstock)

PayPal final month launched the supply code for JunoDB, a distributed key-value retailer it developed internally and which right this moment powers a wide range of backend companies on the fee website, together with 350 billion transaction requests per day, the corporate says.

JunoDB was initially developed over a decade in the past in C++ to handle the particular wants of the corporate, in keeping with a Might 17 weblog submit by Yaping Shi, principal MTS, architect at PayPal. The corporate was transferring to a microservices structure that might require supporting a lot of persistent inbound connections to knowledge shops, however the firm’s IT architects couldn’t discover a appropriate product to assist that method.

“Since no business or open-source options had been out there to deal with the required scale out-of-the-box, we developed our personal answer to undertake a horizontal scaling technique for key-value shops,” Shi writes.

The brand new database would addresses two main scaling wants in distributed key-value shops, in keeping with Shi: dealing with the a lot of shopper connections, and dealing with development in learn and write throughput.

PayPal database builders created JunoDB with a proxy-based structure to allow horizontal scaling. The JunoDB shopper library, which resides within the software, was developed to allow easy knowledge actions by the JunoDB proxy, which handle requests from the purchasers, coordinates with the information saved on the JunoDB storage server, and gives load balancing. All knowledge is encrypted, both on the shopper or the proxy layer utilizing TLS; all saved knowledge can be encrypted utilizing TLS.

JunoDB structure (Supply: JunoDB GitHub web page)

JunoDB makes use of constant hashing to partition knowledge and decrease knowledge motion. To assist horizontal scale, it shards knowledge amongst a variety of database partitions positioned on server nodes. It additionally makes use of shards inside shards, or “micro shards,” which function constructing blocks for knowledge redistribution, Shi writes.

“Our environment friendly knowledge redistribution course of allows fast incremental scaling of a JunoDB cluster to accommodate visitors development,” Shi writes. “Presently, a big JunoDB cluster may comprise over 200 storage nodes, processing over 100 billion requests day by day.”

JunoDB has since been rewritten in Golang to offer multi-threading and multi-core capabilities. With JunoDB’s knowledge replication strategies, together with within-data middle and cross-data middle replication, the key-value retailer delivers six 9’s of system availability for PayPal.

JunoDB has grow to be a essential a part of PayPal’s infrastructure, and powers virtually the entire firm’s purposes right this moment. That features use as a brief cache for knowledge, to scale back masses on relational databases, as a “latency bridge” for Oracle purposes, and to offer “idempotency,” or a discount in duplicate processing.

“Whereas different NoSQL options could carry out nicely in sure use-cases, JunoDB is unmatched in the case of assembly PayPal’s excessive scale, safety, and availability wants,” Shi writes.

The database is known as after Juno, who was the queen of heaven in Greek mythology.

PayPal has launched JunoDB below a permissive Apache 2.0 license. You may obtain JunoDB from GitHub at

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