Badger: Fast Key-Value DB in Go Manish R Jain, Dgraph Labs Apr 14,2018 Gopher China, Shanghai Dgraph Labs Fast, Distributed graph database. Sparse data sets. Lots of relationships. https://dgraph https://dgraph.io What is Badger? Badger is an embedded key-value database, written in Go. Licensed under Apache 2.0. Current Status Closing v2.0. Close to 3500 Github starts. 42 contributors. Used key-value func set() error { fmt.Println("\nRunning SET") return db.Update(func(txn *badger.Txn) error { if err := txn.Set([]byte("foo"), []byte("bar")); err != nil

Notes Go 1.4 Release Notes ..... ## 用到 CGO 的一些项目 NanoVisor Cilium NginxUnit Dragonboat Badger Go with OpenCV etc ## CGO 开销调研 CGO 一次调用开销在 0.08 ~ 1.626 us，另外 CGO 调用开销呈线性增长；CGO 中增加 Go 自身计算逻辑时，其

Server. |License|Libraries| |---|---| |Apache 2.0|·github.com/aws/aws-sdk-go-v2·github.com/dgraph-io/badger·github.com/golang/mock·github.com/google/wire·github.com/pkg/errors·github.com/pquerna/otp·github

arguments >> parser.parse_args(['spam', 'badger']) usage: PROG [-h] [--foo FOO] [bar] PROG: error: extra arguments found: badger ## 包含－的参数 The parse_args() method attempts to give errors #39;) >>> parser.add_argument('-badger') >>> parser.parse_args('-bac MMM'.split()) Namespace(bacon='MMM', badger=None) >>> parser.parse_args('-bad Namespace(bacon=None, badger='WOOD') >>> parser.parse_args('-ba BA'.split()) usage: PROG [-h] [-bacon BACON] [-badger BADGER] PROG: error: ambiguous option: -ba could match -badger, -bacon

arguments >> parser.parse_args(['spam', 'badger']) usage: PROG [-h] [--foo FOO] [bar] PROG: error: extra arguments found: badger ## 包含－的参数 The parse_args() method attempts to give errors #39;) >>> parser.add_argument('-badger') >>> parser.parse_args('-bac MMM'.split()) Namespace(bacon='MMM', badger=None) >>> parser.parse_args('-bad Namespace(bacon=None, badger='WOOD') >>> parser.parse_args('-ba BA'.split()) usage: PROG [-h] [-bacon BACON] [-badger BADGER] PROG: error: ambiguous option: -ba could match -badger, -bacon

arguments >> parser.parse_args(['spam', 'badger']) usage: PROG [-h] [--foo FOO] [bar] PROG: error: extra arguments found: badger ## 包含－的参数 The parse_args() method attempts to give errors #39;) >>> parser.add_argument('-badger') >>> parser.parse_args('-bac MMM'.split()) Namespace(bacon='MMM', badger=None) >>> parser.parse_args('-bad Namespace(bacon=None, badger='WOOD') >>> parser.parse_args('-ba BA'.split()) usage: PROG [-h] [-bacon BACON] [-badger BADGER] PROG: error: ambiguous option: -ba could match -badger, -bacon

arguments >> parser.parse_args(['spam', 'badger']) usage: PROG [-h] [--foo FOO] [bar] PROG: error: extra arguments found: badger ## 包含－的参数 parse_args() 方法会在用户明显出错时尝试给出错误信息，但某些情况本身就存在歧义。例如，命令行参数 #39;) >>> parser.add_argument('-badger') >>> parser.parse_args('-bac MMM'.split()) Namespace(bacon='MMM', badger=None) >>> parser.parse_args('-bad Namespace(bacon=None, badger='WOOD') >>> parser.parse_args('-ba BA'.split()) usage: PROG [-h] [-bacon BACON] [-badger BADGER] PROG: error: ambiguous option: -ba could match -badger, -bacon

>>> parser.parse_args(['spam', 'badger']) usage: PROG [-h] [--foo FOO] [bar] PROG: error: extra arguments found: badger ``` ## 包含-的参数 parse_args()方法会在用户明显出错时尝试给出错误信息，但某些情 9;) >>> parser.add_argument('-badger') >>> parser.parse_args('-bac MMM'.split()) Namespace(bacon='MMM', badger=None) >>> parser.parse_args('-bad Namespace(bacon=None, badger='WOOD') >>> parser.parse_args('-ba BA'.split()) usage: PROG [-h] [-bacon BACON] [-badger BADGER] PROG: error: ambiguous option: -ba could match -badger, -bacon

arguments >> parser.parse_args(['spam', 'badger']) usage: PROG [-h] [--foo FOO] [bar] PROG: error: extra arguments found: badger ## 包含－的参数 parse_args() 方法会在用户明显出错时尝试给出错误信息，但某些情况本身就存在歧义。例如，命令行参数 #39;) >>> parser.add_argument('-badger') >>> parser.parse_args('-bac MMM'.split()) Namespace(bacon='MMM', badger=None) >>> parser.parse_args('-bad Namespace(bacon=None, badger='WOOD') >>> parser.parse_args('-ba BA'.split()) usage: PROG [-h] [-bacon BACON] [-badger BADGER] PROG: error: ambiguous option: -ba could match -badger, -bacon

>>> parser.parse_args(['spam', 'badger']) usage: PROG [-h] [--foo FOO] [bar] PROG: error: extra arguments found: badger ``` ## 包含-的参数 parse_args()方法会在用户明显出错时尝试给出错误信息，但某些情 9;) >>> parser.add_argument('-badger') >>> parser.parse_args('-bac MMM'.split()) Namespace(bacon='MMM', badger=None) >>> parser.parse_args('-bad Namespace(bacon=None, badger='WOOD') >>> parser.parse_args('-ba BA'.split()) usage: PROG [-h] [-bacon BACON] [-badger BADGER] PROG: error: ambiguous option: -ba could match -badger, -bacon