Logger.md

Introduction

RocksDB supports a generalized message logging infrastructure. RocksDB caters to a variety of use cases -- from low power mobile systems to high end servers running distributed applications. The framework helps extent the message logging infrastructure as per the use case requirements. The mobile app might need a relatively simpler logging mechanism, compared to a server running mission critical application. It also provides a means to integrate RocksDB log messages with the embedded application logging infrastructure.

Exiting Logger Hierarchy

The Logger class provides the interface definition for logging messages from RocksDB.

The various implementations of Logger available are :

Implementation	Use
NullLogger	/dev/null equivalent for logger
StderrLogger	Pipes the messages to std::err equivalent
HdfsLogger	Logs messages to HDFS
PosixLogger	Logs messages to POSIX file
AutoRollLogger	Automatically rolls files as they reach a certain size. Typically used for servers
WinLogger	Specialized logger for Windows OS

Writing your custom Logger

Users are encouraged to write their own logging infrastructure as per the use case by extending any one of the existing logger implementations.