Kai Liu b63aafce42 Allow the logs to be purged by TTL. ... Summary: * Add a SplitByTTLLogger to enable this feature. In this diff I implemented generalized AutoSplitLoggerBase class to simplify the development of such classes. * Refactor the existing AutoSplitLogger and fix several bugs. Test Plan: * Added a unit tests for different types of "auto splitable" loggers individually. * Tested the composited logger which allows the log files to be splitted by both TTL and log size. Reviewers: heyongqiang, dhruba Reviewed By: heyongqiang CC: zshao, leveldb Differential Revision: https://reviews.facebook.net/D8037		2013-02-04 19:42:40 -08:00
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leveldb	Allow the logs to be purged by TTL.	2013-02-04 19:42:40 -08:00