27c15fb67e
Summary: * Add a method to check if the log reader is at EOF. * If we know a record has been flushed force the log_reader to believe it is not at EOF, using a new method UnMarkEof(). This does not work with MMpaed files. Test Plan: added a unit test. Reviewers: dhruba, heyongqiang Reviewed By: heyongqiang CC: leveldb Differential Revision: https://reviews.facebook.net/D9567