Dhruba Borthakur f4c2b7cf97 Enhance ReadOnly mode to process the all committed transactions. ... Summary: Leveldb has an api OpenForReadOnly() that opens the database in readonly mode. This call had an option to not process the transaction log. This patch removes this option and always processes all transactions that had been committed. It has been done in such a way that it does not create/write to any new files in the process. The invariant of "no-writes" to the leveldb data directory is still true. This enhancement allows multiple threads to open the same database in readonly mode and access all trancations that were committed right upto the OpenForReadOnly call. I changed the public API to match the new semantics because there are no users who are currently using this api. Test Plan: make clean check Reviewers: sheki Reviewed By: sheki CC: leveldb Differential Revision: https://reviews.facebook.net/D7479		2012-12-19 16:30:46 -08:00
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leveldb	Enhance ReadOnly mode to process the all committed transactions.	2012-12-19 16:30:46 -08:00