Igor Canadi b06840aa7d [CF] Rethinking ColumnFamilyHandle and fix to dropping column families ... Summary: The change to the public behavior: * When opening a DB or creating new column family client gets a ColumnFamilyHandle. * As long as column family handle is alive, client can do whatever he wants with it, even drop it * Dropped column family can still be read from (using the column family handle) * Added a new call CloseColumnFamily(). Client has to close all column families that he has opened before deleting the DB * As soon as column family is closed, any calls to DB using that column family handle will fail (also any outstanding calls) Internally: * Ref-counting ColumnFamilyData * New thread-safety for ColumnFamilySet * Dropped column families are now completely dropped and their memory cleaned-up Test Plan: added some tests to column_family_test Reviewers: dhruba, haobo, kailiu, sdong CC: leveldb Differential Revision: https://reviews.facebook.net/D16101		2014-02-12 13:47:09 -08:00
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backupable_db_test.cc	[CF] Rethinking ColumnFamilyHandle and fix to dropping column families	2014-02-12 13:47:09 -08:00
backupable_db.cc	Better interface to create BackupEngine	2014-01-28 16:01:53 -08:00