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When a new primary key is added to an InnoDB table, then the following steps are taken by InnoDB plugin: . let t1 be the original table. . a temporary table t1@00231 will be created by cloning t1. . all data will be copied from t1 to t1@00231. . rename t1 to t1@00232. . rename t1@00231 to t1. . drop t1@00232. The rename and drop operations involve file operations. But file operations cannot be rolled back. So in row_merge_rename_tables(), just after doing data dictionary update and before doing any file operations, generate redo logs for file operations and commit the transaction. This will ensure that any crash after this commit, the table is still recoverable by moving .ibd and .frm files. Manual recovery is required. During recovery, the rename file operation redo logs are processed. Previously this was being ignored. rb://1460 approved by Marko Makela.
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