Sagar Vemuri efa948741c Use creation_time or mtime when file_creation_time=0 (#5184) ... Summary: We found an issue in Periodic Compactions (introduced in #5166) where files were not being picked up for compactions as all the SST files created with older versions of RocksDB have `file_creation_time` as 0. (Note that `file_creation_time` is a new table property introduced in #5166). To address this, Periodic compactions now fall back to looking at the `creation_time` table property or the file's modification time (as given by the Env) when `file_creation_time` table property is found to be 0. Here how the file's modification time (and, in turn, the file age) is computed now: 1. Use `file_creation_time` table property if it is > 0. 1. If not, then use `creation_time` table property if it is > 0. 1. If not, then use file's mtime stat metadata given by the underlying Env. Don't consider the file at all for compaction if the modification time cannot be correctly determined based on the above conditions. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5184 Differential Revision: D14907795 Pulled By: sagar0 fbshipit-source-id: 4bb2f3631f9a3e04470c674a1d13544584e1e56c		2019-04-18 22:39:34 -07:00
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rocksdb	Use creation_time or mtime when file_creation_time=0 (#5184)	2019-04-18 22:39:34 -07:00