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由 Kosie van der Merwe 提交于
Summary: Found issues with `db_test` and `db_stress` when running valgrind. `DBImpl` had an issue where if an compaction failed then it will use the uninitialised file size of an output file is used. This manifested as the final call to output to the log in `DoCompactionWork()` branching on uninitialized memory (all the way down in printf's innards). Test Plan: Ran `valgrind --track_origins=yes ./db_test` and `valgrind ./db_stress` to see if issues disappeared. Ran `make check` to see if there were no regressions. Reviewers: vamsi, dhruba Reviewed By: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D8001
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