Summary:
./db_compaction_test DBCompactionTest.LevelTtlCascadingCompactions passed 96 / 100 times.
```
With the fix: all runs (tried 100, 1000, 10000) succeed.
```
$ TEST_TMPDIR=/dev/shm ~/gtest-parallel/gtest-parallel ./db_compaction_test --gtest_filter=DBCompactionTest.LevelTtlCascadingCompactions --repeat=1000
[1000/1000] DBCompactionTest.LevelTtlCascadingCompactions (1895 ms)
```
Test Plan:
Build:
```
COMPILE_WITH_TSAN=1 make db_compaction_test -j100
```
Without the fix: a few runs out of 100 fail:
```
$ TEST_TMPDIR=/dev/shm KEEP_DB=1 ~/gtest-parallel/gtest-parallel ./db_compaction_test --gtest_filter=DBCompactionTest.LevelTtlCascadingCompactions --repeat=100
...
...
Note: Google Test filter = DBCompactionTest.LevelTtlCascadingCompactions
[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from DBCompactionTest
[ RUN ] DBCompactionTest.LevelTtlCascadingCompactions
db/db_compaction_test.cc:3687: Failure
Expected equality of these values:
oldest_time
Which is: 1580155869
level_to_files[6][0].oldest_ancester_time
Which is: 1580155870
DB is still at /dev/shm//db_compaction_test_6337001442947696266
[ FAILED ] DBCompactionTest.LevelTtlCascadingCompactions (1432 ms)
[----------] 1 test from DBCompactionTest (1432 ms total)
[----------] Global test environment tear-down
[==========] 1 test from 1 test case ran. (1433 ms total)
[ PASSED ] 0 tests.
[ FAILED ] 1 test, listed below:
[ FAILED ] DBCompactionTest.LevelTtlCascadingCompactions
1 FAILED TEST
[80/100] DBCompactionTest.LevelTtlCascadingCompactions returned/aborted with exit code 1 (1489 ms)
[100/100] DBCompactionTest.LevelTtlCascadingCompactions (1522 ms)
FAILED TESTS (4/100):
1419 ms: ./db_compaction_test DBCompactionTest.LevelTtlCascadingCompactions (try https://github.com/facebook/rocksdb/issues/90)
1434 ms: ./db_compaction_test DBCompactionTest.LevelTtlCascadingCompactions (try https://github.com/facebook/rocksdb/issues/84)
1457 ms: ./db_compaction_test DBCompactionTest.LevelTtlCascadingCompactions (try https://github.com/facebook/rocksdb/issues/82)
1489 ms: ./db_compaction_test DBCompactionTest.LevelTtlCascadingCompactions (try https://github.com/facebook/rocksdb/issues/74)
Differential Revision: D19587040
Pulled By: sagar0
fbshipit-source-id: 11191ae9940837643bff47ebe18b299b4be3d950
4f6c86226c