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Support multi-threaded DisableFileDeletions() and EnableFileDeletions()

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Summary:
We don't want two threads to clash if they concurrently call DisableFileDeletions() and EnableFileDeletions(). I'm adding a counter that will enable file deletions only after all DisableFileDeletions() calls have been negated with EnableFileDeletions().

However, we also don't want to break the old behavior, so I added a parameter force to EnableFileDeletions(). If force is true, we will still enable file deletions after every call to EnableFileDeletions(), which is what is happening now.

Test Plan: make check

Reviewers: dhruba, haobo, sanketh

Reviewed By: dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D14781
This commit is contained in:
Igor Canadi
2014-01-02 03:33:42 -08:00
parent 345fb94d26
commit b60c14f6ee
8 changed files with 45 additions and 18 deletions
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4
include/utilities/stackable_db.h
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@@ -123,8 +123,8 @@ class StackableDB : public DB {
return db_->DisableFileDeletions();
}
virtual Status EnableFileDeletions() override {
return db_->EnableFileDeletions();
virtual Status EnableFileDeletions(bool force) override {
return db_->EnableFileDeletions(force);
}
virtual Status GetLiveFiles(std::vector<std::string>& vec, uint64_t* mfs,