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Move WAL files to archive directory, instead of deleting.

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Summary:
Create a directory "archive" in the DB directory.
During DeleteObsolteFiles move the WAL files (*.log) to the Archive directory,
instead of deleting.

Test Plan: Created a DB using DB_Bench. Reopened it. Checked if files move.

Reviewers: dhruba

Reviewed By: dhruba

Differential Revision: https://reviews.facebook.net/D6975
This commit is contained in:
sheki
2012-11-26 13:56:45 -08:00
parent d29f181923
commit d4627e6de4
12 changed files with 252 additions and 13 deletions
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18
include/leveldb/env.h
View File

@@ -81,15 +81,22 @@ class Env {
// Delete the named file.
virtual Status DeleteFile(const std::string& fname) = 0;
// Create the specified directory.
// Create the specified directory. Returns error if directory exists.
virtual Status CreateDir(const std::string& dirname) = 0;
// Creates directory if missing. Return Ok if it exists, or successful in
// Creating.
virtual Status CreateDirIfMissing(const std::string& dirname) = 0;
// Delete the specified directory.
virtual Status DeleteDir(const std::string& dirname) = 0;
// Store the size of fname in *file_size.
virtual Status GetFileSize(const std::string& fname, uint64_t* file_size) = 0;
// Store the last modification time of fname in *file_mtime.
virtual Status GetFileModificationTime(const std::string& fname,
uint64_t* file_mtime) = 0;
// Rename file src to target.
virtual Status RenameFile(const std::string& src,
const std::string& target) = 0;
@@ -323,10 +330,19 @@ class EnvWrapper : public Env {
}
Status DeleteFile(const std::string& f) { return target_->DeleteFile(f); }
Status CreateDir(const std::string& d) { return target_->CreateDir(d); }
Status CreateDirIfMissing(const std::string& d) {
return target_->CreateDirIfMissing(d);
}
Status DeleteDir(const std::string& d) { return target_->DeleteDir(d); }
Status GetFileSize(const std::string& f, uint64_t* s) {
return target_->GetFileSize(f, s);
}
Status GetFileModificationTime(const std::string& fname,
uint64_t* file_mtime) {
return target_->GetFileModificationTime(fname, file_mtime);
}
Status RenameFile(const std::string& s, const std::string& t) {
return target_->RenameFile(s, t);
}

10
include/leveldb/options.h
View File

@@ -343,6 +343,16 @@ struct Options {
// Disable automatic compactions. Manual compactions can still
// be issued on this database.
bool disable_auto_compactions;
// The number of seconds a WAL(write ahead log) should be kept after it has
// been marked as Not Live. If the value is set. The WAL files are moved to
// the archive direcotory and deleted after the given TTL.
// If set to 0, WAL files are deleted as soon as they are not required by
// the database.
// If set to std::numeric_limits<uint64_t>::max() the WAL files will never be
// deleted.
// Default : 0
uint64_t WAL_ttl_seconds;
};
// Options that control read operations