Ceph

(gdb) l 250, 270
250           Status status =
251               env_->GetChildren(db_options_.db_paths[path_id].path, &filenames);
252           if (!status.ok()) {
253             return status;
254           }
255           if (!filenames.empty()) {
256             found_file = true;
257           }
258
259           uint64_t number;
260           FileType type;
261           for (size_t i = 0; i < filenames.size(); i++) {
262             if (ParseFileName(filenames[i], &number, &type)) {
263               if (type == kDescriptorFile) {
264                 assert(path_id == 0);
265                 manifests_.push_back(filenames[i]);
266               } else {
267                 if (number + 1 > next_file_number_) {
268                   next_file_number_ = number + 1;
269                 }
270                 if (type == kLogFile) {
(gdb) p db_options_.db_paths
$2 = std::vector of length 3, capacity 3 = {{path = "db.wal", target_size = 996147200}, {path = "db", target_size = 63753420}, {path = "db.slow", target_size = 10200547328}}
(gdb) p filenames
$3 = std::vector of length 18, capacity 30 = {"000030.log", ".", "..", "000004.sst", "000013.sst", "000019.sst", "CURRENT", "IDENTITY", "LOCK", "MANIFEST-000029", "OPTIONS-000017", "OPTIONS-000020", 
  "OPTIONS-000022.dbtmp", "OPTIONS-000025.dbtmp", "OPTIONS-000028.dbtmp", "OPTIONS-000031.dbtmp", ".", ".."}
(gdb) p path_id
$4 = 1
(gdb) p filenames[i]
$5 = "000030.log" 

Chang Liu wrote:

[...]

we want rocksdb to put WAL files on BDEV_WAL(directory called db.wal). but it seems that rocksdb saves 000030.log on BDEV_DB(directory called db).