Change default value of `bytes_max_delete_chunk` to 0 in NewSstFileManager() (#4092)

Summary:
Now by default, with NewSstFileManager, checkpoints may be corrupted. Disable this feature to avoid this issue.
Closes https://github.com/facebook/rocksdb/pull/4092

Differential Revision: D8729856

Pulled By: siying

fbshipit-source-id: 914c321d6eaf52d8c5981171322d85dd29088307

HISTORY.md

@@ -17,6 +17,7 @@
 * fix deadlock with enable_pipelined_write=true and max_successive_merges > 0
 * Fix corruption in non-iterator reads when mmap is used for file reads
 * Fix bug with prefix search in partition filters where a shared prefix would be ignored from the later partitions. The bug could report an eixstent key as missing. The bug could be triggered if prefix_extractor is set and partition filters is enabled.
+* Change default value of `bytes_max_delete_chunk` to 0 in NewSstFileManager() as it doesn't work well with checkpoints.
 
 ## 5.14.0 (5/16/2018)
 ### Public API Change

include/rocksdb/sst_file_manager.h

@@ -98,12 +98,13 @@ class SstFileManager {
 //    DeleteScheduler immediately
 // @param bytes_max_delete_chunk: if a single file is larger than delete chunk,
 //    ftruncate the file by this size each time, rather than dropping the whole
-//    file. 0 means to always delete the whole file.
+//    file. 0 means to always delete the whole file. NOTE this options may not
+//    work well with checkpoints, which relies on file system hard links.
 extern SstFileManager* NewSstFileManager(
     Env* env, std::shared_ptr<Logger> info_log = nullptr,
     std::string trash_dir = "", int64_t rate_bytes_per_sec = 0,
     bool delete_existing_trash = true, Status* status = nullptr,
     double max_trash_db_ratio = 0.25,
-    uint64_t bytes_max_delete_chunk = 64 * 1024 * 1024);
+    uint64_t bytes_max_delete_chunk = 0);
 
 }  // namespace rocksdb