db_stress shouldn't assert file size 0 if file creation fails

Summary: OnTableFileCreated() now is also called when the file creaion fails. In that case, we shouldn't assert the file size is not 0.

Test Plan: Run crash test

Reviewers: yiwu, andrewkr, IslamAbdelRahman

Reviewed By: IslamAbdelRahman

Subscribers: IslamAbdelRahman, leveldb, andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D61137

tools/db_stress.cc

@@ -920,12 +920,14 @@ class DbStressListener : public EventListener {
     assert(info.db_name == db_name_);
     assert(IsValidColumnFamilyName(info.cf_name));
     VerifyFilePath(info.file_path);
-    assert(info.file_size > 0);
     assert(info.job_id > 0 || FLAGS_compact_files_one_in > 0);
+    if (info.status.ok()) {
+      assert(info.file_size > 0);
       assert(info.table_properties.data_size > 0);
       assert(info.table_properties.raw_key_size > 0);
       assert(info.table_properties.num_entries > 0);
     }
+  }
 
  protected:
   bool IsValidColumnFamilyName(const std::string& cf_name) const {