Revert usage of Defer. (#6410)

Summary:
Seems like this caused the following test failure on AppVeyor:
DBTest2.CrashInRecoveryMultipleCF
c:\projects\rocksdb\db\db_test_util.cc(107): error: DestroyDB(dbname_, options)
IO error: Failed to delete: C:\projects\rocksdb\db_tests\\testrocksdb-3112//db_test2_10791409581227174103/000013.sst: Access is denied.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6410

Test Plan: Wait to see whether the AppVeyor test passes.

Differential Revision: D19879872

Pulled By: cheng-chang

fbshipit-source-id: 59a9c55ca88566e9210c0b715ecc45a4fd9afe26

db/version_set.cc

@@ -50,7 +50,6 @@
 #include "table/two_level_iterator.h"
 #include "test_util/sync_point.h"
 #include "util/coding.h"
-#include "util/defer.h"
 #include "util/stop_watch.h"
 #include "util/string_util.h"
 #include "util/user_comparator_wrapper.h"
@@ -3614,14 +3613,6 @@ Status VersionSet::ProcessManifestWrites(
   autovector<Version*> versions;
   autovector<const MutableCFOptions*> mutable_cf_options_ptrs;
   std::vector<std::unique_ptr<BaseReferencedVersionBuilder>> builder_guards;
-  Status s;
-  Defer defer([&s, &versions]() {
-    if (!s.ok()) {
-      for (auto v : versions) {
-        delete v;
-      }
-    }
-  });
 
   if (first_writer.edit_list.front()->IsColumnFamilyManipulation()) {
     // No group commits for column family add or drop
@@ -3707,8 +3698,12 @@ Status VersionSet::ProcessManifestWrites(
         } else if (group_start != std::numeric_limits<size_t>::max()) {
           group_start = std::numeric_limits<size_t>::max();
         }
-        s = LogAndApplyHelper(last_writer->cfd, builder, e, mu);
+        Status s = LogAndApplyHelper(last_writer->cfd, builder, e, mu);
         if (!s.ok()) {
+          // free up the allocated memory
+          for (auto v : versions) {
+            delete v;
+          }
           return s;
         }
         batch_edits.push_back(e);
@@ -3718,8 +3713,12 @@ Status VersionSet::ProcessManifestWrites(
       assert(!builder_guards.empty() &&
              builder_guards.size() == versions.size());
       auto* builder = builder_guards[i]->version_builder();
-      s = builder->SaveTo(versions[i]->storage_info());
+      Status s = builder->SaveTo(versions[i]->storage_info());
       if (!s.ok()) {
+        // free up the allocated memory
+        for (auto v : versions) {
+          delete v;
+        }
         return s;
       }
     }
@@ -3762,6 +3761,7 @@ Status VersionSet::ProcessManifestWrites(
 #endif  // NDEBUG
 
   uint64_t new_manifest_file_size = 0;
+  Status s;
 
   assert(pending_manifest_file_number_ == 0);
   if (!descriptor_log_ ||
@@ -3968,6 +3968,9 @@ Status VersionSet::ProcessManifestWrites(
     ROCKS_LOG_ERROR(db_options_->info_log,
                     "Error in committing version edit to MANIFEST: %s",
                     version_edits.c_str());
+    for (auto v : versions) {
+      delete v;
+    }
     // If manifest append failed for whatever reason, the file could be
     // corrupted. So we need to force the next version update to start a
     // new manifest file.