fix calling SetOptions on deprecated options

Summary:
In `cf_options_type_info`, the deprecated options are all considered to have offset zero in the `MutableCFOptions` struct. Previously we weren't checking in `GetMutableOptionsFromStrings` whether the provided option was deprecated or not and simply writing the provided value to the offset specified by `cf_options_type_info`. That meant setting any deprecated option would overwrite the first element in the struct, which is `write_buffer_size`. `db_stress` hit this often since it calls `SetOptions` with `soft_rate_limit=0` and `hard_rate_limit=0`, which are both deprecated so cause `write_buffer_size` to be set to zero, which causes it to crash on the following assertion:

```
db_stress: db/memtable.cc:106: rocksdb::MemTable::MemTable(const rocksdb::InternalKeyComparator&, const rocksdb::ImmutableCFOptions&, const rocksdb::MutableCFOptions&, rocksdb::WriteBufferManager*, rocksdb::SequenceNumber, uint32_t): Assertion `!ShouldScheduleFlush()' failed.
```

We fix it by skipping deprecated options (and logging a warning) when users provide them to `SetOptions`. I didn't want to fail the call for compatibility reasons.
Closes https://github.com/facebook/rocksdb/pull/3700

Differential Revision: D7572596

Pulled By: ajkr

fbshipit-source-id: bd5d84e14c0c39f30c5d4c6df7c1503d2c28ecf1

db/column_family.cc

@@ -1148,8 +1148,9 @@ void ColumnFamilyData::ResetThreadLocalSuperVersions() {
 Status ColumnFamilyData::SetOptions(
       const std::unordered_map<std::string, std::string>& options_map) {
   MutableCFOptions new_mutable_cf_options;
-  Status s = GetMutableOptionsFromStrings(mutable_cf_options_, options_map,
-                                          &new_mutable_cf_options);
+  Status s =
+      GetMutableOptionsFromStrings(mutable_cf_options_, options_map,
+                                   ioptions_.info_log, &new_mutable_cf_options);
   if (s.ok()) {
     mutable_cf_options_ = new_mutable_cf_options;
     mutable_cf_options_.RefreshDerivedOptions(ioptions_);

options/options_helper.cc

@@ -704,7 +704,7 @@ bool SerializeSingleOptionHelper(const char* opt_address,
 Status GetMutableOptionsFromStrings(
     const MutableCFOptions& base_options,
     const std::unordered_map<std::string, std::string>& options_map,
-    MutableCFOptions* new_options) {
+    Logger* info_log, MutableCFOptions* new_options) {
   assert(new_options);
   *new_options = base_options;
   for (const auto& o : options_map) {
@@ -717,6 +717,13 @@ Status GetMutableOptionsFromStrings(
       if (!opt_info.is_mutable) {
         return Status::InvalidArgument("Option not changeable: " + o.first);
       }
+      if (opt_info.verification == OptionVerificationType::kDeprecated) {
+        // log warning when user tries to set a deprecated option but don't fail
+        // the call for compatibility.
+        ROCKS_LOG_WARN(info_log, "%s is a deprecated option and cannot be set",
+                       o.first.c_str());
+        continue;
+      }
       bool is_ok = ParseOptionHelper(
           reinterpret_cast<char*>(new_options) + opt_info.mutable_offset,
           opt_info.type, o.second);

options/options_helper.h

@@ -31,7 +31,7 @@ ColumnFamilyOptions BuildColumnFamilyOptions(
 Status GetMutableOptionsFromStrings(
     const MutableCFOptions& base_options,
     const std::unordered_map<std::string, std::string>& options_map,
-    MutableCFOptions* new_options);
+    Logger* info_log, MutableCFOptions* new_options);
 
 Status GetMutableDBOptionsFromStrings(
     const MutableDBOptions& base_options,