Explictly fail when memtable doesn't support concurrent insert

Summary: If users turn on concurrent insert but the memtable doesn't support it, they might see unexcepted crash. Fix it by explicitly fail.

Test Plan:
Run different setting of stress_test and make sure it fails correctly.
Will add a unit test too.

Reviewers: anthony, kradhakrishnan, IslamAbdelRahman, yhchiang, andrewkr, ngbronson

Reviewed By: ngbronson

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D53895

db/column_family.cc

@@ -135,6 +135,10 @@ Status CheckConcurrentWritesSupported(const ColumnFamilyOptions& cf_options) {
         "Delete filtering (filter_deletes) is not compatible with concurrent "
         "memtable writes (allow_concurrent_memtable_writes)");
   }
+  if (!cf_options.memtable_factory->IsInsertConcurrentlySupported()) {
+    return Status::InvalidArgument(
+        "Memtable doesn't concurrent writes (allow_concurrent_memtable_write)");
+  }
   return Status::OK();
 }
 

db/db_test.cc

@@ -5736,8 +5736,30 @@ TEST_F(DBTest, TableOptionsSanitizeTest) {
   options.prefix_extractor.reset(NewFixedPrefixTransform(1));
   ASSERT_OK(TryReopen(options));
 }
+
 #endif  // ROCKSDB_LITE
 
+TEST_F(DBTest, ConcurrentMemtableNotSupported) {
+  Options options = CurrentOptions();
+  options.allow_concurrent_memtable_write = true;
+  options.soft_pending_compaction_bytes_limit = 0;
+  options.hard_pending_compaction_bytes_limit = 100;
+  options.create_if_missing = true;
+
+  DestroyDB(dbname_, options);
+  options.memtable_factory.reset(NewHashLinkListRepFactory(4, 0, 3, true, 4));
+  ASSERT_NOK(TryReopen(options));
+
+  options.memtable_factory.reset(new SkipListFactory);
+  ASSERT_OK(TryReopen(options));
+
+  ColumnFamilyOptions cf_options(options);
+  cf_options.memtable_factory.reset(
+      NewHashLinkListRepFactory(4, 0, 3, true, 4));
+  ColumnFamilyHandle* handle;
+  ASSERT_NOK(db_->CreateColumnFamily(cf_options, "name", &handle));
+}
+
 TEST_F(DBTest, SanitizeNumThreads) {
   for (int attempt = 0; attempt < 2; attempt++) {
     const size_t kTotalTasks = 8;

include/rocksdb/memtablerep.h

@@ -188,10 +188,6 @@ class MemTableRep {
   // Default: true
   virtual bool IsSnapshotSupported() const { return true; }
 
-  // Return true if the current MemTableRep supports concurrent inserts
-  // Default: false
-  virtual bool IsInsertConcurrentlySupported() const { return false; }
-
  protected:
   // When *key is an internal key concatenated with the value, returns the
   // user key.
@@ -210,6 +206,10 @@ class MemTableRepFactory {
                                          const SliceTransform*,
                                          Logger* logger) = 0;
   virtual const char* Name() const = 0;
+
+  // Return true if the current MemTableRep supports concurrent inserts
+  // Default: false
+  virtual bool IsInsertConcurrentlySupported() const { return false; }
 };
 
 // This uses a skip list to store keys. It is the default.
@@ -229,6 +229,8 @@ class SkipListFactory : public MemTableRepFactory {
                                          Logger* logger) override;
   virtual const char* Name() const override { return "SkipListFactory"; }
 
+  bool IsInsertConcurrentlySupported() const override { return true; }
+
  private:
   const size_t lookahead_;
 };

memtable/skiplistrep.cc

@@ -25,8 +25,6 @@ class SkipListRep : public MemTableRep {
       transform_(transform), lookahead_(lookahead) {
   }
 
-  virtual bool IsInsertConcurrentlySupported() const override { return true; }
-
   virtual KeyHandle Allocate(const size_t len, char** buf) override {
     *buf = skip_list_.AllocateKey(len);
     return static_cast<KeyHandle>(*buf);

tools/db_crashtest.py

@@ -24,7 +24,7 @@
     "disable_data_sync": 0,
     "disable_wal": 0,
     "filter_deletes": lambda: random.randint(0, 1),
-    "allow_concurrent_memtable_write": lambda: random.randint(0, 1),
+    "allow_concurrent_memtable_write": 0,
     "iterpercent": 10,
     "max_background_compactions": 20,
     "max_bytes_for_level_base": 10485760,