update ceph source to reef 18.1.2

[ceph.git] / ceph / src / rocksdb / table / block_based / block_builder.h

diff --git a/ceph/src/rocksdb/table/block_based/block_builder.h b/ceph/src/rocksdb/table/block_based/block_builder.h
index e3fcfc2ecc2a3e86b532b59e5cd0557cb4d69096..5f68b449bf3cc3360134e874cc2be0eda8b4e557 100644 (file)
--- a/ceph/src/rocksdb/table/block_based/block_builder.h
+++ b/ceph/src/rocksdb/table/block_based/block_builder.h
@@ -8,9 +8,10 @@
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
 #pragma once
+#include <stdint.h>
+
 #include <vector>
 
-#include <stdint.h>
 #include "rocksdb/slice.h"
 #include "rocksdb/table.h"
 #include "table/block_based/data_block_hash_index.h"
@@ -37,9 +38,24 @@ class BlockBuilder {
 
   // REQUIRES: Finish() has not been called since the last call to Reset().
   // REQUIRES: key is larger than any previously added key
+  // DO NOT mix with AddWithLastKey() between Resets. For efficiency, use
+  // AddWithLastKey() in contexts where previous added key is already known
+  // and delta encoding might be used.
   void Add(const Slice& key, const Slice& value,
            const Slice* const delta_value = nullptr);
 
+  // A faster version of Add() if the previous key is already known for all
+  // Add()s.
+  // REQUIRES: Finish() has not been called since the last call to Reset().
+  // REQUIRES: key is larger than any previously added key
+  // REQUIRES: if AddWithLastKey has been called since last Reset(), last_key
+  // is the key from most recent AddWithLastKey. (For convenience, last_key
+  // is ignored on first call after creation or Reset().)
+  // DO NOT mix with Add() between Resets.
+  void AddWithLastKey(const Slice& key, const Slice& value,
+                      const Slice& last_key,
+                      const Slice* const delta_value = nullptr);
+
   // Finish building the block and return a slice that refers to the
   // block contents.  The returned slice will remain valid for the
   // lifetime of this builder or until Reset() is called.
@@ -60,6 +76,11 @@ class BlockBuilder {
   bool empty() const { return buffer_.empty(); }
 
  private:
+  inline void AddWithLastKeyImpl(const Slice& key, const Slice& value,
+                                 const Slice& last_key,
+                                 const Slice* const delta_value,
+                                 size_t buffer_size);
+
   const int block_restart_interval_;
   // TODO(myabandeh): put it into a separate IndexBlockBuilder
   const bool use_delta_encoding_;
@@ -73,6 +94,9 @@ class BlockBuilder {
   bool finished_;  // Has Finish() been called?
   std::string last_key_;
   DataBlockHashIndexBuilder data_block_hash_index_builder_;
+#ifndef NDEBUG
+  bool add_with_last_key_called_ = false;
+#endif
 };
 
 }  // namespace ROCKSDB_NAMESPACE