From 5c7bacd5ddad92f841827dfc4f10980b27f3d1f4 Mon Sep 17 00:00:00 2001
From: Xiaoxi Chen <xiaoxi.chen@intel.com>
Date: Thu, 11 Jun 2015 16:11:56 +0800
Subject: [PATCH] os/RocksDBStore:Drop buffer_list and key_list in transaction.

We dont need to keep this inside the transaction.

Signed-off-by: Xiaoxi Chen <xiaoxi.chen@intel.com>
---
 src/os/RocksDBStore.cc | 17 +++++++----------
 src/os/RocksDBStore.h  |  2 --
 2 files changed, 7 insertions(+), 12 deletions(-)

diff --git a/src/os/RocksDBStore.cc b/src/os/RocksDBStore.cc
index cc06bd36a9a8..ad6022d09b70 100644
--- a/src/os/RocksDBStore.cc
+++ b/src/os/RocksDBStore.cc
@@ -237,21 +237,19 @@ void RocksDBStore::RocksDBTransactionImpl::set(
   const string &k,
   const bufferlist &to_set_bl)
 {
-  buffers.push_back(to_set_bl);
-  bufferlist &bl = *(buffers.rbegin());
   string key = combine_strings(prefix, k);
-  keys.push_back(key);
-  bat->Delete(rocksdb::Slice(*(keys.rbegin())));
-  bat->Put(rocksdb::Slice(*(keys.rbegin())),
-	  rocksdb::Slice(bl.c_str(), bl.length()));
+  //bufferlist::c_str() is non-constant, so we need to make a copy
+  bufferlist val = to_set_bl;
+  bat->Delete(rocksdb::Slice(key));
+  bat->Put(rocksdb::Slice(key),
+	  rocksdb::Slice(val.c_str(), val.length()));
 }
 
 void RocksDBStore::RocksDBTransactionImpl::rmkey(const string &prefix,
 					         const string &k)
 {
   string key = combine_strings(prefix, k);
-  keys.push_back(key);
-  bat->Delete(rocksdb::Slice(*(keys.rbegin())));
+  bat->Delete(rocksdb::Slice(k));
 }
 
 void RocksDBStore::RocksDBTransactionImpl::rmkeys_by_prefix(const string &prefix)
@@ -261,8 +259,7 @@ void RocksDBStore::RocksDBTransactionImpl::rmkeys_by_prefix(const string &prefix
        it->valid();
        it->next()) {
     string key = combine_strings(prefix, it->key());
-    keys.push_back(key);
-    bat->Delete(*(keys.rbegin()));
+    bat->Delete(key);
   }
 }
 
diff --git a/src/os/RocksDBStore.h b/src/os/RocksDBStore.h
index e44977f3e46b..2955bea82cbd 100644
--- a/src/os/RocksDBStore.h
+++ b/src/os/RocksDBStore.h
@@ -131,8 +131,6 @@ public:
   class RocksDBTransactionImpl : public KeyValueDB::TransactionImpl {
   public:
     rocksdb::WriteBatch *bat;
-    list<bufferlist> buffers;
-    list<string> keys;
     RocksDBStore *db;
 
     RocksDBTransactionImpl(RocksDBStore *_db);
-- 
2.47.3