[t:1078], check in savepoint implementation to main line

git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@21825 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/ha_tokudb.cc

@@ -5217,7 +5217,7 @@ int ha_tokudb::create_txn(THD* thd, tokudb_trx_data* trx) {
             goto cleanup;
         }
         if (tokudb_debug & TOKUDB_DEBUG_TXN) {
-            TOKUDB_TRACE("master:%p\n", trx->all);
+            TOKUDB_TRACE("just created master:%p\n", trx->all);
         }
         trx->sp_level = trx->all;
         trans_register_ha(thd, TRUE, tokudb_hton);
@@ -5240,8 +5240,9 @@ int ha_tokudb::create_txn(THD* thd, tokudb_trx_data* trx) {
         trx->tokudb_lock_count--;  // We didn't get the lock
         goto cleanup;
     }
+    trx->sub_sp_level = trx->stmt;
     if (tokudb_debug & TOKUDB_DEBUG_TXN) {
-        TOKUDB_TRACE("stmt:%p:%p\n", trx->sp_level, trx->stmt);
+        TOKUDB_TRACE("just created stmt:%p:%p\n", trx->sp_level, trx->stmt);
     }
     reset_stmt_progress(&trx->stmt_progress);
     trans_register_ha(thd, FALSE, tokudb_hton);
@@ -5293,7 +5294,8 @@ int ha_tokudb::external_lock(THD * thd, int lock_type) {
                 goto cleanup;
             }
         }
-        transaction = trx->stmt;
+        assert(thd->in_sub_stmt == 0);
+        transaction = trx->sub_sp_level;
     }
     else {
         lock.type = TL_UNLOCK;  // Unlocked
@@ -5323,6 +5325,7 @@ int ha_tokudb::external_lock(THD * thd, int lock_type) {
                 if (tokudb_debug & TOKUDB_DEBUG_TXN)
                     TOKUDB_TRACE("commit:%p:%d\n", trx->stmt, error);
                 trx->stmt = NULL;
+                trx->sub_sp_level = NULL;
             }
         }
         transaction = NULL;
@@ -5341,7 +5344,7 @@ int ha_tokudb::external_lock(THD * thd, int lock_type) {
 */
 
 int ha_tokudb::start_stmt(THD * thd, thr_lock_type lock_type) {
-    TOKUDB_DBUG_ENTER("ha_tokudb::start_stmt");
+    TOKUDB_DBUG_ENTER("ha_tokudb::start_stmt cmd=%d %d", thd_sql_command(thd), lock_type);
     int error = 0;
 
 
@@ -5353,12 +5356,16 @@ int ha_tokudb::start_stmt(THD * thd, thr_lock_type lock_type) {
        and there could be many bdb tables referenced in the query
      */
     if (!trx->stmt) {
-        DBUG_PRINT("trans", ("starting transaction stmt"));
         error = create_txn(thd, trx);
         if (error) {
             goto cleanup;
         }
     }
+    else {
+        if (tokudb_debug & TOKUDB_DEBUG_TXN) {
+            TOKUDB_TRACE("trx->stmt already existed\n");
+        }
+    }
     //
     // we know we are in lock tables
     // attempt to grab a table lock
@@ -5370,15 +5377,16 @@ int ha_tokudb::start_stmt(THD * thd, thr_lock_type lock_type) {
     // potentially grab some locks but not all is ok.
     //
     if (lock.type <= TL_READ_NO_INSERT) {
-        acquire_table_lock(trx->stmt,lock_read);
+        acquire_table_lock(trx->sub_sp_level,lock_read);
     }
     else {
-        acquire_table_lock(trx->stmt,lock_write);
+        acquire_table_lock(trx->sub_sp_level,lock_write);
     }    
     if (added_rows > deleted_rows) {
         share->rows_from_locked_table = added_rows - deleted_rows;
     }
-    transaction = trx->stmt;
+    transaction = trx->sub_sp_level;
+    trans_register_ha(thd, FALSE, tokudb_hton);
 cleanup:
     TOKUDB_DBUG_RETURN(error);
 }
@@ -6731,7 +6739,7 @@ int ha_tokudb::optimize(THD * thd, HA_CHECK_OPT * check_opt) {
     // in order to get a valid transaction
     // this is a bit hacky, but it is the best we have right now
     //
-    txn = trx->stmt ? trx->stmt : trx->sp_level;
+    txn = trx->sub_sp_level ? trx->sub_sp_level : trx->sp_level;
     if (txn == NULL) {        
         error = db_env->txn_begin(db_env, NULL, &txn, 0);
         if (error) {

storage/tokudb/hatoku_defines.h

@@ -98,6 +98,7 @@ typedef struct st_tokudb_trx_data {
     DB_TXN *all;
     DB_TXN *stmt;
     DB_TXN *sp_level;
+    DB_TXN *sub_sp_level;
     uint tokudb_lock_count;
     tokudb_stmt_progress stmt_progress;
     bool checkpoint_lock_taken;

storage/tokudb/hatoku_hton.cc

@@ -34,6 +34,13 @@ extern "C" {
 
 #define TOKU_METADB_NAME "tokudb_meta"
 
+typedef struct savepoint_info {
+    DB_TXN* txn;
+    tokudb_trx_data* trx;
+    bool in_sub_stmt;
+} *SP_INFO, SP_INFO_T;
+
+
 static inline void *thd_data_get(THD *thd, int slot) {
     return thd->ha_data[slot].ha_ptr;
 }
@@ -109,11 +116,9 @@ static int tokudb_close_connection(handlerton * hton, THD * thd);
 static int tokudb_commit(handlerton * hton, THD * thd, bool all);
 static int tokudb_rollback(handlerton * hton, THD * thd, bool all);
 static uint tokudb_alter_table_flags(uint flags);
-#if 0
 static int tokudb_rollback_to_savepoint(handlerton * hton, THD * thd, void *savepoint);
 static int tokudb_savepoint(handlerton * hton, THD * thd, void *savepoint);
 static int tokudb_release_savepoint(handlerton * hton, THD * thd, void *savepoint);
-#endif
 handlerton *tokudb_hton;
 
 const char *ha_tokudb_ext = ".tokudb";
@@ -195,12 +200,12 @@ static int tokudb_init_func(void *p) {
 
     tokudb_hton->create = tokudb_create_handler;
     tokudb_hton->close_connection = tokudb_close_connection;
-#if 0
-    tokudb_hton->savepoint_offset = sizeof(DB_TXN *);
+
+    tokudb_hton->savepoint_offset = sizeof(SP_INFO_T);
     tokudb_hton->savepoint_set = tokudb_savepoint;
     tokudb_hton->savepoint_rollback = tokudb_rollback_to_savepoint;
     tokudb_hton->savepoint_release = tokudb_release_savepoint;
-#endif
+
     tokudb_hton->commit = tokudb_commit;
     tokudb_hton->rollback = tokudb_rollback;
     tokudb_hton->panic = tokudb_end;
@@ -590,7 +595,7 @@ static int tokudb_commit(handlerton * hton, THD * thd, bool all) {
     DB_TXN **txn = all ? &trx->all : &trx->stmt;
     if (*txn) {
         if (tokudb_debug & TOKUDB_DEBUG_TXN) {
-            TOKUDB_TRACE("commit:%d:%p\n", all, *txn);
+            TOKUDB_TRACE("doing txn commit:%d:%p\n", all, *txn);
         }
         commit_txn_with_progress(*txn, syncflag, thd);
         if (*txn == trx->sp_level) {
@@ -599,7 +604,7 @@ static int tokudb_commit(handlerton * hton, THD * thd, bool all) {
         *txn = 0;
     } 
     else if (tokudb_debug & TOKUDB_DEBUG_TXN) {
-        TOKUDB_TRACE("commit0\n");
+        TOKUDB_TRACE("nothing to commit %d\n", all);
     }
     reset_stmt_progress(&trx->stmt_progress);
     TOKUDB_DBUG_RETURN(0);
@@ -629,27 +634,51 @@ static int tokudb_rollback(handlerton * hton, THD * thd, bool all) {
     TOKUDB_DBUG_RETURN(0);
 }
 
-#if 0
 
 static int tokudb_savepoint(handlerton * hton, THD * thd, void *savepoint) {
     TOKUDB_DBUG_ENTER("tokudb_savepoint");
     int error;
-    DB_TXN **save_txn = (DB_TXN **) savepoint;
+    SP_INFO save_info = (SP_INFO)savepoint;
     tokudb_trx_data *trx = (tokudb_trx_data *) thd_data_get(thd, hton->slot);
-    if (!(error = db_env->txn_begin(db_env, trx->sp_level, save_txn, 0))) {
-        trx->sp_level = *save_txn;
+    if (thd->in_sub_stmt) {
+        assert(trx->stmt);
+        error = db_env->txn_begin(db_env, trx->sub_sp_level, &(save_info->txn), 0);
+        if (error) {
+            goto cleanup;
+        }
+        trx->sub_sp_level = save_info->txn;
+        save_info->in_sub_stmt = true;
     }
+    else {
+        error = db_env->txn_begin(db_env, trx->sp_level, &(save_info->txn), 0);
+        if (error) {
+            goto cleanup;
+        }
+        trx->sp_level = save_info->txn;
+        save_info->in_sub_stmt = false;
+    }
+    save_info->trx = trx;
+    error = 0;
+cleanup:
     TOKUDB_DBUG_RETURN(error);
 }
 
 static int tokudb_rollback_to_savepoint(handlerton * hton, THD * thd, void *savepoint) {
     TOKUDB_DBUG_ENTER("tokudb_rollback_to_savepoint");
     int error;
-    DB_TXN *parent, **save_txn = (DB_TXN **) savepoint;
+    SP_INFO save_info = (SP_INFO)savepoint;
+    DB_TXN* parent = NULL;
+    DB_TXN* txn_to_rollback = save_info->txn;
+
     tokudb_trx_data *trx = (tokudb_trx_data *) thd_data_get(thd, hton->slot);
-    parent = (*save_txn)->parent;
-    if (!(error = (*save_txn)->abort(*save_txn))) {
+    parent = txn_to_rollback->parent;
+    if (!(error = txn_to_rollback->abort(txn_to_rollback))) {
+        if (save_info->in_sub_stmt) {
+            trx->sub_sp_level = parent;
+        }
+        else {
             trx->sp_level = parent;
+        }
         error = tokudb_savepoint(hton, thd, savepoint);
     }
     TOKUDB_DBUG_RETURN(error);
@@ -658,17 +687,25 @@ static int tokudb_rollback_to_savepoint(handlerton * hton, THD * thd, void *save
 static int tokudb_release_savepoint(handlerton * hton, THD * thd, void *savepoint) {
     TOKUDB_DBUG_ENTER("tokudb_release_savepoint");
     int error;
-    DB_TXN *parent, **save_txn = (DB_TXN **) savepoint;
+
+    SP_INFO save_info = (SP_INFO)savepoint;
+    DB_TXN* parent = NULL;
+    DB_TXN* txn_to_commit = save_info->txn;
+
     tokudb_trx_data *trx = (tokudb_trx_data *) thd_data_get(thd, hton->slot);
-    parent = (*save_txn)->parent;
-    if (!(error = (*save_txn)->commit(*save_txn, 0))) {
+    parent = txn_to_commit->parent;
+    if (!(error = txn_to_commit->commit(txn_to_commit, 0))) {
+        if (save_info->in_sub_stmt) {
+            trx->sub_sp_level = parent;
+        }
+        else {
             trx->sp_level = parent;
-        *save_txn = 0;
+        }
+        save_info->txn = NULL;
     }
     TOKUDB_DBUG_RETURN(error);
 }
 
-#endif
 
 static int smart_dbt_do_nothing (DBT const *key, DBT  const *row, void *context) {
   return 0;