Refs Tokutek/mongo#650 Remove fullhash from rollback_log_nodes; fixes issue...

Refs Tokutek/mongo#650 Remove fullhash from rollback_log_nodes; fixes issue with large (or childful) transactions during recovery due to hash_id and filenum being decoupled

ft/ft-internal.h

@@ -632,7 +632,7 @@ int toku_serialize_ftnode_to(int fd, BLOCKNUM, FTNODE node, FTNODE_DISK_DATA* nd
 int toku_serialize_rollback_log_to (int fd, ROLLBACK_LOG_NODE log, SERIALIZED_ROLLBACK_LOG_NODE serialized_log, bool is_serialized,
                                     FT h, bool for_checkpoint);
 void toku_serialize_rollback_log_to_memory_uncompressed(ROLLBACK_LOG_NODE log, SERIALIZED_ROLLBACK_LOG_NODE serialized);
-int toku_deserialize_rollback_log_from (int fd, BLOCKNUM blocknum, uint32_t fullhash, ROLLBACK_LOG_NODE *logp, FT h);
+int toku_deserialize_rollback_log_from (int fd, BLOCKNUM blocknum, ROLLBACK_LOG_NODE *logp, FT h);
 int toku_deserialize_bp_from_disk(FTNODE node, FTNODE_DISK_DATA ndd, int childnum, int fd, struct ftnode_fetch_extra* bfe);
 int toku_deserialize_bp_from_compressed(FTNODE node, int childnum, struct ftnode_fetch_extra *bfe);
 int toku_deserialize_ftnode_from (int fd, BLOCKNUM off, uint32_t /*fullhash*/, FTNODE *ftnode, FTNODE_DISK_DATA* ndd, struct ftnode_fetch_extra* bfe);

ft/ft_layout_version.h

@@ -118,6 +118,7 @@ enum ft_layout_version_e {
     FT_LAYOUT_VERSION_22 = 22, // Ming: Add oldest known referenced xid to each ftnode, for better garbage collection
     FT_LAYOUT_VERSION_23 = 23, // Ming: Fix upgrade path #5902
     FT_LAYOUT_VERSION_24 = 24, // Riddler: change logentries that log transactions to store TXNID_PAIRs instead of TXNIDs
+    FT_LAYOUT_VERSION_25 = 25, // SecretSquirrel: Remove fullhashes from rollback_log_nodes
     FT_NEXT_VERSION,           // the version after the current version
     FT_LAYOUT_VERSION   = FT_NEXT_VERSION-1, // A hack so I don't have to change this line.
     FT_LAYOUT_MIN_SUPPORTED_VERSION = FT_LAYOUT_VERSION_13, // Minimum version supported

ft/ft_node-serialize.cc

@@ -2763,8 +2763,7 @@ toku_serialize_rollback_log_to (int fd, ROLLBACK_LOG_NODE log, SERIALIZED_ROLLBA
 }
 
 static int
-deserialize_rollback_log_from_rbuf (BLOCKNUM blocknum, uint32_t fullhash, ROLLBACK_LOG_NODE *log_p,
-                                    FT h, struct rbuf *rb) {
+deserialize_rollback_log_from_rbuf (BLOCKNUM blocknum, ROLLBACK_LOG_NODE *log_p, struct rbuf *rb) {
     ROLLBACK_LOG_NODE MALLOC(result);
     int r;
     if (result==NULL) {
@@ -2793,13 +2792,7 @@ deserialize_rollback_log_from_rbuf (BLOCKNUM blocknum, uint32_t fullhash, ROLLBA
         r = toku_db_badformat();
         goto died0;
     }
-    result->hash    = toku_cachetable_hash(h->cf, result->blocknum);
-    if (result->hash != fullhash) {
-        r = toku_db_badformat();
-        goto died0;
-    }
     result->previous       = rbuf_blocknum(rb);
-    result->previous_hash  = toku_cachetable_hash(h->cf, result->previous);
     result->rollentry_resident_bytecount = rbuf_ulonglong(rb);
 
     size_t arena_initial_size = rbuf_ulonglong(rb);
@@ -2840,13 +2833,13 @@ deserialize_rollback_log_from_rbuf (BLOCKNUM blocknum, uint32_t fullhash, ROLLBA
 }
 
 static int
-deserialize_rollback_log_from_rbuf_versioned (uint32_t version, BLOCKNUM blocknum, uint32_t fullhash,
+deserialize_rollback_log_from_rbuf_versioned (uint32_t version, BLOCKNUM blocknum,
                                               ROLLBACK_LOG_NODE *log,
-                                              FT h, struct rbuf *rb) {
+                                              struct rbuf *rb) {
     int r = 0;
     ROLLBACK_LOG_NODE rollback_log_node = NULL;
     invariant(version==FT_LAYOUT_VERSION); //Rollback log nodes do not survive version changes.
-    r = deserialize_rollback_log_from_rbuf(blocknum, fullhash, &rollback_log_node, h, rb);
+    r = deserialize_rollback_log_from_rbuf(blocknum, &rollback_log_node, rb);
     if (r==0) {
         *log = rollback_log_node;
     }
@@ -3022,8 +3015,7 @@ read_and_decompress_block_from_fd_into_rbuf(int fd, BLOCKNUM blocknum,
 
 // Read rollback log node from file into struct.  Perform version upgrade if necessary.
 int
-toku_deserialize_rollback_log_from (int fd, BLOCKNUM blocknum, uint32_t fullhash,
-                                    ROLLBACK_LOG_NODE *logp, FT h) {
+toku_deserialize_rollback_log_from (int fd, BLOCKNUM blocknum, ROLLBACK_LOG_NODE *logp, FT h) {
     int layout_version = 0;
     int r;
     struct rbuf rb = {.buf = NULL, .size = 0, .ndone = 0};
@@ -3037,7 +3029,6 @@ toku_deserialize_rollback_log_from (int fd, BLOCKNUM blocknum, uint32_t fullhash
         ROLLBACK_LOG_NODE XMALLOC(log);
         rollback_empty_log_init(log);
         log->blocknum.b = blocknum.b;
-        log->hash = fullhash;
         r = 0;
         *logp = log;
         goto cleanup;
@@ -3054,7 +3045,7 @@ toku_deserialize_rollback_log_from (int fd, BLOCKNUM blocknum, uint32_t fullhash
         }
     }
 
-    r = deserialize_rollback_log_from_rbuf_versioned(layout_version, blocknum, fullhash, logp, h, &rb);
+    r = deserialize_rollback_log_from_rbuf_versioned(layout_version, blocknum, logp, &rb);
 
 cleanup:
     if (rb.buf) toku_free(rb.buf);

ft/log-internal.h

@@ -209,15 +209,12 @@ struct txn_roll_info {
     // the spilled rollback head is the block number of the first rollback node
     // that makes up the rollback log chain
     BLOCKNUM spilled_rollback_head;
-    uint32_t spilled_rollback_head_hash;
     // the spilled rollback is the block number of the last rollback node that
     // makes up the rollback log chain. 
     BLOCKNUM spilled_rollback_tail;
-    uint32_t spilled_rollback_tail_hash;
     // the current rollback node block number we may use. if this is ROLLBACK_NONE,
     // then we need to create one and set it here before using it.
     BLOCKNUM current_rollback; 
-    uint32_t current_rollback_hash;
 };
 
 struct tokutxn {

ft/logformat.cc

@@ -155,9 +155,7 @@ const struct logtype rollbacks[] = {
     {"rollinclude", 'r', FA{{"TXNID_PAIR",     "xid", 0},
                             {"uint64_t", "num_nodes", 0},
                             {"BLOCKNUM",  "spilled_head", 0},
-                            {"uint32_t", "spilled_head_hash", 0},
                             {"BLOCKNUM",  "spilled_tail", 0},
-                            {"uint32_t", "spilled_tail_hash", 0},
                             NULLFIELD}, LOG_BEGIN_ACTION_NA},
     {"load", 'l', FA{{"FILENUM",    "old_filenum", 0},
                      {"BYTESTRING", "new_iname", 0},

ft/roll.cc

@@ -365,9 +365,7 @@ static int
 toku_apply_rollinclude (TXNID_PAIR      xid,
                         uint64_t   num_nodes,
                         BLOCKNUM   spilled_head,
-                        uint32_t   spilled_head_hash __attribute__((__unused__)),
                         BLOCKNUM   spilled_tail,
-                        uint32_t   spilled_tail_hash,
                         TOKUTXN    txn,
                         LSN        oplsn,
                         apply_rollback_item func) {
@@ -375,7 +373,6 @@ toku_apply_rollinclude (TXNID_PAIR      xid,
     struct roll_entry *item;
 
     BLOCKNUM next_log      = spilled_tail;
-    uint32_t next_log_hash = spilled_tail_hash;
     uint64_t last_sequence = num_nodes;
 
     bool found_head = false;
@@ -383,7 +380,7 @@ toku_apply_rollinclude (TXNID_PAIR      xid,
     while (next_log.b != ROLLBACK_NONE.b) {
         //pin log
         ROLLBACK_LOG_NODE log;
-        toku_get_and_pin_rollback_log(txn, next_log, next_log_hash, &log);
+        toku_get_and_pin_rollback_log(txn, next_log, &log);
         toku_rollback_verify_contents(log, xid, last_sequence - 1);
         last_sequence = log->sequence;
         
@@ -400,16 +397,13 @@ toku_apply_rollinclude (TXNID_PAIR      xid,
             assert(log->sequence == 0);
         }
         next_log      = log->previous;
-        next_log_hash = log->previous_hash;
         {
             //Clean up transaction structure to prevent
             //toku_txn_close from double-freeing
             spilled_tail      = next_log;
-            spilled_tail_hash = next_log_hash;
             if (found_head) {
                 assert(next_log.b == ROLLBACK_NONE.b);
                 spilled_head      = next_log;
-                spilled_head_hash = next_log_hash;
             }
         }
         toku_rollback_log_unpin_and_remove(txn, log);
@@ -421,15 +415,13 @@ int
 toku_commit_rollinclude (TXNID_PAIR      xid,
                          uint64_t   num_nodes,
                          BLOCKNUM   spilled_head,
-                         uint32_t   spilled_head_hash,
                          BLOCKNUM   spilled_tail,
-                         uint32_t   spilled_tail_hash,
                          TOKUTXN    txn,
                          LSN        oplsn) {
     int r;
     r = toku_apply_rollinclude(xid, num_nodes,
-                               spilled_head, spilled_head_hash,
-                               spilled_tail, spilled_tail_hash,
+                               spilled_head,
+                               spilled_tail,
                                txn, oplsn,
                                toku_commit_rollback_item);
     return r;
@@ -439,15 +431,13 @@ int
 toku_rollback_rollinclude (TXNID_PAIR      xid,
                            uint64_t   num_nodes,
                            BLOCKNUM   spilled_head,
-                           uint32_t   spilled_head_hash,
                            BLOCKNUM   spilled_tail,
-                           uint32_t   spilled_tail_hash,
                            TOKUTXN    txn,
                            LSN        oplsn) {
     int r;
     r = toku_apply_rollinclude(xid, num_nodes,
-                               spilled_head, spilled_head_hash,
-                               spilled_tail, spilled_tail_hash,
+                               spilled_head,
+                               spilled_tail,
                                txn, oplsn,
                                toku_abort_rollback_item);
     return r;

ft/rollback-apply.cc

@@ -143,17 +143,14 @@ apply_txn(TOKUTXN txn, LSN lsn, apply_rollback_item func) {
     //printf("%s:%d abort\n", __FILE__, __LINE__);
 
     BLOCKNUM next_log      = ROLLBACK_NONE;
-    uint32_t next_log_hash = 0;
 
     bool is_current = false;
     if (txn_has_current_rollback_log(txn)) {
         next_log      = txn->roll_info.current_rollback;
-        next_log_hash = txn->roll_info.current_rollback_hash;
         is_current = true;
     }
     else if (txn_has_spilled_rollback_logs(txn)) {
         next_log      = txn->roll_info.spilled_rollback_tail;
-        next_log_hash = txn->roll_info.spilled_rollback_tail_hash;
     }
 
     uint64_t last_sequence = txn->roll_info.num_rollback_nodes;
@@ -161,7 +158,7 @@ apply_txn(TOKUTXN txn, LSN lsn, apply_rollback_item func) {
     while (next_log.b != ROLLBACK_NONE.b) {
         ROLLBACK_LOG_NODE log;
         //pin log
-        toku_get_and_pin_rollback_log(txn, next_log, next_log_hash, &log);
+        toku_get_and_pin_rollback_log(txn, next_log, &log);
         toku_rollback_verify_contents(log, txn->txnid, last_sequence - 1);
 
         toku_maybe_prefetch_previous_rollback_log(txn, log);
@@ -180,23 +177,19 @@ apply_txn(TOKUTXN txn, LSN lsn, apply_rollback_item func) {
             assert(log->sequence == 0);
         }
         next_log      = log->previous;
-        next_log_hash = log->previous_hash;
         {
             //Clean up transaction structure to prevent
             //toku_txn_close from double-freeing
             if (is_current) {
                 txn->roll_info.current_rollback      = ROLLBACK_NONE;
-                txn->roll_info.current_rollback_hash = 0;
                 is_current = false;
             }
             else {
                 txn->roll_info.spilled_rollback_tail      = next_log;
-                txn->roll_info.spilled_rollback_tail_hash = next_log_hash;
             }
             if (found_head) {
                 assert(next_log.b == ROLLBACK_NONE.b);
                 txn->roll_info.spilled_rollback_head      = next_log;
-                txn->roll_info.spilled_rollback_head_hash = next_log_hash;
             }
         }
         bool give_back = false;
@@ -228,13 +221,11 @@ int toku_rollback_commit(TOKUTXN txn, LSN lsn) {
                 num_nodes--; //Don't count the in-progress rollback log.
             }
             toku_logger_save_rollback_rollinclude(txn->parent, txn->txnid, num_nodes,
-                                                      txn->roll_info.spilled_rollback_head, txn->roll_info.spilled_rollback_head_hash,
-                                                      txn->roll_info.spilled_rollback_tail, txn->roll_info.spilled_rollback_tail_hash);
+                                                      txn->roll_info.spilled_rollback_head,
+                                                      txn->roll_info.spilled_rollback_tail);
             //Remove ownership from child.
             txn->roll_info.spilled_rollback_head      = ROLLBACK_NONE; 
-            txn->roll_info.spilled_rollback_head_hash = 0; 
             txn->roll_info.spilled_rollback_tail      = ROLLBACK_NONE; 
-            txn->roll_info.spilled_rollback_tail_hash = 0; 
         }
         // if we're commiting a child rollback, put its entries into the parent
         // by pinning both child and parent and then linking the child log entry
@@ -247,8 +238,7 @@ int toku_rollback_commit(TOKUTXN txn, LSN lsn) {
 
             //Pin child log
             ROLLBACK_LOG_NODE child_log;
-            toku_get_and_pin_rollback_log(txn, txn->roll_info.current_rollback, 
-                    txn->roll_info.current_rollback_hash, &child_log);
+            toku_get_and_pin_rollback_log(txn, txn->roll_info.current_rollback, &child_log);
             toku_rollback_verify_contents(child_log, txn->txnid, txn->roll_info.num_rollback_nodes - 1);
 
             // Append the list to the front of the parent.
@@ -284,7 +274,6 @@ int toku_rollback_commit(TOKUTXN txn, LSN lsn) {
                 toku_rollback_log_unpin_and_remove(txn, child_log);
             }
             txn->roll_info.current_rollback = ROLLBACK_NONE;
-            txn->roll_info.current_rollback_hash = 0;
 
             toku_maybe_spill_rollbacks(txn->parent, parent_log);
             toku_rollback_log_unpin(txn->parent, parent_log);

ft/rollback-ct-callbacks.cc

@@ -219,13 +219,13 @@ void toku_rollback_flush_callback (
     }
 }
 
-int toku_rollback_fetch_callback (CACHEFILE cachefile, PAIR p, int fd, BLOCKNUM logname, uint32_t fullhash,
+int toku_rollback_fetch_callback (CACHEFILE cachefile, PAIR p, int fd, BLOCKNUM logname, uint32_t fullhash UU(),
                                  void **rollback_pv,  void** UU(disk_data), PAIR_ATTR *sizep, int * UU(dirtyp), void *extraargs) {
     int r;
     FT CAST_FROM_VOIDP(h, extraargs);
     assert(h->cf == cachefile);
     ROLLBACK_LOG_NODE *result = (ROLLBACK_LOG_NODE*)rollback_pv;
-    r = toku_deserialize_rollback_log_from(fd, logname, fullhash, result, h);
+    r = toku_deserialize_rollback_log_from(fd, logname, result, h);
     if (r==0) {
         (*result)->ct_pair = p;
         *sizep = rollback_memory_size(*result);

ft/rollback.cc

@@ -158,7 +158,7 @@ static void toku_rollback_node_save_ct_pair(CACHEKEY UU(key), void *value_data,
 
 //
 // initializes an empty rollback log node
-// Does not touch the blocknum or hash, that is the
+// Does not touch the blocknum, that is the
 // responsibility of the caller
 //
 void rollback_empty_log_init(ROLLBACK_LOG_NODE log) {
@@ -173,7 +173,6 @@ void rollback_empty_log_init(ROLLBACK_LOG_NODE log) {
     log->dirty = true;
     log->sequence = 0;
     log->previous = make_blocknum(0);
-    log->previous_hash = 0;
     log->oldest_logentry = NULL;
     log->newest_logentry = NULL;
     log->rollentry_arena = NULL;
@@ -185,14 +184,12 @@ void rollback_empty_log_init(ROLLBACK_LOG_NODE log) {
 static void rollback_initialize_for_txn(
     ROLLBACK_LOG_NODE log,
     TOKUTXN txn,
-    BLOCKNUM previous,
-    uint32_t previous_hash
+    BLOCKNUM previous
     )
 {
     log->txnid = txn->txnid;
     log->sequence = txn->roll_info.num_rollback_nodes++;
     log->previous = previous;
-    log->previous_hash = previous_hash;
     log->oldest_logentry = NULL;
     log->newest_logentry = NULL;
     log->rollentry_arena = memarena_create();
@@ -206,12 +203,11 @@ void make_rollback_log_empty(ROLLBACK_LOG_NODE log) {
 }
 
 // create and pin a new rollback log node. chain it to the other rollback nodes
-// by providing a previous blocknum/ hash and assigning the new rollback log
+// by providing a previous blocknum and assigning the new rollback log
 // node the next sequence number
 static void rollback_log_create (
     TOKUTXN txn,
     BLOCKNUM previous,
-    uint32_t previous_hash,
     ROLLBACK_LOG_NODE *result
     )
 {
@@ -220,16 +216,15 @@ static void rollback_log_create (
 
     CACHEFILE cf = txn->logger->rollback_cachefile;
     FT CAST_FROM_VOIDP(ft, toku_cachefile_get_userdata(cf));
-    rollback_initialize_for_txn(log, txn, previous, previous_hash);
+    rollback_initialize_for_txn(log, txn, previous);
     toku_allocate_blocknum(ft->blocktable, &log->blocknum, ft);
-    log->hash = toku_cachetable_hash(ft->cf, log->blocknum);
+    const uint32_t hash = toku_cachetable_hash(ft->cf, log->blocknum);
     *result = log;
-    toku_cachetable_put(cf, log->blocknum, log->hash,
+    toku_cachetable_put(cf, log->blocknum, hash,
                        log, rollback_memory_size(log),
                        get_write_callbacks_for_rollback_log(ft),
                        toku_rollback_node_save_ct_pair);
     txn->roll_info.current_rollback = log->blocknum;
-    txn->roll_info.current_rollback_hash = log->hash;
 }
 
 void toku_rollback_log_unpin(TOKUTXN txn, ROLLBACK_LOG_NODE log) {
@@ -255,14 +250,11 @@ void toku_maybe_spill_rollbacks(TOKUTXN txn, ROLLBACK_LOG_NODE log) {
         if (!txn_has_spilled_rollback_logs(txn)) {
             //First spilled.  Copy to head.
             txn->roll_info.spilled_rollback_head      = txn->roll_info.current_rollback;
-            txn->roll_info.spilled_rollback_head_hash = txn->roll_info.current_rollback_hash;
         }
         //Unconditionally copy to tail.  Old tail does not need to be cached anymore.
         txn->roll_info.spilled_rollback_tail      = txn->roll_info.current_rollback;
-        txn->roll_info.spilled_rollback_tail_hash = txn->roll_info.current_rollback_hash;
 
         txn->roll_info.current_rollback      = ROLLBACK_NONE;
-        txn->roll_info.current_rollback_hash = 0;
     }
 }
 
@@ -311,8 +303,8 @@ void toku_maybe_prefetch_previous_rollback_log(TOKUTXN txn, ROLLBACK_LOG_NODE lo
     BLOCKNUM name = log->previous;
     int r = 0;
     if (name.b != ROLLBACK_NONE.b) {
-        uint32_t hash = log->previous_hash;
         CACHEFILE cf = txn->logger->rollback_cachefile;
+        uint32_t hash = toku_cachetable_hash(cf, name);
         FT CAST_FROM_VOIDP(h, toku_cachefile_get_userdata(cf));
         bool doing_prefetch = false;
         r = toku_cachefile_prefetch(cf, name, hash,
@@ -334,10 +326,11 @@ void toku_rollback_verify_contents(ROLLBACK_LOG_NODE log,
     assert(log->sequence == sequence);
 }
 
-void toku_get_and_pin_rollback_log(TOKUTXN txn, BLOCKNUM blocknum, uint32_t hash, ROLLBACK_LOG_NODE *log) {
+void toku_get_and_pin_rollback_log(TOKUTXN txn, BLOCKNUM blocknum, ROLLBACK_LOG_NODE *log) {
     void * value;
     CACHEFILE cf = txn->logger->rollback_cachefile;
     FT CAST_FROM_VOIDP(h, toku_cachefile_get_userdata(cf));
+    uint32_t hash = toku_cachetable_hash(cf, blocknum);
     int r = toku_cachetable_get_and_pin_with_dep_pairs(cf, blocknum, hash,
                                         &value, NULL,
                                         get_write_callbacks_for_rollback_log(h),
@@ -351,7 +344,6 @@ void toku_get_and_pin_rollback_log(TOKUTXN txn, BLOCKNUM blocknum, uint32_t hash
     assert(r == 0);
     ROLLBACK_LOG_NODE CAST_FROM_VOIDP(pinned_log, value);
     assert(pinned_log->blocknum.b == blocknum.b);
-    assert(pinned_log->hash == hash);
     *log = pinned_log;
 }
 
@@ -359,7 +351,7 @@ void toku_get_and_pin_rollback_log_for_new_entry (TOKUTXN txn, ROLLBACK_LOG_NODE
     ROLLBACK_LOG_NODE pinned_log = NULL;
     invariant(txn->state == TOKUTXN_LIVE || txn->state == TOKUTXN_PREPARING); // hot indexing may call this function for prepared transactions
     if (txn_has_current_rollback_log(txn)) {
-        toku_get_and_pin_rollback_log(txn, txn->roll_info.current_rollback, txn->roll_info.current_rollback_hash, &pinned_log);
+        toku_get_and_pin_rollback_log(txn, txn->roll_info.current_rollback, &pinned_log);
         toku_rollback_verify_contents(pinned_log, txn->txnid, txn->roll_info.num_rollback_nodes - 1);
     } else {
         // For each transaction, we try to acquire the first rollback log
@@ -378,15 +370,13 @@ void toku_get_and_pin_rollback_log_for_new_entry (TOKUTXN txn, ROLLBACK_LOG_NODE
                 rollback_initialize_for_txn(
                     pinned_log,
                     txn,
-                    txn->roll_info.spilled_rollback_tail,
-                    txn->roll_info.spilled_rollback_tail_hash
+                    txn->roll_info.spilled_rollback_tail
                     );
                 txn->roll_info.current_rollback = pinned_log->blocknum;
-                txn->roll_info.current_rollback_hash = pinned_log->hash;
             }
         }
         if (pinned_log == NULL) {
-            rollback_log_create(txn, txn->roll_info.spilled_rollback_tail, txn->roll_info.spilled_rollback_tail_hash, &pinned_log);
+            rollback_log_create(txn, txn->roll_info.spilled_rollback_tail, &pinned_log);
         }
     }
     assert(pinned_log->txnid.parent_id64 == txn->txnid.parent_id64);

ft/rollback.h

@@ -103,8 +103,8 @@ void toku_poll_txn_progress_function(TOKUTXN txn, uint8_t is_commit, uint8_t sta
 // is a current rollback node to use, pin it, otherwise create one.
 void toku_get_and_pin_rollback_log_for_new_entry(TOKUTXN txn, ROLLBACK_LOG_NODE *log);
 
-// get a specific rollback by blocknum and hash
-void toku_get_and_pin_rollback_log(TOKUTXN txn, BLOCKNUM blocknum, uint32_t hash, ROLLBACK_LOG_NODE *log);
+// get a specific rollback by blocknum
+void toku_get_and_pin_rollback_log(TOKUTXN txn, BLOCKNUM blocknum, ROLLBACK_LOG_NODE *log);
 
 // unpin a rollback node from the cachetable
 void toku_rollback_log_unpin(TOKUTXN txn, ROLLBACK_LOG_NODE log);
@@ -155,11 +155,9 @@ struct rollback_log_node {
     // the sequence is between 0 and totalnodes-1
     uint64_t           sequence;
     BLOCKNUM           blocknum; // on which block does this node live?
-    uint32_t           hash;
     // which block number is the previous in the chain of rollback nodes 
     // that make up this rollback log?
     BLOCKNUM           previous; 
-    uint32_t           previous_hash;
     struct roll_entry *oldest_logentry;
     struct roll_entry *newest_logentry;
     MEMARENA           rollentry_arena;

ft/rollback_log_node_cache.cc

@@ -96,7 +96,6 @@ PATENT RIGHTS GRANT:
 
 void rollback_log_node_cache::init (uint32_t max_num_avail_nodes) {
     XMALLOC_N(max_num_avail_nodes, m_avail_blocknums);
-    XMALLOC_N(max_num_avail_nodes, m_hashes);
     m_max_num_avail = max_num_avail_nodes;
     m_first = 0;
     m_num_avail = 0;
@@ -110,7 +109,6 @@ void rollback_log_node_cache::init (uint32_t max_num_avail_nodes) {
 void rollback_log_node_cache::destroy() {
     toku_mutex_destroy(&m_mutex);
     toku_free(m_avail_blocknums);
-    toku_free(m_hashes);
 }
 
 // returns true if rollback log node was successfully added,
@@ -125,7 +123,6 @@ bool rollback_log_node_cache::give_rollback_log_node(TOKUTXN txn, ROLLBACK_LOG_N
             index -= m_max_num_avail;
         }
         m_avail_blocknums[index].b = log->blocknum.b;
-        m_hashes[index] = log->hash;
         m_num_avail++;
     }
     toku_mutex_unlock(&m_mutex);
@@ -144,11 +141,9 @@ bool rollback_log_node_cache::give_rollback_log_node(TOKUTXN txn, ROLLBACK_LOG_N
 // for getting a rollback log node
 void rollback_log_node_cache::get_rollback_log_node(TOKUTXN txn, ROLLBACK_LOG_NODE* log){
     BLOCKNUM b = ROLLBACK_NONE;
-    uint32_t hash;
     toku_mutex_lock(&m_mutex);
     if (m_num_avail > 0) {
         b.b = m_avail_blocknums[m_first].b;
-        hash = m_hashes[m_first];
         m_num_avail--;
         if (++m_first >= m_max_num_avail) {
             m_first = 0;
@@ -156,7 +151,7 @@ void rollback_log_node_cache::get_rollback_log_node(TOKUTXN txn, ROLLBACK_LOG_NO
     }
     toku_mutex_unlock(&m_mutex);
     if (b.b != ROLLBACK_NONE.b) {
-        toku_get_and_pin_rollback_log(txn, b, hash, log);
+        toku_get_and_pin_rollback_log(txn, b, log);
         invariant(rollback_log_is_unused(*log));
     } else {
         *log = NULL;

ft/rollback_log_node_cache.h

@@ -108,7 +108,6 @@ class rollback_log_node_cache {
 
 private:
     BLOCKNUM* m_avail_blocknums;
-    uint32_t* m_hashes;
     uint32_t m_first;
     uint32_t m_num_avail;
     uint32_t m_max_num_avail;

ft/txn.cc

@@ -308,11 +308,8 @@ static void toku_txn_create_txn (
         .num_rollentries_processed = 0,
         .rollentry_raw_count = 0,
         .spilled_rollback_head = ROLLBACK_NONE,
-        .spilled_rollback_head_hash = 0,
         .spilled_rollback_tail = ROLLBACK_NONE,
-        .spilled_rollback_tail_hash = 0,
         .current_rollback = ROLLBACK_NONE,
-        .current_rollback_hash = 0,
     };
 
 static txn_child_manager tcm;
@@ -405,17 +402,9 @@ toku_txn_load_txninfo (TOKUTXN txn, TXNINFO info) {
     txn->roll_info.num_rollback_nodes = info->num_rollback_nodes;
     txn->roll_info.num_rollentries = info->num_rollentries;
 
-    CACHEFILE rollback_cachefile = txn->logger->rollback_cachefile;
-
     txn->roll_info.spilled_rollback_head = info->spilled_rollback_head;
-    txn->roll_info.spilled_rollback_head_hash = toku_cachetable_hash(rollback_cachefile,
-                                                           txn->roll_info.spilled_rollback_head);
     txn->roll_info.spilled_rollback_tail = info->spilled_rollback_tail;
-    txn->roll_info.spilled_rollback_tail_hash = toku_cachetable_hash(rollback_cachefile,
-                                                           txn->roll_info.spilled_rollback_tail);
     txn->roll_info.current_rollback = info->current_rollback;
-    txn->roll_info.current_rollback_hash = toku_cachetable_hash(rollback_cachefile,
-                                                      txn->roll_info.current_rollback);
     return 0;
 }