[t:3219] Merge the 3219 fixes onto the main line. Refs #3219.

{{{
svn merge -r28558:28575 https://svn.tokutek.com/tokudb/toku/tokudb.3219c
}}}
.


git-svn-id: file:///svn/toku/tokudb@28588 c7de825b-a66e-492c-adef-691d508d4ae1

newbrt/brt.c

@@ -1889,7 +1889,6 @@ static int brt_nonleaf_cmd_once (BRT t, BRTNODE node, BRT_MSG cmd,
 
     verify_local_fingerprint_nonleaf(node);
 
-    verify_local_fingerprint_nonleaf(node);
     /* find the right subtree */
     //TODO: accesses key, val directly
     unsigned int childnum = toku_brtnode_which_child(node, cmd->u.id.key, t);
@@ -4558,7 +4557,7 @@ got_a_good_value:
 }
 
 static int
-brt_search_node (BRT brt, BRTNODE node, brt_search_t *search, BRT_GET_CALLBACK_FUNCTION getf, void *getf_v, enum reactivity *re, BOOL *doprefetch, BRT_CURSOR brtcursor);
+brt_search_node (BRT brt, BRTNODE node, brt_search_t *search, BRT_GET_CALLBACK_FUNCTION getf, void *getf_v, enum reactivity *re, BOOL *doprefetch, BRT_CURSOR brtcursor, UNLOCKERS unlockers);
 
 // the number of nodes to prefetch
 #define TOKU_DO_PREFETCH 2
@@ -4586,9 +4585,24 @@ brt_node_maybe_prefetch(BRT brt, BRTNODE node, int childnum, BRT_CURSOR brtcurso
 
 #endif
 
+struct unlock_brtnode_extra {
+    BRT brt;
+    BRTNODE node;
+};
+// When this is called, the cachetable lock is held
+static void
+unlock_brtnode_fun (void *v) {
+    struct unlock_brtnode_extra *x = v;
+    BRT brt = x->brt;
+    BRTNODE node = x->node;
+    // CT lock is held
+    int r = toku_cachetable_unpin_ct_prelocked(brt->cf, node->thisnodename, node->fullhash, (enum cachetable_dirty) node->dirty, brtnode_memory_size(node));
+    assert(r==0);
+}
+
 /* search in a node's child */
 static int
-brt_search_child(BRT brt, BRTNODE node, int childnum, brt_search_t *search, BRT_GET_CALLBACK_FUNCTION getf, void *getf_v, enum reactivity *parent_re, BOOL *doprefetch, BRT_CURSOR brtcursor, BOOL *did_react)
+brt_search_child(BRT brt, BRTNODE node, int childnum, brt_search_t *search, BRT_GET_CALLBACK_FUNCTION getf, void *getf_v, enum reactivity *parent_re, BOOL *doprefetch, BRT_CURSOR brtcursor, BOOL *did_react, UNLOCKERS unlockers)
 // Effect: Search in a node's child.
 //  If we change the shape, set *did_react = TRUE.  Else set *did_react = FALSE.
 {
@@ -4608,46 +4622,55 @@ brt_search_child(BRT brt, BRTNODE node, int childnum, brt_search_t *search, BRT_
     BLOCKNUM childblocknum = BNC_BLOCKNUM(node,childnum);
     u_int32_t fullhash =  compute_child_fullhash(brt->cf, node, childnum);
     {
-        int rr = toku_cachetable_get_and_pin_nonblocking(brt->cf, childblocknum, fullhash, &node_v, NULL, toku_brtnode_flush_callback, toku_brtnode_fetch_callback, brt->h);
+        int rr = toku_cachetable_get_and_pin_nonblocking(brt->cf, childblocknum, fullhash, &node_v, NULL, toku_brtnode_flush_callback, toku_brtnode_fetch_callback, brt->h, unlockers);
 	if (rr==TOKUDB_TRY_AGAIN) return rr;
         lazy_assert_zero(rr);
     }
 
     BRTNODE childnode = node_v;
+
+    struct unlock_brtnode_extra unlock_extra   = {brt,childnode};
+    struct unlockers            next_unlockers = {TRUE, unlock_brtnode_fun, (void*)&unlock_extra, unlockers};
+
     verify_local_fingerprint_nonleaf(node);
     verify_local_fingerprint_nonleaf(childnode);
     enum reactivity child_re = RE_STABLE;
-    int r = brt_search_node(brt, childnode, search, getf, getf_v, &child_re, doprefetch, brtcursor);
-    // Even if r is reactive, we want to handle the maybe reactive child.
-    verify_local_fingerprint_nonleaf(node);
-    verify_local_fingerprint_nonleaf(childnode);
+    int r = brt_search_node(brt, childnode, search, getf, getf_v, &child_re, doprefetch, brtcursor, &next_unlockers);
+    if (r!=TOKUDB_TRY_AGAIN) {
+	// Even if r is reactive, we want to handle the maybe reactive child.
+	verify_local_fingerprint_nonleaf(node);
+	verify_local_fingerprint_nonleaf(childnode);
 
 #if TOKU_DO_PREFETCH
-    // maybe prefetch the next child
-    if (r == 0)
-        brt_node_maybe_prefetch(brt, node, childnum, brtcursor, doprefetch);
+	// maybe prefetch the next child
+	if (r == 0)
+	    brt_node_maybe_prefetch(brt, node, childnum, brtcursor, doprefetch);
 #endif
 
-    {
-        int rr = toku_unpin_brtnode(brt, childnode); // unpin the childnode before handling the reactive child (because that may make the childnode disappear.)
-        if (rr!=0) r = rr;
-    }
-
-    {
-        BOOL did_io = FALSE;
-        int rr = brt_handle_maybe_reactive_child(brt, node, childnum, child_re, &did_io, did_react);
-        if (rr!=0) r = rr; // if we got an error, then return rr.  Else we will return the r from brt_search_node().
-    }
+	assert(next_unlockers.locked);
+	{
+	    int rr = toku_unpin_brtnode(brt, childnode); // unpin the childnode before handling the reactive child (because that may make the childnode disappear.)
+	    if (rr!=0) r = rr;
+	}
+	{
+	    BOOL did_io = FALSE;
+	    int rr = brt_handle_maybe_reactive_child(brt, node, childnum, child_re, &did_io, did_react);
+	    if (rr!=0) r = rr; // if we got an error, then return rr.  Else we will return the r from brt_search_node().
+	}
 
-    *parent_re = get_nonleaf_reactivity(node);
+	*parent_re = get_nonleaf_reactivity(node);
 
-    verify_local_fingerprint_nonleaf(node);
+	verify_local_fingerprint_nonleaf(node);
+    } else {
+	// try again.
+	assert(!next_unlockers.locked);
+    }
 
     return r;
 }
 
 static int
-brt_search_nonleaf_node(BRT brt, BRTNODE node, brt_search_t *search, BRT_GET_CALLBACK_FUNCTION getf, void *getf_v, enum reactivity *re, BOOL *doprefetch, BRT_CURSOR brtcursor)
+brt_search_nonleaf_node(BRT brt, BRTNODE node, brt_search_t *search, BRT_GET_CALLBACK_FUNCTION getf, void *getf_v, enum reactivity *re, BOOL *doprefetch, BRT_CURSOR brtcursor, UNLOCKERS unlockers)
 {
     int count=0;
  again:
@@ -4672,10 +4695,10 @@ brt_search_nonleaf_node(BRT brt, BRTNODE node, brt_search_t *search, BRT_GET_CAL
                                 toku_fill_dbt(&pivotkey, kv_pair_key(pivot), kv_pair_keylen(pivot)))) {
                 BOOL did_change_shape = FALSE;
                 verify_local_fingerprint_nonleaf(node);
-                int r = brt_search_child(brt, node, child[c], search, getf, getf_v, re, doprefetch, brtcursor, &did_change_shape);
+                int r = brt_search_child(brt, node, child[c], search, getf, getf_v, re, doprefetch, brtcursor, &did_change_shape, unlockers);
                 lazy_assert(r != EAGAIN);
                 if (r == 0) return r;           //Success
-                if (r != DB_NOTFOUND) return r; //Error (or message to quit early, such as TOKUDB_FOUND_BUT_REJECTED)
+                if (r != DB_NOTFOUND) return r; //Error (or message to quit early, such as TOKUDB_FOUND_BUT_REJECTED or TOKUDB_TRY_AGAIN)
                 if (did_change_shape) goto again;
             }
         }
@@ -4683,16 +4706,16 @@ brt_search_nonleaf_node(BRT brt, BRTNODE node, brt_search_t *search, BRT_GET_CAL
         /* check the first (left) or last (right) node if nothing has been found */
         BOOL ignore_did_change_shape; // ignore this
         verify_local_fingerprint_nonleaf(node);
-        return brt_search_child(brt, node, child[c], search, getf, getf_v, re, doprefetch, brtcursor, &ignore_did_change_shape);
+        return brt_search_child(brt, node, child[c], search, getf, getf_v, re, doprefetch, brtcursor, &ignore_did_change_shape, unlockers);
     }
 }
 
 static int
-brt_search_node (BRT brt, BRTNODE node, brt_search_t *search, BRT_GET_CALLBACK_FUNCTION getf, void *getf_v, enum reactivity *re, BOOL *doprefetch, BRT_CURSOR brtcursor)
+brt_search_node (BRT brt, BRTNODE node, brt_search_t *search, BRT_GET_CALLBACK_FUNCTION getf, void *getf_v, enum reactivity *re, BOOL *doprefetch, BRT_CURSOR brtcursor, UNLOCKERS unlockers)
 {
     verify_local_fingerprint_nonleaf(node);
     if (node->height > 0)
-        return brt_search_nonleaf_node(brt, node, search, getf, getf_v, re, doprefetch, brtcursor);
+        return brt_search_nonleaf_node(brt, node, search, getf, getf_v, re, doprefetch, brtcursor, unlockers);
     else {
         return brt_search_leaf_node(node, search, getf, getf_v, re, doprefetch, brtcursor);
     }
@@ -4723,21 +4746,30 @@ toku_brt_search (BRT brt, brt_search_t *search, BRT_GET_CALLBACK_FUNCTION getf,
 
     BRTNODE node = node_v;
 
+    struct unlock_brtnode_extra unlock_extra   = {brt,node};
+    struct unlockers            unlockers      = {TRUE, unlock_brtnode_fun, (void*)&unlock_extra, (UNLOCKERS)NULL};
+
     {
         enum reactivity re = RE_STABLE;
         BOOL doprefetch = FALSE;
         //static int counter = 0;        counter++;
-        r = brt_search_node(brt, node, search, getf, getf_v, &re, &doprefetch, brtcursor);
+        r = brt_search_node(brt, node, search, getf, getf_v, &re, &doprefetch, brtcursor, &unlockers);
+	if (r==TOKUDB_TRY_AGAIN) {
+	    assert(!unlockers.locked);
+	    goto try_again;
+	} else {
+	    assert(unlockers.locked);
+	}
         if (r!=0) goto return_r;
 
         r = brt_handle_maybe_reactive_child_at_root(brt, rootp, &node, re);
     }
 
  return_r:
+    assert(unlockers.locked);
     rr = toku_unpin_brtnode(brt, node);
     lazy_assert_zero(rr);
 
-    if (r==TOKUDB_TRY_AGAIN) goto try_again;
 
     //Heaviside function (+direction) queries define only a lower or upper
     //bound.  Some queries require both an upper and lower bound.

newbrt/cachetable.c

@@ -1600,7 +1600,8 @@ int toku_cachetable_maybe_get_and_pin_clean (CACHEFILE cachefile, CACHEKEY key,
 }
 
 
-int toku_cachetable_unpin(CACHEFILE cachefile, CACHEKEY key, u_int32_t fullhash, enum cachetable_dirty dirty, long size)
+static int
+toku_cachetable_unpin_internal(CACHEFILE cachefile, CACHEKEY key, u_int32_t fullhash, enum cachetable_dirty dirty, long size, BOOL have_ct_lock)
 // size==0 means that the size didn't change.
 {
     CACHETABLE ct = cachefile->cachetable;
@@ -1610,7 +1611,7 @@ int toku_cachetable_unpin(CACHEFILE cachefile, CACHEKEY key, u_int32_t fullhash,
     int count = 0;
     int r = -1;
     //assert(fullhash == toku_cachetable_hash(cachefile, key));
-    cachetable_lock(ct);
+    if (!have_ct_lock) cachetable_lock(ct);
     for (p=ct->table[fullhash&(ct->table_size-1)]; p; p=p->hash_chain) {
 	count++;
 	if (p->key.b==key.b && p->cachefile==cachefile) {
@@ -1634,16 +1635,36 @@ int toku_cachetable_unpin(CACHEFILE cachefile, CACHEKEY key, u_int32_t fullhash,
 	}
     }
     note_hash_count(count);
-    cachetable_unlock(ct);
+    if (!have_ct_lock) cachetable_unlock(ct);
     return r;
 }
 
+int toku_cachetable_unpin(CACHEFILE cachefile, CACHEKEY key, u_int32_t fullhash, enum cachetable_dirty dirty, long size) {
+    // By default we don't have the lock
+    return toku_cachetable_unpin_internal(cachefile, key, fullhash, dirty, size, FALSE);
+}
+int toku_cachetable_unpin_ct_prelocked(CACHEFILE cachefile, CACHEKEY key, u_int32_t fullhash, enum cachetable_dirty dirty, long size) {
+    // By default we don't have the lock
+    return toku_cachetable_unpin_internal(cachefile, key, fullhash, dirty, size, TRUE);
+}
+
+static void
+run_unlockers (UNLOCKERS unlockers) {
+    while (unlockers) {
+	assert(unlockers->locked);
+	unlockers->locked = FALSE;
+	unlockers->f(unlockers->extra);
+	unlockers=unlockers->next;
+    }
+}
+
 int toku_cachetable_get_and_pin_nonblocking (CACHEFILE cf, CACHEKEY key, u_int32_t fullhash, void**value, long *sizep,
 					     CACHETABLE_FLUSH_CALLBACK flush_callback, 
-					     CACHETABLE_FETCH_CALLBACK fetch_callback, void *extraargs)
+					     CACHETABLE_FETCH_CALLBACK fetch_callback, void *extraargs,
+					     UNLOCKERS unlockers)
 // Effect:  If the block is in the cachetable, then pin it and return it. 
 //   Otherwise call the lock_unlock_callback (to unlock), fetch the data (but don't pin it, since we'll just end up pinning it again later),  and the call (to lock)
-//   and return TOKU_DB_TRYAGAIN.
+//   and return TOKUDB_TRY_AGAIN.
 {
     CACHETABLE ct = cf->cachetable;
     cachetable_lock(ct);
@@ -1670,9 +1691,11 @@ int toku_cachetable_get_and_pin_nonblocking (CACHEFILE cf, CACHEKEY key, u_int32
 	    case CTPAIR_INVALID: assert(0);
 	    case CTPAIR_READING:
 	    case CTPAIR_WRITING:
+		run_unlockers(unlockers); // The contract says the unlockers are run with the ct lock being held.
 		if (ct->ydb_unlock_callback) ct->ydb_unlock_callback();
+		// Now wait for the I/O to occur.
 		// We need to obtain the read lock (waiting for the write to finish), but then we only waited so we could wake up again.  So rather than locking the read lock, and then releasing it we call this function.
-		rwlock_read_lock_and_unlock(&p->rwlock, ct->mutex); // recall that this lock releases and reacquires the ct->mutex.
+		rwlock_read_lock_and_unlock(&p->rwlock, ct->mutex); // recall that this lock releases and reacquires the ct->mutex, letting writers finish up first.
 		cachetable_unlock(ct);
 		if (ct->ydb_lock_callback) ct->ydb_lock_callback();
 		return TOKUDB_TRY_AGAIN;
@@ -1694,6 +1717,7 @@ int toku_cachetable_get_and_pin_nonblocking (CACHEFILE cf, CACHEKEY key, u_int32
     p = cachetable_insert_at(ct, cf, key, zero_value, CTPAIR_READING, fullhash, zero_size, flush_callback, fetch_callback, extraargs, CACHETABLE_CLEAN);
     assert(p);
     rwlock_write_lock(&p->rwlock, ct->mutex);
+    run_unlockers(unlockers); // we hold the ct mutex.
     if (ct->ydb_unlock_callback) ct->ydb_unlock_callback();
     int r = cachetable_fetch_pair(ct, cf, p);
     cachetable_unlock(ct);

newbrt/cachetable.h

@@ -165,12 +165,21 @@ int toku_cachetable_get_and_pin(CACHEFILE, CACHEKEY, u_int32_t /*fullhash*/,
 				CACHETABLE_FLUSH_CALLBACK flush_callback,
                                 CACHETABLE_FETCH_CALLBACK fetch_callback, void *extraargs);
 
+typedef struct unlockers *UNLOCKERS;
+struct unlockers {
+    BOOL       locked;
+    void (*f)(void*extra);
+    void      *extra;
+    UNLOCKERS  next;
+};
+
 // Effect:  If the block is in the cachetable, then return it. 
-//   Otherwise call the release_lock_callback, fetch the data (but don't pin it, since we'll just end up pinning it again later),
+//   Otherwise call the release_lock_callback, call the functions in unlockers, fetch the data (but don't pin it, since we'll just end up pinning it again later),
 //   and return TOKU_DB_TRYAGAIN.
 int toku_cachetable_get_and_pin_nonblocking (CACHEFILE cachefile, CACHEKEY key, u_int32_t fullhash, void**value, long *sizep,
 					     CACHETABLE_FLUSH_CALLBACK flush_callback, 
-					     CACHETABLE_FETCH_CALLBACK fetch_callback, void *extraargs);
+					     CACHETABLE_FETCH_CALLBACK fetch_callback, void *extraargs,
+					     UNLOCKERS unlockers);
 #define CAN_RELEASE_LOCK_DURING_IO
 
 // Maybe get and pin a memory object.
@@ -189,11 +198,16 @@ enum cachetable_dirty {
     CACHETABLE_DIRTY=1, // the cached object is dirty WRT the cachefile
 };
 
-// Unpin a memory object
+int toku_cachetable_unpin(CACHEFILE, CACHEKEY, u_int32_t fullhash, enum cachetable_dirty dirty, long size);
+// Effect: Unpin a memory object
 // Effects: If the memory object is in the cachetable, then OR the dirty flag,
 // update the size, and release the read lock on the memory object.
 // Returns: 0 if success, otherwise returns an error number.
-int toku_cachetable_unpin(CACHEFILE, CACHEKEY, u_int32_t fullhash, enum cachetable_dirty dirty, long size);
+// Requires: The ct is locked.
+
+int toku_cachetable_unpin_ct_prelocked(CACHEFILE, CACHEKEY, u_int32_t fullhash, enum cachetable_dirty dirty, long size);
+// Effect: The same as tokud_cachetable_unpin, except that the ct must not be locked.
+// Requires: The ct is NOT locked.
 
 int toku_cachetable_unpin_and_remove (CACHEFILE, CACHEKEY); /* Removing something already present is OK. */
 // Effect: Remove an object from the cachetable.  Don't write it back.

src/tests/Makefile

@@ -37,7 +37,6 @@ TRANSPARENT_UPGRADE_SRCS = $(wildcard upgrade*.c)
 NONSTANDARD_SRCS= \
 		  $(RECOVER_SRCS) \
 		  $(LOADER_SRCS) \
-	          test3219.c \
 
 SRCS = $(sort $(wildcard *.c))
 # To patch out upgrade tests, replace line above with line below

src/tests/test3219.c

@@ -14,8 +14,8 @@
 #include <pthread.h>
 
 
-DB_ENV *env;
-DB *db;
+static DB_ENV *env;
+static DB *db;
 
 static void
 insert(int i, DB_TXN *txn)
@@ -52,7 +52,7 @@ lookup(int i, DB_TXN *txn)
 }
 
 #define N_ROWS 1000000
-#define N_TXNS 1000000
+#define N_TXNS 10000
 #define N_ROWS_PER_TXN 1
 
 #define INITIAL_SIZE 1000
@@ -112,8 +112,10 @@ static void*
 start_b (void *arg __attribute__((__unused__))) {
     int r;
     for (int j=0; j<N_TXNS; j++) {
-	printf("."); fflush(stdout);
-	if (j%(N_TXNS/10)==0) printf("\n");
+	if (verbose) {
+	    printf("."); fflush(stdout);
+	    if (j%(N_TXNS/10)==0) printf("\n");
+	}
 	DB_TXN *txn;
 	r = env->txn_begin(env, 0, &txn, 0);                                              CKERR(r);
 	for (int i=0; i<N_ROWS_PER_TXN; i++) {
@@ -160,8 +162,9 @@ run_test (void)
     finish();
 }
 
-int test_main (int argc __attribute__((__unused__)), char*const argv[] __attribute__((__unused__))) {
+int test_main (int argc, char*const argv[]) {
+    parse_args(argc, argv);
     run_test();
-    printf("\n");
+    if (verbose) printf("\n");
     return 0;
 }