Set the queue to depth=2 for the extractor_thread. Refs #2571. [t:2571]

git-svn-id: file:///svn/toku/tokudb@20032 c7de825b-a66e-492c-adef-691d508d4ae1

newbrt/brtloader.c

@@ -330,7 +330,7 @@ int toku_brt_loader_open (/* out */ BRTLOADER *blp,
     brt_loader_init_poll_callback(&bl->poll_callback);
 
     { int r = init_rowset(&bl->primary_rowset); if (r!=0) return r; }
-    { int r = queue_create(&bl->primary_rowset_queue, 1); if (r!=0) return r; }
+    { int r = queue_create(&bl->primary_rowset_queue, 2); if (r!=0) return r; }
     //printf("%s:%d toku_pthread_create\n", __FILE__, __LINE__);
     { int r = toku_pthread_create(&bl->extractor_thread, NULL, extractor_thread, (void*)bl); if (r!=0) return r; }
     bl->extractor_live = TRUE;