diff --git a/mysql-test/r/ndb_update.result b/mysql-test/r/ndb_update.result
index 8166a554084..7603686ea35 100644
--- a/mysql-test/r/ndb_update.result
+++ b/mysql-test/r/ndb_update.result
@@ -17,6 +17,14 @@ pk1	b	c
 0	0	0
 2	2	2
 4	1	1
+UPDATE t1 set pk1 = 4 where pk1 = 2;
+ERROR 23000: Duplicate entry '4' for key 1
+UPDATE IGNORE t1 set pk1 = 4 where pk1 = 2;
+select * from t1 order by pk1;
+pk1	b	c
+0	0	0
+2	2	2
+4	1	1
 UPDATE t1 set pk1 = 1, c = 2 where pk1 = 4;
 ERROR 23000: Duplicate entry '' for key '*UNKNOWN*'
 select * from t1 order by pk1;
diff --git a/mysql-test/t/ndb_index_unique.test b/mysql-test/t/ndb_index_unique.test
index 94bba98662c..a1fd432a29a 100644
--- a/mysql-test/t/ndb_index_unique.test
+++ b/mysql-test/t/ndb_index_unique.test
@@ -91,7 +91,6 @@ select * from t2 order by a;
 
 drop table t2;
 
--- error 1121
 CREATE TABLE t2 (
   a int unsigned NOT NULL PRIMARY KEY,
   b int unsigned not null,
@@ -99,6 +98,20 @@ CREATE TABLE t2 (
   UNIQUE (b, c) USING HASH	
 ) engine=ndbcluster;
 
+
+insert t2 values(1,1,NULL),(2,2,2),(3,3,NULL),(4,4,4),(5,5,NULL),(6,6,6),(7,7,NULL),(8,3,NULL),(9,3,NULL);
+
+select * from t2 where c IS NULL order by a;
+select * from t2 where b = 3 AND c IS NULL order by a;
+select * from t2 where (b = 3 OR b = 5) AND c IS NULL order by a;
+set @old_ecpd = @@session.engine_condition_pushdown;
+set engine_condition_pushdown = true;
+explain select * from t2 where (b = 3 OR b = 5) AND c IS NULL AND a < 9 order by a;
+select * from t2 where (b = 3 OR b = 5) AND c IS NULL AND a < 9 order by a;
+set engine_condition_pushdown = @old_ecpd;
+
+drop table t2;
+
 #
 # Show use of PRIMARY KEY USING HASH indexes 
 #
diff --git a/mysql-test/t/ndb_update.test b/mysql-test/t/ndb_update.test
index 45e3add4639..5472dd95e9f 100644
--- a/mysql-test/t/ndb_update.test
+++ b/mysql-test/t/ndb_update.test
@@ -23,6 +23,10 @@ UPDATE t1 set b = c;
 select * from t1 order by pk1;
 UPDATE t1 set pk1 = 4 where pk1 = 1;
 select * from t1 order by pk1;
+--error 1062
+UPDATE t1 set pk1 = 4 where pk1 = 2;
+UPDATE IGNORE t1 set pk1 = 4 where pk1 = 2;
+select * from t1 order by pk1;
 -- error 1062
 UPDATE t1 set pk1 = 1, c = 2 where pk1 = 4;
 select * from t1 order by pk1;
diff --git a/storage/ndb/src/common/util/socket_io.cpp b/storage/ndb/src/common/util/socket_io.cpp
index deb62d1867a..74edbf94a6f 100644
--- a/storage/ndb/src/common/util/socket_io.cpp
+++ b/storage/ndb/src/common/util/socket_io.cpp
@@ -53,10 +53,6 @@ readln_socket(NDB_SOCKET_TYPE socket, int timeout_millis,
   if(buflen <= 1)
     return 0;
 
-  int sock_flags= fcntl(socket, F_GETFL);
-  if(fcntl(socket, F_SETFL, sock_flags | O_NONBLOCK) == -1)
-    return -1;
-
   fd_set readset;
   FD_ZERO(&readset);
   FD_SET(socket, &readset);
@@ -76,43 +72,65 @@ readln_socket(NDB_SOCKET_TYPE socket, int timeout_millis,
   }
 
   if(selectRes == -1){
-    fcntl(socket, F_SETFL, sock_flags);
     return -1;
   }
 
-  const int t = recv(socket, buf, buflen, MSG_PEEK);
-
-  if(t < 1)
+  char* ptr = buf;
+  int len = buflen;
+  do
   {
-    fcntl(socket, F_SETFL, sock_flags);
-    return -1;
-  }
-
-  for(int i=0; i< t;i++)
-  {
-    if(buf[i] == '\n'){
-      int r= recv(socket, buf, i+1, 0);
-      buf[i+1]= 0;
-      if(r < 1) {
-        fcntl(socket, F_SETFL, sock_flags);
-        return -1;
-      }
-
-      if(i > 0 && buf[i-1] == '\r'){
-        buf[i-1] = '\n';
-        buf[i]= '\0';
-      }
-
-      fcntl(socket, F_SETFL, sock_flags);
-      return r;
+    int t;
+    while((t = recv(socket, ptr, len, MSG_PEEK)) == -1 && errno == EINTR);
+    
+    if(t < 1)
+    {
+      return -1;
     }
-  }
 
-  int r= recv(socket, buf, t, 0);
-  if(r>=0)
-    buf[r] = 0;
-  fcntl(socket, F_SETFL, sock_flags);
-  return r;
+    
+    for(int i = 0; i<t; i++)
+    {
+      if(ptr[i] == '\n')
+      {
+	/**
+	 * Now consume
+	 */
+	for (len = 1 + i; len; )
+	{
+	  while ((t = recv(socket, ptr, len, 0)) == -1 && errno == EINTR);
+	  if (t < 1)
+	    return -1;
+	  ptr += t;
+	  len -= t;
+	}
+	ptr[0]= 0;
+	return ptr - buf;
+      }
+    }
+    
+    for (int tmp = t; tmp; )
+    {
+      while ((t = recv(socket, ptr, tmp, 0)) == -1 && errno == EINTR);
+      if (t < 1)
+      {
+	return -1;
+      }
+      ptr += t;
+      len -= t;
+      tmp -= t;
+    }
+
+    FD_ZERO(&readset);
+    FD_SET(socket, &readset);
+    timeout.tv_sec  = (timeout_millis / 1000);
+    timeout.tv_usec = (timeout_millis % 1000) * 1000;
+    const int selectRes = select(socket + 1, &readset, 0, 0, &timeout);
+    if(selectRes != 1){
+      return -1;
+    }
+  } while (len > 0);
+  
+  return -1;
 }
 
 extern "C"