c# - failed to update column value via thrift api -

this test case pass @ first time, failed next. don't know why didn't update column value "value1" after execute insert method @ second time.

   [testmethod]     public void testmethod()     {          client.set_keyspace(keyspace);          byte[] key = utf8encoding.getbytes("123456789");          columnparent parent = new columnparent();         parent.column_family = "users";          column column = new column();         column.name = utf8encoding.getbytes("columnname1");         column.timestamp = datetime.now.millisecond;         column.value = utf8encoding.getbytes("value1");          // insert         client.insert(key, parent, column, consistencylevel.one);          columnpath path = new columnpath();         path.column_family = "users";         path.column = utf8encoding.getbytes("columnname1");          // search         columnorsupercolumn returnedcolumn = client.get(key, path, consistencylevel.one);         assert.areequal("value1", utf8encoding.getstring(returnedcolumn.column.value));          // update         column.timestamp = datetime.now.millisecond;         column.value = utf8encoding.getbytes("value2");         client.insert(key, parent, column, consistencylevel.one);          returnedcolumn = client.get(key, path, consistencylevel.one);         assert.areequal("value2", utf8encoding.getstring(returnedcolumn.column.value)); 

if calling twice in row in code need make sure time stamp incrementing. use microsecond resolution , make function remembers last time returned , adds 1 if next time less or equal last time returned.

only using millisecond resolution time stamps same, cassandra reverts comparing bytes, value2 wins.