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We are moving to MODERN C++ now, and Exception Safe Code will reduce the usage of LOG(FATAL) and BE will be more stable. 

1.1 Use Smart Pointer

For example, in this code, there is a raw pointer block_ptr(at line 442), and this block_ptr will pass to send_block method at line 450. It is ok in normal cases. But there is a RETURN_IF_ERROR at line 446, so it is memory leak.

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