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will be different between FE and BE.  I will cause exception or core. 

8. Print status not error code

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If error status is returned when call some method failed. Do not only print error code or error message, you could just print status object.  because status will print callstack, we could know 

which line failed.  For example, in compaction, we print the result status, like this code:

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then we could get error stack, like this:

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