derkuci opened a new pull request #20541:
URL: https://github.com/apache/airflow/pull/20541


   As initially discussed in #20500, if the user code adds a log handler to 
write to the standard out/err, there will be an infinite loop of logging 
messages.  The `StreamLogWriter._buffer` will be doubled in each iteration, and 
soon use up all the memory.
   
   This change doesn't stop the infinite loop; it merely changes the growth of 
`StreamLogWriter._buffer` from exponential to linear, which will also lead to 
runtime error (stack overflow).  However, that is much easier to debug (see the 
infinite loop) than the out-of-memory error (no call stack).
   
   For normal cases, this doesn't change the logging behavior.


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