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Comment: minor edits & a link to hive.async.log.enabled in Config Properties doc

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Error logs are very useful to debug problems. Please send them with any bugs (of which there are many!) to hive-dev@hadoop.apache.org.

From Hive 2.1.0 onwards , (with HIVE-13027) hive , Hive uses Log4j2's asynchronous logger by default. Setting hive.async.log.enabled to false will disable asynchronous logging and fallback to synchronous logging. Asynchronous logging can give significant performance improvement as logging will be handled in a separate thread that uses the LMAX disruptor queue for buffering log messages. Refer to https://logging.apache.org/log4j/2.x/manual/async.html for  for benefits and drawbacks.

HiveServer2 Logs

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