Got An error reading communication packets

The Mysql error log suddenly found a large number of Got an error reading communication packets

grep "Got An error reading communication packets" Error_log_3356.err |wc-l

360

Compare baseline parameter files and find log_warnings changes

Mysql> SELECT @ @log_warnings;
+----------------+
| @ @log_warnings |
+----------------+
| 2 |
+----------------+
1 row in Set (0.00 sec)


mysql> set global log_warnings=0;
Query OK, 0 rows Affected (0.00 sec)


Mysql> SELECT @ @log_warnings;
+----------------+
| @ @log_warnings |
+----------------+
| 0 |
+----------------+
1 row in Set (0.00 sec)

The official document explains the log_warnings

Print out warnings such as aborted connection ... to the error log. This option is enabled (1) by default. To disable it, use--log-warnings=0. Specifying the option without a level value increments the current value by 1. Enabling this option by setting it greater than 0 are recommended, for example, if your use replication Ation about what is happening, such as messages about network failures and reconnections). If the value is greater than 1, aborted connections are written to the error log, and access-denied errors for new connect Ion attempts are written

Http://dev.mysql.com/doc/refman/5.6/en/server-options.html#option_mysqld_log-warnings