LOGGER.error("aa{}",e); 是错误的,异常被吞掉是多么恐怖的一件事啊
LOGGER.error("aa{}",var,e);  这样是可以打印出异常信息的(slf4j老版本的是不支持这种打印的)

logger.debug("Entry number: " + i + " is " +  String.valueOf(entry[i]));
logger.debug("Entry number: {} is {}", i, entry[i]);
前者即使在日志关闭的情况下也会进行字符串拼接,

<appender name="search" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <File>${catalina.base}/logs/search.log</File>
    <encoder>
        <pattern>%d|%X{sys_name}_web|%X{_monitor_cookie}|%m%n</pattern>
    </encoder>
    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
        <fileNamePattern>${catalina.base}/logs/search.log.%d{yyyy-MM-dd-HH}</fileNamePattern>
        <maxHistory>5</maxHistory>
    </rollingPolicy>
</appender>


<!-- 异步输出 -->
<appender name ="asyncSearch" class= "ch.qos.logback.classic.AsyncAppender">
    <!-- 不丢失日志.默认的,如果队列的80%已满,则会丢弃TRACT、DEBUG、INFO级别的日志 -->
    <discardingThreshold >100</discardingThreshold>
    <!-- 更改默认的队列的深度,该值会影响性能.默认值为256 -->
    <queueSize>512</queueSize>
    <!-- 添加附加的appender,最多只能添加一个 -->
    <appender-ref ref ="search"/>
</appender>