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| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB用户手册 (V0.12.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>IoTDB简介</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>快速上手</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>数据模式与概念</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>SQL命令行终端(CLI)</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>权限管理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>IoTDB-SQL 语言</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>应用编程接口</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>用户定义函数(UDF)</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>通信服务协议</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>系统工具</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/V0.12.x/System-Tools/Load-External-Tsfile.html" class="sidebar-link">加载 TsFile</a></li><li><a href="/zh/UserGuide/V0.12.x/System-Tools/Performance-Tracing-Tool.html" class="sidebar-link">查询性能追踪</a></li><li><a href="/zh/UserGuide/V0.12.x/System-Tools/CSV-Tool.html" class="sidebar-link">导入导出 CSV</a></li><li><a href="/zh/UserGuide/V0.12.x/System-Tools/Monitor-and-Log-Tools.html" aria-current="page" class="active sidebar-link">监控工具和系统日志</a></li><li><a href="/zh/UserGuide/V0.12.x/System-Tools/JMX-Tool.html" class="sidebar-link">JMX 工具</a></li><li><a href="/zh/UserGuide/V0.12.x/System-Tools/MLogParser-Tool.html" class="sidebar-link">Mlog解析工具</a></li><li><a href="/zh/UserGuide/V0.12.x/System-Tools/NodeTool.html" class="sidebar-link">节点工具</a></li><li><a href="/zh/UserGuide/V0.12.x/System-Tools/Query-History-Visualization-Tool.html" class="sidebar-link">查询历史可视化工具</a></li><li><a href="/zh/UserGuide/V0.12.x/System-Tools/Watermark-Tool.html" class="sidebar-link">水印工具</a></li><li><a href="/zh/UserGuide/V0.12.x/System-Tools/TsFile-Split-Tool.html" class="sidebar-link">TsFile 拆分工具</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>端云协同</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统集成</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>集群搭建</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>常见问题</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>附录</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h2 id="监控工具"><a href="#监控工具" class="header-anchor">#</a> 监控工具</h2> <h3 id="系统监控"><a href="#系统监控" class="header-anchor">#</a> 系统监控</h3> <p>当前用户可以使用Java的JConsole工具对正在运行的IoTDB进程进行系统状态监控，或使用IoTDB为用户开放的接口查看数据统计量。</p> <h4 id="系统状态监控"><a href="#系统状态监控" class="header-anchor">#</a> 系统状态监控</h4> <p>进入Jconsole监控页面后，首先看到的是IoTDB各类运行情况的概览。在这里，您可以看到堆内存信息、线程信息、类信息以及服务器的CPU使用情况。</p> <h4 id="jmx-mbean监控"><a href="#jmx-mbean监控" class="header-anchor">#</a> JMX MBean监控</h4> <p>通过使用JConsole工具并与JMX连接，您可以查看一些系统统计信息和参数。 |
| 本节描述如何使用JConsole的 "Mbean" 选项卡来监视IoTDB的一些系统配置、写入数据统计等等。 连接到JMX后，您可以通过 "MBeans" 标签找到名为 "org.apache.iotdb.service" 的 "MBean"，如下图所示。</p> <p><img src="https://user-images.githubusercontent.com/19167280/112428223-ce7e3600-8d75-11eb-8e50-04f04571925b.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"> <br></p> <p>Monitor下有几个属性，包括数据文件目录，写入数据统计信息以及某些系统参数的值。 通过双击与属性对应的值，它还可以显示该属性的折线图。有关Monitor属性的具体介绍，请参见以下部分。</p> <ul><li>MBean监视器属性列表</li></ul> <ul><li>SystemDirectory</li></ul> <table><thead><tr><th style="text-align:center;">名称</th> <th style="text-align:left;">SystemDirectory</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">数据系统文件的绝对目录</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">String</td></tr></tbody></table> <ul><li>DataSizeInByte</li></ul> <table><thead><tr><th style="text-align:center;">名称</th> <th style="text-align:left;">DataSizeInByte</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">数据文件的总大小</td></tr> <tr><td style="text-align:center;">单元</td> <td style="text-align:left;">Byte</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Long</td></tr></tbody></table> <ul><li>EnableStatMonitor</li></ul> <table><thead><tr><th>名称</th> <th>EnableStatMonitor</th></tr></thead> <tbody><tr><td>描述</td> <td>系统监控模块是否开启</td></tr> <tr><td>类型</td> <td>Boolean</td></tr></tbody></table> <ul><li>WriteAheadLogStatus</li></ul> <table><thead><tr><th style="text-align:center;">名称</th> <th style="text-align:left;">WriteAheadLogStatus</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">预写日志（WAL）的状态。 True表示启用WAL。</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Boolean</td></tr></tbody></table> <ul><li>GlobalTotalPointsNum</li></ul> <table><thead><tr><th style="text-align:center;">名称</th> <th style="text-align:left;">GlobalTotalPointsNum</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">总点数</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Long</td></tr></tbody></table> <ul><li>GlobalReqSuccessNum</li></ul> <table><thead><tr><th style="text-align:center;">名称</th> <th style="text-align:left;">GlobalReqSuccessNum</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">成功的请求数</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Long</td></tr></tbody></table> <ul><li>GlobalReqFailNum</li></ul> <table><thead><tr><th style="text-align:center;">名称</th> <th style="text-align:left;">GlobalReqFailNum</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">失败的请求数</td></tr> <tr><td style="text-align:center;">类型</td> <td style="text-align:left;">Long</td></tr></tbody></table> <h3 id="数据统计监控"><a href="#数据统计监控" class="header-anchor">#</a> 数据统计监控</h3> <p>本模块对数据写入操作提供一些统计信息的监控，包括：</p> <ul><li>IoTDB 中数据文件的大小 (以字节为单位) ，数据写入的总点数</li> <li>写入操作成功和失败的次数</li></ul> <h4 id="开启-关闭监控"><a href="#开启-关闭监控" class="header-anchor">#</a> 开启/关闭监控</h4> <p>用户可以选择开启或关闭数据统计监控功能（您可以设定配置文件中的<code>enable_stat_monitor</code>项，详细信息参见<a href="/zh/UserGuide/V0.12.x/Server/Config Manual.html">第3.4节</a>）。</p> <h3 id="统计数据存储"><a href="#统计数据存储" class="header-anchor">#</a> 统计数据存储</h3> <p>默认情况下，统计数据只储存在内存中，可以使用 Jconsole 进行访问。</p> <p>统计数据还支持以时间序列的格式写入磁盘，可以通过设置配置文件中的<code>enable_monitor_series_write</code>开启。开启后，可以使用 <code>select</code> 命令来对这些统计数据进行查询。</p> <blockquote><p>请注意：</p> <p>如果 <code>enable_monitor_series_write=true</code>, 当 IoTDB 重启时，之前的统计数据会被重新载入内存。 |
| 如果 <code>enable_monitor_series_write=false</code>, IoTDB 关闭时内存中所有的统计信息会被清空。</p></blockquote> <h4 id="写入数据统计"><a href="#写入数据统计" class="header-anchor">#</a> 写入数据统计</h4> <p>系统目前对写入数据的统计可分为两大模块： 全局（Global） 写入数据统计和存储组（Storage Group） 写入数据统计。全局统计量记录了所有写入数据的点数、请求数统计，存储组统计量对每一个存储组的写入数据进行了统计。</p> <p>系统设定监控模块的采集粒度为<strong>每个数据文件刷入磁盘时更新一次统计信息</strong>，因此数据精度可能和实际有所出入。如需获取准确信息，<strong>请先调用 flush 方法后再查询</strong>。</p> <p>写入数据统计项列表（括号内为统计量支持的范围）：</p> <ul><li>TOTAL_POINTS (全局，存储组)</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">TOTAL_POINTS</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">写入总点数</td></tr> <tr><td style="text-align:center;">时间序列名称</td> <td style="text-align:left;">root.stats.{"global" | "storageGroupName"}.TOTAL_POINTS</td></tr></tbody></table> <ul><li>TOTAL_REQ_SUCCESS (全局)</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">TOTAL_REQ_SUCCESS</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">写入请求成功次数</td></tr> <tr><td style="text-align:center;">时间序列名称</td> <td style="text-align:left;">root.stats."global".TOTAL_REQ_SUCCESS</td></tr></tbody></table> <ul><li>TOTAL_REQ_FAIL (全局)</li></ul> <table><thead><tr><th style="text-align:center;">名字</th> <th style="text-align:left;">TOTAL_REQ_FAIL</th></tr></thead> <tbody><tr><td style="text-align:center;">描述</td> <td style="text-align:left;">写入请求失败次数</td></tr> <tr><td style="text-align:center;">时间序列名称</td> <td style="text-align:left;">root.stats."global".TOTAL_REQ_FAIL</td></tr></tbody></table> <p>以上属性同样支持在 Jconsole 中进行可视化显示。对于每个存储组的统计信息，为了避免存储组过多造成显示混乱，用户可以在 Monitor Mbean 下的操作方法中输入存储组名进行相应的统计信息查询。</p> <p><img src="https://user-images.githubusercontent.com/34242296/92922942-34a20c00-f469-11ea-8dc2-8229d454583c.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"> <br></p> <h4 id="示例"><a href="#示例" class="header-anchor">#</a> 示例</h4> <p>下面为您展示两个具体的例子。用户可以通过<code>SELECT</code>语句查询自己所需要的写入数据统计项。（查询方法与普通的时间序列查询方式一致）</p> <p>我们以查询全局统计量总点数（<code>TOTAL_POINTS</code>）为例，用IoTDB SELECT语句查询它的值。SQL语句如下：</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> TOTAL_POINTS <span class="token keyword">from</span> root<span class="token punctuation">.</span>stats<span class="token punctuation">.</span><span class="token string">"global"</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>我们以查询存储组root.ln的统计量总点数（<code>TOTAL_POINTS</code>）为例，用IoTDB SELECT语句查询它的值。SQL语句如下：</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> TOTAL_POINTS <span class="token keyword">from</span> root<span class="token punctuation">.</span>stats<span class="token punctuation">.</span><span class="token string">"root.ln"</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>若您需要查询当前系统的最新信息，您可以使用最新数据查询，SQL语句如下：</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code>flush |
| <span class="token keyword">select</span> <span class="token keyword">last</span> TOTAL_POINTS <span class="token keyword">from</span> root<span class="token punctuation">.</span>stats<span class="token punctuation">.</span><span class="token string">"global"</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h3 id="性能监控"><a href="#性能监控" class="header-anchor">#</a> 性能监控</h3> <h4 id="介绍"><a href="#介绍" class="header-anchor">#</a> 介绍</h4> <p>性能监控模块用来监控IOTDB每一个操作的耗时，以便用户更好的了解数据库的整体性能。此模块会统计每一种操作的平均耗时，以及耗时在一定时间区间内（1ms，4ms，16ms，64ms，256ms，1024ms，以上）的操作的比例。输出文件在log_measure.log中。输出样例如下：</p> <img src="https://user-images.githubusercontent.com/13203019/60937461-14296f80-a303-11e9-9602-a7bed624bfb3.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"> <h4 id="配置参数"><a href="#配置参数" class="header-anchor">#</a> 配置参数</h4> <p>配置文件位置：conf/iotdb-engine.properties</p> <center>**表 -配置参数以及描述项** |
| <table><thead><tr><th style="text-align:left;">参数</th> <th style="text-align:left;">默认值</th> <th style="text-align:left;">描述</th></tr></thead> <tbody><tr><td style="text-align:left;">enable_performance_stat</td> <td style="text-align:left;">false</td> <td style="text-align:left;">是否开启性能监控模块</td></tr> <tr><td style="text-align:left;">performance_stat_display_interval</td> <td style="text-align:left;">60000</td> <td style="text-align:left;">打印统计结果的时间延迟，以毫秒为单位</td></tr> <tr><td style="text-align:left;">performance_stat_memory_in_kb</td> <td style="text-align:left;">20</td> <td style="text-align:left;">性能监控模块使用的内存阈值，单位为KB</td></tr></tbody></table></center> <h4 id="利用jmx-mbean动态调节参数"><a href="#利用jmx-mbean动态调节参数" class="header-anchor">#</a> 利用JMX MBean动态调节参数</h4> <p>通过端口31999连接jconsole，并在上方菜单项中选择<code>MBean</code>. 展开侧边框并选择 <code>org.apache.iotdb.db.cost.statistic</code>. 将会得到如下图所示结果：</p> <img src="https://user-images.githubusercontent.com/19167280/112426751-721a1700-8d73-11eb-871c-db2e9c13cf99.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"> <p><strong>属性</strong></p> <ol><li>EnableStat：是否开启性能监控模块，如果被设置为true，则性能监控模块会记录每个操作的耗时并打印结果。这个参数不能直接通过jconsole直接更改，但可通过下方的函数来进行动态设置。</li> <li>DisplayIntervalInMs：相邻两次打印结果的时间间隔。这个参数可以直接设置，但它要等性能监控模块重启才会生效。重启性能监控模块可以通过先调用 stopStatistic()然后调用startContinuousStatistics()或者直接调用 startOneTimeStatistics()实现。</li> <li>OperationSwitch：这个属性用来展示针对每一种操作是否开启了监控统计，map的键为操作的名字，值为是否针对这种操作开启性能监控。这个参数不能直接通过jconsole直接更改，但可通过下方的 'changeOperationSwitch()'函数来进行动态设置。</li></ol> <p><strong>操作</strong></p> <ol><li>startStatistics：开启性能监控。</li> <li>startContinuousPrintStatistics：开启性能监控并以‘DisplayIntervalInMs’的时间间隔打印统计结果。</li> <li>startPrintStatisticsOnce：开启性能监控并以‘DisplayIntervalInMs’的时间延迟打印一次统计结果。</li> <li>stopPrintStatistic：关闭打印性能监控的统计结果。</li> <li>stopStatistic：关闭性能监控。</li> <li>clearStatisticalState(): 清除以统计的结果，从新开始统计。</li> <li>changeOperationSwitch(String operationName, Boolean operationState):设置是否针对每一种不同的操作开启监控。参数‘operationName是操作的名称，在OperationSwitch属性中展示了所有操作的名称。参数 ‘operationState’是操作的状态，打开或者关闭。如果状态设置成功则此函数会返回true，否则返回false。</li></ol> <h3 id="自定义操作类型监控其他区域"><a href="#自定义操作类型监控其他区域" class="header-anchor">#</a> 自定义操作类型监控其他区域</h3> <p><strong>增加操作项</strong></p> <p>在org.apache.iotdb.db.cost.statistic.Operation类中增加一个枚举项来表示新增的操作.</p> <p><strong>在监控区域增加监控代码</strong></p> <p>在监控开始区域增加计时代码:</p> <div class="language- extra-class"><pre><code>long t0 = System. currentTimeMillis(); |
| </code></pre></div><p>在监控结束区域增加记录代码:</p> <div class="language- extra-class"><pre><code>Measurement.INSTANCE.addOperationLatency(Operation, t0); |
| </code></pre></div><h3 id="cache命中率统计"><a href="#cache命中率统计" class="header-anchor">#</a> cache命中率统计</h3> <h4 id="概述"><a href="#概述" class="header-anchor">#</a> 概述</h4> <p>为了提高查询性能，IOTDB对ChunkMetaData和TsFileMetaData进行了缓存。用户可以通过debug级别的日志以及MXBean两种方式来查看缓存的命中率，并根据缓存命中率以及系统内存来调节缓存所使用的内存大小。使用MXBean查看缓存命中率的方法为：</p> <ol><li>通过端口31999连接jconsole，并在上方菜单项中选择‘MBean’.</li> <li>展开侧边框并选择 'org.apache.iotdb.db.service'. 将会得到如下图所示结果：</li></ol> <img src="https://user-images.githubusercontent.com/19167280/112426760-73e3da80-8d73-11eb-9a8f-9232d1f2033b.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"> <h2 id="系统日志"><a href="#系统日志" class="header-anchor">#</a> 系统日志</h2> <p>IoTDB支持用户通过修改日志配置文件的方式对IoTDB系统日志（如日志输出级别等）进行配置，系统日志配置文件默认位置在$IOTDB_HOME/conf文件夹下，默认的日志配置文件名为logback.xml。用户可以通过增加或更改其中的xml树型节点参数对系统运行日志的相关配置进行修改。详细配置说明参看本文日志文件配置说明。</p> <p>同时，为了方便在系统运行过程中运维人员对系统的调试，我们为系统运维人员提供了动态修改日志配置的JMX接口，能够在系统不重启的前提下实时对系统的Log模块进行配置。详细使用方法参看动态系统日志配置说明)。</p> <h3 id="动态系统日志配置说明"><a href="#动态系统日志配置说明" class="header-anchor">#</a> 动态系统日志配置说明</h3> <h4 id="连接jmx"><a href="#连接jmx" class="header-anchor">#</a> 连接JMX</h4> <p>本节以Jconsole为例介绍连接JMX并进入动态系统日志配置模块的方法。启动Jconsole控制页面，在新建连接处建立与IoTDB Server的JMX连接（可以选择本地进程或给定IoTDB的IP及PORT进行远程连接，IoTDB的JMX服务默认运行端口为31999），如下图使用远程进程连接Localhost下运行在31999端口的IoTDB JMX服务。</p> <img src="https://user-images.githubusercontent.com/13203019/51577195-f94d7500-1ef3-11e9-999a-b4f67055d80e.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"> <p>连接到JMX后，您可以通过MBean选项卡找到名为<code>ch.qos.logback.classic</code>的<code>MBean</code>，如下图所示。</p> <img src="https://user-images.githubusercontent.com/13203019/51577204-fe122900-1ef3-11e9-9e89-2eb1d46e24b8.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"> <p>在<code>ch.qos.logback.classic</code>的MBean操作（Operations）选项中，可以看到当前动态系统日志配置支持的6种接口，您可以通过使用相应的方法，来执行相应的操作，操作页面如图。</p> <img src="https://user-images.githubusercontent.com/13203019/51577216-09fdeb00-1ef4-11e9-9005-542ad7d9e9e0.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"> <h4 id="动态系统日志接口说明"><a href="#动态系统日志接口说明" class="header-anchor">#</a> 动态系统日志接口说明</h4> <ul><li>reloadDefaultConfiguration接口</li></ul> <p>该方法为重新加载默认的logback配置文件，用户可以先对默认的配置文件进行修改，然后调用该方法将修改后的配置文件重新加载到系统中，使其生效。</p> <ul><li>reloadByFileName接口</li></ul> <p>该方法为加载一个指定路径的logback配置文件，并使其生效。该方法接受一个名为p1的String类型的参数，该参数为需要指定加载的配置文件路径。</p> <ul><li>getLoggerEffectiveLevel接口</li></ul> <p>该方法为获取指定Logger当前生效的日志级别。该方法接受一个名为p1的String类型的参数，该参数为指定Logger的名称。该方法返回指定Logger当前生效的日志级别。</p> <ul><li>getLoggerLevel接口</li></ul> <p>该方法为获取指定Logger的日志级别。该方法接受一个名为p1的String类型的参数，该参数为指定Logger的名称。该方法返回指定Logger的日志级别。</p> <p>需要注意的是，该方法与<code>getLoggerEffectiveLevel</code>方法的区别在于，该方法返回的是指定Logger在配置文件中被设定的日志级别，如果用户没有对该Logger进行日志级别的设定，则返回空。按照Logback的日志级别继承机制，如果一个Logger没有被显示地设定日志级别，其将会从其最近的祖先继承日志级别的设定。这时，调用<code>getLoggerEffectiveLevel</code>方法将返回该Logger生效的日志级别；而调用本节所述方法，将返回空。</p> <ul><li>setLoggerLevel接口</li></ul> <p>该方法为设置指定Logger的日志级别。该方法接受一个名为p1的String类型的参数和一个名为p2的String类型的参数，分别指定Logger的名称和目标的日志等级。</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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