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aria-label="系统配置项（iotdb-datanode.properties）"><!---->系统配置项（iotdb-datanode.properties）<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/zh/UserGuide/V1.2.x/Reference/DataNode-Config-Manual.html#开启-gc-日志" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="开启 GC 日志"><!---->开启 GC 日志<!----></a><ul class="sidebar-sub-headers"></ul></li></ul></li></ul><!--]--></li><li><!--[--><a href="/zh/UserGuide/V1.2.x/Reference/SQL-Reference.html" class="nav-link sidebar-link sidebar-page" aria-label="SQL参考文档"><!---->SQL参考文档<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/zh/UserGuide/V1.2.x/Reference/Status-Codes.html" class="nav-link sidebar-link sidebar-page" aria-label="状态码"><!---->状态码<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a href="/zh/UserGuide/V1.2.x/Reference/Keywords.html" class="nav-link sidebar-link sidebar-page" 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| --><h2 id="datanode-配置参数" tabindex="-1"><a class="header-anchor" href="#datanode-配置参数" aria-hidden="true">#</a> DataNode 配置参数</h2><p>IoTDB DataNode 与 Standalone 模式共用一套配置文件，均位于 IoTDB 安装目录：<code>conf</code>文件夹下。</p><ul><li><p><code>datanode-env.sh/bat</code>：环境配置项的配置文件，可以配置 DataNode 的内存大小。</p></li><li><p><code>iotdb-datanode.properties</code>：IoTDB DataNode 和单机版的配置文件。</p></li></ul><h3 id="热修改配置项" tabindex="-1"><a class="header-anchor" href="#热修改配置项" aria-hidden="true">#</a> 热修改配置项</h3><p>为方便用户使用，IoTDB 为用户提供了热修改功能，即在系统运行过程中修改 <code>iotdb-datanode.properties</code> 和 <code>iotdb-common.properties</code> 中部分配置参数并即时应用到系统中。下面介绍的参数中，改后 生效方式为<code>热加载</code> 的均为支持热修改的配置参数。</p><p>通过 Session 或 Cli 发送 <code>load configuration</code> 命令（SQL）至 IoTDB 可触发配置热加载。</p><h3 id="环境配置项-datanode-env-sh-bat" tabindex="-1"><a class="header-anchor" href="#环境配置项-datanode-env-sh-bat" aria-hidden="true">#</a> 环境配置项（<a href="http://datanode-env.sh/bat%EF%BC%89" target="_blank" rel="noopener noreferrer">datanode-env.sh/bat）<span><svg class="external-link-icon" 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"><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="external-link-icon-sr-only">open in new window</span></span></a></h3><p>环境配置项主要用于对 DataNode 运行的 Java 环境相关参数进行配置，如 JVM 相关配置。DataNode/Standalone 启动时，此部分配置会被传给 JVM，详细配置项说明如下：</p><ul><li>MAX_HEAP_SIZE</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">MAX_HEAP_SIZE</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">IoTDB 能使用的最大堆内存大小</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">String</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">取决于操作系统和机器配置。在 Linux 或 MacOS 系统下默认为机器内存的四分之一。在 Windows 系统下，32 位系统的默认值是 512M，64 位系统默认值是 2G。</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>HEAP_NEWSIZE</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">HEAP_NEWSIZE</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">IoTDB 启动时分配的最小堆内存大小</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">String</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">取决于操作系统和机器配置。在 Linux 或 MacOS 系统下默认值为机器 CPU 核数乘以 100M 的值与 MAX_HEAP_SIZE 四分之一这二者的最小值。在 Windows 系统下，32 位系统的默认值是 512M，64 位系统默认值是 2G。</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>MAX_DIRECT_MEMORY_SIZE</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">MAX_DIRECT_MEMORY_SIZE</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">IoTDB 能使用的最大堆外内存大小</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">String</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">默认与最大堆内存相等</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>JMX_LOCAL</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">JMX_LOCAL</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">JMX 监控模式，配置为 true 表示仅允许本地监控，设置为 false 的时候表示允许远程监控。如想在本地通过网络连接JMX Service，比如nodeTool.sh会尝试连接127.0.0.1:31999，请将JMX_LOCAL设置为false。</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">枚举 String : “true”, “false”</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">true</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>JMX_PORT</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">JMX_PORT</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">JMX 监听端口。请确认该端口是不是系统保留端口并且未被占用。</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">Short Int: [0,65535]</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">31999</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><h3 id="系统配置项-iotdb-datanode-properties" tabindex="-1"><a class="header-anchor" href="#系统配置项-iotdb-datanode-properties" aria-hidden="true">#</a> 系统配置项（iotdb-datanode.properties）</h3><p>系统配置项是 IoTDB DataNode/Standalone 运行的核心配置，它主要用于设置 DataNode/Standalone 数据库引擎的参数。</p><h4 id="data-node-rpc-服务配置" tabindex="-1"><a class="header-anchor" href="#data-node-rpc-服务配置" aria-hidden="true">#</a> Data Node RPC 服务配置</h4><ul><li>dn_rpc_address</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_rpc_address</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">客户端 RPC 服务监听地址</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">String</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">127.0.0.1</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_rpc_port</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_rpc_port</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">Client RPC 服务监听端口</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">Short Int : [0,65535]</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">6667</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_internal_address</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_internal_address</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">DataNode 内网通信地址</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">string</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">127.0.0.1</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_internal_port</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_internal_port</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">DataNode 内网通信端口</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">int</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">10730</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_mpp_data_exchange_port</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_mpp_data_exchange_port</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">MPP 数据交换端口</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">int</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">10740</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_schema_region_consensus_port</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_schema_region_consensus_port</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">DataNode 元数据副本的共识协议通信端口</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">int</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">10750</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_data_region_consensus_port</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_data_region_consensus_port</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">DataNode 数据副本的共识协议通信端口</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">int</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">10760</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_join_cluster_retry_interval_ms</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_join_cluster_retry_interval_ms</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">DataNode 再次重试加入集群等待时间</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">long</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">5000</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><h4 id="目标-config-nodes-配置" tabindex="-1"><a class="header-anchor" href="#目标-config-nodes-配置" aria-hidden="true">#</a> 目标 Config Nodes 配置</h4><ul><li>dn_target_config_node_list</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_target_config_node_list</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">ConfigNode 地址，DataNode 启动时通过此地址加入集群</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">String</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">127.0.0.1:10710</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><h4 id="连接配置" tabindex="-1"><a class="header-anchor" href="#连接配置" aria-hidden="true">#</a> 连接配置</h4><ul><li>dn_session_timeout_threshold</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_session_timeout_threshold</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">最大的会话空闲时间</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">int</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">0</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_rpc_thrift_compression_enable</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_rpc_thrift_compression_enable</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">是否启用 thrift 的压缩机制</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">Boolean</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">false</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_rpc_advanced_compression_enable</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_rpc_advanced_compression_enable</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">是否启用 thrift 的自定制压缩机制</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">Boolean</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">false</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_rpc_selector_thread_count</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">rpc_selector_thread_count</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">rpc 选择器线程数量</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">int</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">1</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_rpc_min_concurrent_client_num</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">rpc_min_concurrent_client_num</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">最小连接数</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">Short Int : [0,65535]</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">1</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_rpc_max_concurrent_client_num</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_rpc_max_concurrent_client_num</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">最大连接数</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">Short Int : [0,65535]</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">65535</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_thrift_max_frame_size</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_thrift_max_frame_size</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">RPC 请求/响应的最大字节数</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">long</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">536870912 （默认值512MB，应大于等于 512 * 1024 * 1024)</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_thrift_init_buffer_size</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_thrift_init_buffer_size</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">字节数</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">long</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">1024</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_core_client_count_for_each_node_in_client_manager</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_core_client_count_for_each_node_in_client_manager</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">单 ClientManager 中路由到每个节点的核心 Client 个数</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">int</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">200</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_max_client_count_for_each_node_in_client_manager</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_max_client_count_for_each_node_in_client_manager</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">单 ClientManager 中路由到每个节点的最大 Client 个数</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">int</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">300</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><h4 id="目录配置" tabindex="-1"><a class="header-anchor" href="#目录配置" aria-hidden="true">#</a> 目录配置</h4><ul><li>dn_system_dir</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_system_dir</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">IoTDB 元数据存储路径，默认存放在和 sbin 目录同级的 data 目录下。相对路径的起始目录与操作系统相关，建议使用绝对路径。</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">String</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">data/datanode/system（Windows：data\datanode\system）</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_data_dirs</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_data_dirs</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">IoTDB 数据存储路径，默认存放在和 sbin 目录同级的 data 目录下。相对路径的起始目录与操作系统相关，建议使用绝对路径。</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">String</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">data/datanode/data（Windows：data\datanode\data）</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_multi_dir_strategy</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_multi_dir_strategy</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">IoTDB 在 data_dirs 中为 TsFile 选择目录时采用的策略。可使用简单类名或类名全称。系统提供以下三种策略：<br>1. SequenceStrategy：IoTDB 按顺序选择目录，依次遍历 data_dirs 中的所有目录，并不断轮循；<br>2. MaxDiskUsableSpaceFirstStrategy：IoTDB 优先选择 data_dirs 中对应磁盘空余空间最大的目录；<br>3. MinFolderOccupiedSpaceFirstStrategy：IoTDB 优先选择 data_dirs 中已使用空间最小的目录；<br>4. UserDefineStrategyPackage（用户自定义策略）<br>您可以通过以下方法完成用户自定义策略：<br>1. 继承 org.apache.iotdb.db.conf.directories.strategy 类并实现自身的 Strategy 方法；<br>2. 将实现的类的完整类名（包名加类名，UserDefineStrategyPackage）填写到该配置项；<br>3. 将该类 jar 包添加到工程中。</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">String</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">SequenceStrategy</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">热加载</td></tr></tbody></table><ul><li>dn_consensus_dir</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_consensus_dir</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">IoTDB 共识层日志存储路径，默认存放在和 sbin 目录同级的 data 目录下。相对路径的起始目录与操作系统相关，建议使用绝对路径。</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">String</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">data/datanode/consensus（Windows：data\datanode\consensus）</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_wal_dirs</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_wal_dirs</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">IoTDB 写前日志存储路径，默认存放在和 sbin 目录同级的 data 目录下。相对路径的起始目录与操作系统相关，建议使用绝对路径。</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">String</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">data/datanode/wal（Windows：data\datanode\wal）</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_tracing_dir</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_tracing_dir</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">IoTDB 追踪根目录路径，默认存放在和 sbin 目录同级的 data 目录下。相对路径的起始目录与操作系统相关，建议使用绝对路径。</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">String</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">datanode/tracing</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><ul><li>dn_sync_dir</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">dn_sync_dir</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">IoTDB sync 存储路径，默认存放在和 sbin 目录同级的 data 目录下。相对路径的起始目录与操作系统相关，建议使用绝对路径。</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">String</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">data/datanode/sync</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">重启服务生效</td></tr></tbody></table><h4 id="metric-配置" tabindex="-1"><a class="header-anchor" href="#metric-配置" aria-hidden="true">#</a> Metric 配置</h4><h3 id="开启-gc-日志" tabindex="-1"><a class="header-anchor" href="#开启-gc-日志" aria-hidden="true">#</a> 开启 GC 日志</h3><p>GC 日志默认是关闭的。为了性能调优，用户可能会需要收集 GC 信息。 若要打开 GC 日志，则需要在启动 IoTDB Server 的时候加上"printgc"参数：</p><div class="language-bash line-numbers-mode" data-ext="sh"><pre class="language-bash"><code><span class="token function">nohup</span> sbin/start-datanode.sh printgc <span class="token operator">></span>/dev/null <span class="token operator"><span class="token file-descriptor important">2</span>></span><span class="token file-descriptor important">&1</span> <span class="token operator">&</span> |
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