Hadoop Log Dir Prefix

Hadoop Log Dir Prefix 是 Hadoop 集群中用于指定日志文件目录前缀的配置项。在 Hadoop 集群中，每个节点上都会生成大量的日志文件，这些日志文件记录了集群的运行状态、任务执行情况、错误信息等重要信息。为了方便管理这些日志文件，Hadoop 提供了 Hadoop Log Dir Prefix 配置项，用于指定日志文件目录前缀，以便对日志文件进行归类和管理。

Hadoop Log Dir Prefix 默认值为 ${hadoop.log.dir}/，其中 ${hadoop.log.dir} 是一个 Hadoop 系统变量，表示 Hadoop 的日志文件目录。在实际使用中，可以通过修改 Hadoop Log Dir Prefix 配置项来指定不同的日志文件目录前缀。例如，可以将 Hadoop Log Dir Prefix 设置为 /var/log/hadoop/，这样所有的日志文件就会被保存在 /var/log/hadoop/ 目录下。

相关问题

Hadoop PID Dir Prefix

Hadoop PID (Process ID) Dir Prefix is a configuration property that specifies the prefix for the directory name where Hadoop daemon process IDs (PIDs) are stored. By default, the value of this property is "hadoop-", which means that the daemon PID directories will have names like "hadoop-namenode.pid" or "hadoop-datanode.pid".

PID directories are used by Hadoop to store the process IDs of its daemons, which are used for monitoring and managing the daemons. For example, when a daemon is started by Hadoop, its PID is stored in a PID file in the PID directory. This PID file can be used to stop or restart the daemon later.

It is recommended to keep the default value of this property, unless there is a specific reason to change it.

hadoop.log.dir=.

这是一个Hadoop配置文件中的属性，表示Hadoop日志文件的输出目录。该属性指定了Hadoop集群中所有节点的日志文件所在的目录。这些日志文件包括Hadoop守护进程的日志，例如NameNode、DataNode、ResourceManager和NodeManager的日志。默认情况下，该属性的值为${hadoop.tmp.dir}/logs。