Starting MySQL. ERROR! The server quit without updating PID file (/var/lib/mysql/hadoop01.pid).

根据引用和引用提供的信息，这个错误可能是由于PID文件没有写权限导致的。解决方法是给予正确的权限。你可以执行以下命令来更改权限：

1. 执行命令 "chown -R mysql:mysql /var/data"，将所需目录的所有权更改为mysql用户。
2. 执行命令 "chmod -R 755 /usr/local/mysql/data"，将所需目录的权限更改为755。
3. 然后重新启动mysqld服务。

另外，引用也提供了一个启动MySQL的命令示例，你可以尝试使用该命令来启动MySQL服务。命令如下所示：

nohup mysqld_safe --datadir="/mnt/mysql/data" --pid-file="/mnt/mysql/data/xxx.pid" 2>&1 &

请注意将命令中的数据目录和PID文件路径替换为适合你的实际情况的路径。希望这些信息能够帮助你解决问题。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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