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问题

生产环境进行druid服务重启时，发现overload middle- manager，broker，coordinator，route服务都可以正常启动，但是historical服务启动失败 失败错误如下

• 错误信息

Caused by: java.lang.RuntimeException: java.lang.OutOfMemoryError: unable to create new native thread Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00007ee213a7f000, 262144, 0) failed; error='Cannot allocate memory' (errno=12) There is insufficient memory for the Java Runtime Environment to continue. Native memory allocation (mmap) failed to map 262144 bytes for committing reserved memory. #An error report file with more information is saved as:

问题分析

• 查看问题，发现内存分配失败，系统不足以分配这个内存

解决方法

• 根据Google 结果，发现是Linux服务限制了内存的分配，通过修改配置解决，将参数调大【65536 ->262144],启动成功
  vim /etc/security/limits.conf
  vm.max_map_count = 262144

参考文档

• https://support.imply.io/hc/en-us/articles/360060443474-Historical-will-not-start-due-to-OOM-and-failed-to-map-errors-though-there-is-enough-heap-available-and-ulimit-is-set-very-high