mysql_error:Error starting thread:Resource temporarily unava_MySQL

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mysql_error:Error starting thread:Resource temporarily unavailable

Sql代码      

121031 18:53:17  InnoDB: Unable to open the first data file  

InnoDB: Error in opening ./ibdata1  

121031 18:53:17  InnoDB: Operating system error number 11 in a file operation.  

InnoDB: Error number 11 means 'Resource temporarily unavailable'.  

InnoDB: Some operating system error numbers are described at  

InnoDB: http://dev.mysql.com/doc/refman/5.5/en/operating-system-error-codes.html  

121031 18:53:17 InnoDB: Could not open or create data files.  

121031 18:53:17 InnoDB: If you tried to add new data files, and it failed here,  

121031 18:53:17 InnoDB: you should now edit innodb_data_file_path in my.cnf back  

121031 18:53:17 InnoDB: to what it was, and remove the new ibdata files InnoDB created   

121031 18:53:17 InnoDB: in this failed attempt. InnoDB only wrote those files full of   

121031 18:53:17 InnoDB: zeros, but did not yet use them in any way. But be careful: do not  

121031 18:53:17 InnoDB: remove old data files which contain your precious data!  

121031 18:53:17 [ERROR] Plugin 'InnoDB' init function returned error.  

121031 18:53:17 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.   

121031 18:53:17 [ERROR] Unknown/unsupported storage engine: INNODB  

121031 18:53:17 [ERROR] Aborting  

121031 18:53:17 [Note] /usr/local/mysql/bin/mysqld: Shutdown complete  

121031 18:53:17 mysqld_safe mysqld from pid file /data/mysql/mysql_3301/mysql_3301.pid ended  

121031 18:54:29 mysqld_safe Starting mysqld daemon with databases from /data/mysql/mysql_3301  

121031 18:54:29 [Warning] The syntax '--log-slow-queries' is deprecated and will be removed in a future release. Please use '--slow-  

query-log'/'--slow-query-log-file' instead.  

121031 18:54:29 InnoDB: The InnoDB memory heap is disabled  

121031 18:54:29 InnoDB: Mutexes and rw_locks use GCC atomic builtins  

121031 18:54:29 InnoDB: Compressed tables use zlib 1.2.3  

121031 18:54:30 InnoDB: Initializing buffer pool, size = 2.9G  

121031 18:54:30 InnoDB: Completed initialization of buffer pool  

InnoDB: Unable to lock ./ibdata1, error: 11  

InnoDB: Check that you do not already have another mysqld process  

InnoDB: using the same InnoDB data or log files.  

121031 18:54:30  InnoDB: Retrying to lock the first data file  

InnoDB: Unable to lock ./ibdata1, error: 11  

InnoDB: Check that you do not already have another mysqld process  

InnoDB: using the same InnoDB data or log files.  

121031 18:54:30  InnoDB: Retrying to lock the first data file  

InnoDB: Unable to lock ./ibdata1, error: 11  

InnoDB: Check that you do not already have another mysqld process  

InnoDB: using the same InnoDB data or log files.  

InnoDB: Unable to lock ./ibdata1, error: 11  

InnoDB: Check that you do not already have another mysqld process  

InnoDB: using the same InnoDB data or log files.  

InnoDB: Unable to lock ./ibdata1, error: 11  

Sql代码  

InnoDB: Error number 11 means 'Resource temporarily unavailable'.  

Error starting thread: Resource temporarily unavailable 

经过深入查询，排除了内存，句柄数等问题. 并且切换至root用户打开大量线程时没有问题。试着调整ulimit各项参数,最后发现是"max user processes "参数有问题，通过root用户调整大小至 12000,线程数也随着增大.

Java代码 

root@blog:/home/badqiu# ulimit -a 

core file size          (blocks, -c) 0 

data seg size           (kbytes, -d) unlimited 

scheduling priority             (-e) 0 

file size               (blocks, -f) unlimited 

pending signals                 (-i) 143360 

max locked memory       (kbytes, -l) 32 

max memory size         (kbytes, -m) unlimited 

open files                      (-n) 2048 

pipe size            (512 bytes, -p) 8 

POSIX message queues     (bytes, -q) 819200 

real-time priority              (-r) 0 

stack size              (kbytes, -s) 8192 

cpu time               (seconds, -t) unlimited 

max user processes              (-u) 2046 

virtual memory          (kbytes, -v) unlimited 

file locks                      (-x) unlimited 

在linux系统内生效。

vi /etc/security/limits.conf

Java代码 

* soft nproc 12000 

* hard nproc 12000 

 nproc就是"max user processes"，完整描述是: nproc - max number of processes

参数含义:

单个用户可以启动的线程数，因为进程也会启动一个线程，所以也间接对进程数有限制。

注意：

该参数只对普通用户有用，root用户不在此限制。 所以用root用户可以启动几万个线程，无法重现这个问题.