There is insufficient memory for the Java Runtime Environment to continue. 解决

在Centos  6.4 X64， JDK 1.7 U21下用hadoop 1.2.1 运行 mahout 0.9，处理一个5GB的数据，系统提示There is insufficient memory for the Java Runtime Environment to continue.

14/07/15 08:46:05 INFO mapred.JobClient: Task Id : attempt_201407141818_0002_m_000018_0, Status : FAILED
java.lang.Throwable: Child Error
        at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271)
Caused by: java.io.IOException: Task process exit with nonzero status of 1.
        at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:258)


attempt_201407141818_0002_m_000018_0: #
attempt_201407141818_0002_m_000018_0: # There is insufficient memory for the Java Runtime Environment to continue.
attempt_201407141818_0002_m_000018_0: # Cannot create GC thread. Out of system resources.
attempt_201407141818_0002_m_000018_0: # An error report file with more information is saved as:
attempt_201407141818_0002_m_000018_0: # /home/hadoop/hd_space/mapred/local/taskTracker/hadoop/jobcache/job_201407141818_0002/attempt_201407141818_0002_m_000018_0/work/hs_err_pid25377.log
14/07/15 08:46:07 INFO mapred.JobClient:  map 15% reduce 0%
14/07/15 08:46:09 INFO mapred.JobClient:  map 16% reduce 0%
14/07/15 08:46:09 INFO mapred.JobClient: Task Id : attempt_201407141818_0002_m_000018_1, Status : FAILED
java.lang.Throwable: Child Error
        at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271)
Caused by: java.io.IOException: Task process exit with nonzero status of 1.
        at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:258)


attempt_201407141818_0002_m_000018_1: #
attempt_201407141818_0002_m_000018_1: # There is insufficient memory for the Java Runtime Environment to continue.
attempt_201407141818_0002_m_000018_1: # Cannot create GC thread. Out of system resources.
attempt_201407141818_0002_m_000018_1: # An error report file with more information is saved as:

查看系统限制

[root@NameNode ~]# ulimit -a
core file size          (blocks, -c) unlimited
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 2066288
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8

文件数太少了。查看系统的/etc/security/limit.conf，etc/sysctl.conf ，换JDK版本等等，均无果！

在Root下设置 ulimit -c unlimited后，仍然不行。

[hadoop@NameNode mahout-distribution-0.9]$  ulimit -a

max user processes              (-u) 1024
virtual memory          (kbytes, -v) unlimited

经过查证，再在/etc/security/下一看。centos6多出来一个limits.d目录，下面有个文件： 90-nproc.config
此文件内容：
# Default limit for number of user's processes to prevent
# accidental fork bombs.
# See rhbz #432903 for reasoning.


*          soft    nproc     1024
root       soft    nproc     unlimited
这里限制了1024呀，果断注释。

问题解决。