There is insufficient memory for the Java Runtime Environment to continue. 解決
在Centos 6.4 X64， JDK 1.7 U21下用hadoop 1.2.1 執行 mahout 0.9，處理一個5GB的資料，系統提示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:
檢視系統限制
[[email protected] ~]# 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
pipe size (512 bytes, -p) 8
檔案數太少了。檢視系統的/etc/security/limit.conf，etc/sysctl.conf ，換JDK版本等等，均無果！
在Root下設定 ulimit -c unlimited後，仍然不行。
[[email protected] mahout-distribution-0.9]$ ulimit -a
max user processes (-u) 1024
virtual memory (kbytes, -v) unlimited
經過查證，再在/etc/security/下一看。centos6多出來一個limits.d目錄，下面有個檔案： 90-nproc.config
此檔案內容：
# 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
這裡限制了1024呀，果斷註釋。
問題解決。
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