namenode无法通过ambari启动。
raceback (most recent call last):
File "/var/lib/ambari-agent/cache/stacks/HDP/3.0/services/HDFS/package/scripts/namenode.py", line 414, in <module>
NameNode().execute()
File "/usr/lib/ambari-agent/lib/resource_management/libraries/script/script.py", line 353, in execute
method(env)
File "/var/lib/ambari-agent/cache/stacks/HDP/3.0/services/HDFS/package/scripts/namenode.py", line 138, in start
upgrade_suspended=params.upgrade_suspended, env=env)
File "/usr/lib/ambari-agent/lib/ambari_commons/os_family_impl.py", line 89, in thunk
return fn(*args, **kwargs)
File "/var/lib/ambari-agent/cache/stacks/HDP/3.0/services/HDFS/package/scripts/hdfs_namenode.py", line 115, in namenode
format_namenode()
File "/var/lib/ambari-agent/cache/stacks/HDP/3.0/services/HDFS/package/scripts/hdfs_namenode.py", line 369, in format_namenode
logoutput=True
File "/usr/lib/ambari-agent/lib/resource_management/core/base.py", line 166, in __init__
self.env.run()
File "/usr/lib/ambari-agent/lib/resource_management/core/environment.py", line 160, in run
self.run_action(resource, action)
File "/usr/lib/ambari-agent/lib/resource_management/core/environment.py", line 124, in run_action
provider_action()
File "/usr/lib/ambari-agent/lib/resource_management/core/providers/system.py", line 263, in action_run
returns=self.resource.returns)
File "/usr/lib/ambari-agent/lib/resource_management/core/shell.py", line 72, in inner
result = function(command, **kwargs)
File "/usr/lib/ambari-agent/lib/resource_management/core/shell.py", line 102, in checked_call
tries=tries, try_sleep=try_sleep, timeout_kill_strategy=timeout_kill_strategy, returns=returns)
File "/usr/lib/ambari-agent/lib/resource_management/core/shell.py", line 150, in _call_wrapper
result = _call(command, **kwargs_copy)
File "/usr/lib/ambari-agent/lib/resource_management/core/shell.py", line 314, in _call
raise ExecutionFailed(err_msg, code, out, err)
resource_management.core.exceptions.ExecutionFailed: Execution of 'hdfs --config /usr/hdp/3.0.1.0-187/hadoop/conf namenode -format -nonInteractive' returned 1. Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000c8000000, 939524096, 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 939524096 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /var/log/hadoop/hdfs/hs_err_pid2526.log
显然，您安装它的机器内存不足。
您需要添加更多的RAM或调整机器上所有进程的堆大小
内存不足，Java运行时环境无法继续。本机内存分配(mmap(无法映射939524096字节以提交保留内存。
您需要分配更多的RAM，因为现在您没有足够的内存。