hadoop hdfs.xml权限问题导致App Timeline Server服务无法正常启动

近期操作ambari重启ResourceManager的App Timeline Server   服务无法正常启动，ambari界面报错如下：

4 - File['/var/run/hadoop-yarn/yarn/yarn-yarn-timelineserver.pid'] {'action': ['delete'], 'not_if': 'ls /var/run/hadoop-yarn/yarn/yarn-yarn-timelineserver.pid >/dev/null 2>&1 && ps `cat /var/run/hadoop-yarn/yarn/yarn-yarn-timelineserver.pid` >/dev/null 2>&1'}

2016-04-19 19:02:42,747 - Execute['ulimit -c unlimited; export HADOOP_LIBEXEC_DIR=/usr/lib/hadoop/libexec && /usr/lib/hadoop-yarn/sbin/yarn-daemon.sh --config /etc/hadoop/conf start timelineserver'] {'not_if': 'ls /var/run/hadoop-yarn/yarn/yarn-yarn-timelineserver.pid
>/dev/null 2>&1 && ps `cat /var/run/hadoop-yarn/yarn/yarn-yarn-timelineserver.pid` >/dev/null 2>&1', 'user': 'yarn'}

2016-04-19 19:02:43,833 - Execute['ls /var/run/hadoop-yarn/yarn/yarn-yarn-timelineserver.pid >/dev/null 2>&1 && ps `cat /var/run/hadoop-yarn/yarn/yarn-yarn-timelineserver.pid` >/dev/null 2>&1'] {'initial_wait': 5, 'not_if': 'ls /var/run/hadoop-yarn/yarn/yarn-yarn-timelineserver.pid
>/dev/null 2>&1 && ps `cat /var/run/hadoop-yarn/yarn/yarn-yarn-timelineserver.pid` >/dev/null 2>&1', 'user': 'yarn'}

2016-04-19 19:02:48,936 - Error while executing command 'start':

Traceback (most recent call last):

  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 123, in execute

    method(env)

  File "/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/services/YARN/package/scripts/application_timeline_server.py", line 42, in start

    service('timelineserver', action='start')

  File "/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/services/YARN/package/scripts/service.py", line 59, in service

    initial_wait=5

  File "/usr/lib/python2.6/site-packages/resource_management/core/base.py", line 148, in __init__

    self.env.run()

  File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line 149, in run

    self.run_action(resource, action)

  File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line 115, in run_action

    provider_action()

  File "/usr/lib/python2.6/site-packages/resource_management/core/providers/system.py", line 241, in action_run

    raise ex
Fail: Execution of 'ls /var/run/hadoop-yarn/yarn/yarn-yarn-timelineserver.pid >/dev/null 2>&1 && ps `cat /var/run/hadoop-yarn/yarn/yarn-yarn-timelineserver.pid` >/dev/null 2>&1' returned 1.

尝试删除 /var/run/hadoop-yarn/yarn/yarn-yarn-timelineserver.pid文件，再次启动，无果。

到服务器上查看日志，发下如下内容：

vi /var/log/hadoop-yarn/yarn/yarn-yarn-timelineserver.log （根据自己的文件名称）

        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:368)

        at org.apache.hadoop.fs.FileSystem.getLocal(FileSystem.java:339)

        at org.apache.hadoop.yarn.server.timeline.LeveldbTimelineStore.serviceInit(LeveldbTimelineStore.java:183)

        at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)

        at org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:107)

        at org.apache.hadoop.yarn.server.applicationhistoryservice.ApplicationHistoryServer.serviceInit(ApplicationHistoryServer.java:88)

        at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)

        at org.apache.hadoop.yarn.server.applicationhistoryservice.ApplicationHistoryServer.launchAppHistoryServer(ApplicationHistoryServer.java:145)

        at org.apache.hadoop.yarn.server.applicationhistoryservice.ApplicationHistoryServer.main(ApplicationHistoryServer.java:155)
Caused by: java.io.FileNotFoundException: /etc/hadoop/conf.empty/hdfs-site.xml (Permission denied)

        at java.io.FileInputStream.open(Native Method)

        at java.io.FileInputStream.<init>(FileInputStream.java:146)

        at java.io.FileInputStream.<init>(FileInputStream.java:101)

        at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:90)

        at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:188)

        at java.net.URL.openStream(URL.java:1037)

        at org.apache.hadoop.conf.Configuration.parse(Configuration.java:2227)

        at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2298)

        ... 19 more

2016-04-19 19:38:41,373 INFO  util.ExitUtil (ExitUtil.java:terminate(124)) - Exiting with status -1

2016-04-19 19:38:41,375 INFO  applicationhistoryservice.ApplicationHistoryServer (StringUtils.java:run(640)) - SHUTDOWN_MSG:

什么？hdfs-site.xml没有权限

查看下权限ll hdfs-site.xml

-rw------- 1 root   root  7368 Apr 12 16:06 hdfs-site.xml

怎么权限和用户组都不对呢

正常应该是这样的：

-rw-r--r-- 1 hdfs   hadoop 7368 Apr 12 16:06 hdfs-site.xml

修改权限和属主，再次启动服务，正常了。

问了下同事因为之前对这个文件进行了操作修改，复制的时候使用了root用户，对于ambari管理的hadoop建议不要在源码中修改文件，统一在ambari上修改，避免出现不必要的问题。