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From "Sandor Magyari (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AMBARI-17182) App timeline Server start fails on enabling HA because namenode is in safemode
Date Fri, 29 Jul 2016 11:21:20 GMT

     [ https://issues.apache.org/jira/browse/AMBARI-17182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sandor Magyari updated AMBARI-17182:
------------------------------------
    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

> App timeline Server start fails on enabling HA because namenode is in safemode
> ------------------------------------------------------------------------------
>
>                 Key: AMBARI-17182
>                 URL: https://issues.apache.org/jira/browse/AMBARI-17182
>             Project: Ambari
>          Issue Type: Bug
>    Affects Versions: 2.4.0
>            Reporter: Victor Galgo
>            Priority: Critical
>              Labels: ha, namenode
>             Fix For: 2.4.0
>
>         Attachments: nnha_fix.patch
>
>
> On the last step "Start all" on enabling HA below happens:
> {code}
> Traceback (most recent call last):
>   File "/var/lib/ambari-agent/cache/common-services/YARN/2.1.0.2.0/package/scripts/application_timeline_server.py",
line 147, in <module>
>     ApplicationTimelineServer().execute()
>   File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py",
line 219, in execute
>     method(env)
>   File "/var/lib/ambari-agent/cache/common-services/YARN/2.1.0.2.0/package/scripts/application_timeline_server.py",
line 43, in start
>     self.configure(env) # FOR SECURITY
>   File "/var/lib/ambari-agent/cache/common-services/YARN/2.1.0.2.0/package/scripts/application_timeline_server.py",
line 54, in configure
>     yarn(name='apptimelineserver')
>   File "/usr/lib/python2.6/site-packages/ambari_commons/os_family_impl.py", line 89,
in thunk
>     return fn(*args, **kwargs)
>   File "/var/lib/ambari-agent/cache/common-services/YARN/2.1.0.2.0/package/scripts/yarn.py",
line 276, in yarn
>     mode=0755
>   File "/usr/lib/python2.6/site-packages/resource_management/core/base.py", line 154,
in __init__
>     self.env.run()
>   File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line
160, in run
>     self.run_action(resource, action)
>   File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line
124, in run_action
>     provider_action()
>   File "/usr/lib/python2.6/site-packages/resource_management/libraries/providers/hdfs_resource.py",
line 463, in action_create_on_execute
>     self.action_delayed("create")
>   File "/usr/lib/python2.6/site-packages/resource_management/libraries/providers/hdfs_resource.py",
line 460, in action_delayed
>     self.get_hdfs_resource_executor().action_delayed(action_name, self)
>   File "/usr/lib/python2.6/site-packages/resource_management/libraries/providers/hdfs_resource.py",
line 259, in action_delayed
>     self._set_mode(self.target_status)
>   File "/usr/lib/python2.6/site-packages/resource_management/libraries/providers/hdfs_resource.py",
line 366, in _set_mode
>     self.util.run_command(self.main_resource.resource.target, 'SETPERMISSION', method='PUT',
permission=self.mode, assertable_result=False)
>   File "/usr/lib/python2.6/site-packages/resource_management/libraries/providers/hdfs_resource.py",
line 195, in run_command
>     raise Fail(err_msg)
> resource_management.core.exceptions.Fail: Execution of 'curl -sS -L -w '%{http_code}'
-X PUT 'http://os-s11-3-iavzl-nat-s-ru242to25susesecha-12.openstacklocal:50070/webhdfs/v1/ats/done?op=SETPERMISSION&user.name=hdfs&permission=755''
returned status_code=403. 
> {
>   "RemoteException": {
>     "exception": "RetriableException", 
>     "javaClassName": "org.apache.hadoop.ipc.RetriableException", 
>     "message": "org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot set
permission for /ats/done. Name node is in safe mode.\nThe reported blocks 675 needs additional
16 blocks to reach the threshold 0.9900 of total blocks 697.\nThe number of live datanodes
20 has reached the minimum number 0. Safe mode will be turned off automatically once the thresholds
have been reached."
>   }
> }
> {code}
> This happens because NN is not yet out of safemode at the moment of ats start, because
DNs just started.
> To fix this "stop namenodes" has to be triggered before "start all".
> If this is done, on "Start all" it will be ensured that datanodes start prior to NN,
and that NN are out of safemode before ATS start.



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