Robert Levas created AMBARI-20349:
-------------------------------------
Summary: When SPNEGO authentication is enabled for Hadoop in a
cluster with NN HA, PXF Process alert fails
Key: AMBARI-20349
URL: https://issues.apache.org/jira/browse/AMBARI-20349
Project: Ambari
Issue Type: Bug
Components: ambari-server
Affects Versions: 2.2.2
Reporter: Robert Levas
Assignee: Robert Levas
Fix For: 2.5.0
When SPNEGO authentication is enabled for Hadoop in a cluster where NN HA is
enabled, PXF Process alert fails with the following errors in the
ambari-agent.log file
{noformat}
ERROR 2017-03-07 18:03:58,417 jmx.py:44 - Getting jmx metrics from NN failed.
URL:
http://c6401.ambari.apache.org:50070/jmx?qry=Hadoop:service=NameNode,name=FSNamesy
stem
Traceback (most recent call last):
File
"/usr/lib/python2.6/site-packages/resource_management/libraries/functions/jmx.py",
line 41, in get_value_from_jmx
data_dict = json.loads(data)
File "/usr/lib/python2.6/site-packages/ambari_simplejson/__init__.py", line
307, in loads
return _default_decoder.decode(s)
File "/usr/lib/python2.6/site-packages/ambari_simplejson/decoder.py", line
335, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python2.6/site-packages/ambari_simplejson/decoder.py", line
353, in raw_decode
raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded
INFO 2017-03-07 18:04:02,769 logger.py:71 - call['ambari-sudo.sh su hdfs -l -s
/bin/bash -c 'curl --negotiate -u : -s
'"'"'http://c6402.ambari.apache.org:50070/jmx?qry=Hadoop:service=NameNode,name=FSNamesystem'"'"'
1>/tmp/tmphTXg76 2>/tmp/tmp5bm2nM''] {'quiet': False}
INFO 2017-03-07 18:04:02,797 logger.py:71 - call returned (0, '')
ERROR 2017-03-07 18:04:02,798 jmx.py:44 - Getting jmx metrics from NN failed.
URL:
http://c6402.ambari.apache.org:50070/jmx?qry=Hadoop:service=NameNode,name=FSNamesystem
Traceback (most recent call last):
File
"/usr/lib/python2.6/site-packages/resource_management/libraries/functions/jmx.py",
line 41, in get_value_from_jmx
data_dict = json.loads(data)
File "/usr/lib/python2.6/site-packages/ambari_simplejson/__init__.py", line
307, in loads
return _default_decoder.decode(s)
File "/usr/lib/python2.6/site-packages/ambari_simplejson/decoder.py", line
335, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python2.6/site-packages/ambari_simplejson/decoder.py", line
353, in raw_decode
raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded
{noformat}
*Cause*
During the test for the {{PXF Process}} alert, the Active NN is found using a
JMX call. This call requires SPNEGO authentication since SPNEGO authentication
is turned on for the Hadoop web interfaces. However, a valid Kerberos ticket is
not found in the configured user's Kerberos ticket cache. In this case, the
configured users is the HDFS user - which technically is not necessary.
This occurs in
{code:title=common-services/PXF/3.0.0/package/alerts/api_status.py:137}
if CLUSTER_ENV_SECURITY in configurations and
configurations[CLUSTER_ENV_SECURITY].lower() == "true":
if 'dfs.nameservices' in configurations[HDFS_SITE]:
namenode_address =
get_active_namenode(ConfigDictionary(configurations[HDFS_SITE]),
configurations[CLUSTER_ENV_SECURITY], configurations[HADOOP_ENV_HDFS_USER])[1]
else:
namenode_address =
configurations[HDFS_SITE]['dfs.namenode.http-address']
token = _get_delegation_token(namenode_address,
configurations[HADOOP_ENV_HDFS_USER],
configurations[HADOOP_ENV_HDFS_USER_KEYTAB],
configurations[HADOOP_ENV_HDFS_PRINCIPAL_NAME],
None)
commonPXFHeaders.update({"X-GP-TOKEN": token})
{code}
Inside the call at
{code}
namenode_address =
get_active_namenode(ConfigDictionary(configurations[HDFS_SITE]),
configurations[CLUSTER_ENV_SECURITY], configurations[HADOOP_ENV_HDFS_USER])[1]
{code}
*Solution*
Ensure the configured user's Kerberos ticket cache contains a valid ticket
before querying for the active NN. Possibly change the acting user to one
executing the PXF component.
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