Install cluster

Enable Namenode HA

Start RU

"Zookeeper" is completed

"Core Masters" failed on RESTART HDFS/JOURNALNODE:

Traceback (most recent call last):  File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/journalnode.py", line 158, in 
     
          JournalNode().execute()  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 184, in execute    method(env)  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 350, in restart    self.post_rolling_restart(env)  File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/journalnode.py", line 72, in post_rolling_restart    journalnode_upgrade.post_upgrade_check()  File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/journalnode_upgrade.py", line 66, in post_upgrade_check    success = ensure_jns_have_new_txn(all_journal_node_hosts, last_txn_id)  File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/journalnode_upgrade.py", line 133, in ensure_jns_have_new_txn    data = get_jmx_data(url, 'Journal-', 'LastWrittenTxId')  File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/utils.py", line 241, in get_jmx_data    data = urllib2.urlopen(nn_address).read()  File "/usr/lib64/python2.6/urllib2.py", line 126, in urlopen    return _opener.open(url, data, timeout)  File "/usr/lib64/python2.6/urllib2.py", line 391, in open    response = self._open(req, data)  File "/usr/lib64/python2.6/urllib2.py", line 409, in _open    '_open', req)  File "/usr/lib64/python2.6/urllib2.py", line 369, in _call_chain    result = func(*args)  File "/usr/lib64/python2.6/urllib2.py", line 1198, in https_open    return self.do_open(httplib.HTTPSConnection, req)  File "/usr/lib64/python2.6/urllib2.py", line 1165, in do_open    raise URLError(err)urllib2.URLError: