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Datanode on master not getting started

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Datanode on master not getting started

I am unable to start my datanode from Ambari. Namenode, node manager and resource manger are working fine.

The datanode on other 5 hosts are working fine.

This is the log that I am getting:

stderr: 
Traceback (most recent call last):
  File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/datanode.py", line 167, in <module>
    DataNode().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/HDFS/2.1.0.2.0/package/scripts/datanode.py", line 62, in start
    datanode(action="start")
  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/HDFS/2.1.0.2.0/package/scripts/hdfs_datanode.py", line 72, in datanode
    create_log_dir=True
  File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/utils.py", line 267, in service
    Execute(daemon_cmd, not_if=process_id_exists_command, environment=hadoop_env_exports)
  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/core/providers/system.py", line 238, in action_run
    tries=self.resource.tries, try_sleep=self.resource.try_sleep)
  File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 70, in inner
    result = function(command, **kwargs)
  File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 92, in checked_call
    tries=tries, try_sleep=try_sleep)
  File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 140, in _call_wrapper
    result = _call(command, **kwargs_copy)
  File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 291, in _call
    raise Fail(err_msg)
resource_management.core.exceptions.Fail: Execution of 'ambari-sudo.sh su hdfs -l -s /bin/bash -c 'ulimit -c unlimited ;  /usr/hdp/current/hadoop-client/sbin/hadoop-daemon.sh --config /usr/hdp/current/hadoop-client/conf start datanode'' returned 1. starting datanode, logging to /var/log/hadoop/hdfs/hadoop-hdfs-datanode-colo-hdop-prd01.thepartshouse.com.out
 stdout:
2017-07-19 09:27:26,104 - The hadoop conf dir /usr/hdp/current/hadoop-client/conf exists, will call conf-select on it for version 2.4.2.0-258
2017-07-19 09:27:26,104 - Checking if need to create versioned conf dir /etc/hadoop/2.4.2.0-258/0
2017-07-19 09:27:26,105 - call['conf-select create-conf-dir --package hadoop --stack-version 2.4.2.0-258 --conf-version 0'] {'logoutput': False, 'sudo': True, 'quiet': False, 'stderr': -1}
2017-07-19 09:27:26,134 - call returned (1, '/etc/hadoop/2.4.2.0-258/0 exist already', '')
2017-07-19 09:27:26,135 - checked_call['conf-select set-conf-dir --package hadoop --stack-version 2.4.2.0-258 --conf-version 0'] {'logoutput': False, 'sudo': True, 'quiet': False}
2017-07-19 09:27:26,163 - checked_call returned (0, '')
2017-07-19 09:27:26,163 - Ensuring that hadoop has the correct symlink structure
2017-07-19 09:27:26,163 - Using hadoop conf dir: /usr/hdp/current/hadoop-client/conf
2017-07-19 09:27:26,291 - The hadoop conf dir /usr/hdp/current/hadoop-client/conf exists, will call conf-select on it for version 2.4.2.0-258
2017-07-19 09:27:26,291 - Checking if need to create versioned conf dir /etc/hadoop/2.4.2.0-258/0
2017-07-19 09:27:26,291 - call['conf-select create-conf-dir --package hadoop --stack-version 2.4.2.0-258 --conf-version 0'] {'logoutput': False, 'sudo': True, 'quiet': False, 'stderr': -1}
2017-07-19 09:27:26,321 - call returned (1, '/etc/hadoop/2.4.2.0-258/0 exist already', '')
2017-07-19 09:27:26,321 - checked_call['conf-select set-conf-dir --package hadoop --stack-version 2.4.2.0-258 --conf-version 0'] {'logoutput': False, 'sudo': True, 'quiet': False}
2017-07-19 09:27:26,346 - checked_call returned (0, '')
2017-07-19 09:27:26,347 - Ensuring that hadoop has the correct symlink structure
2017-07-19 09:27:26,347 - Using hadoop conf dir: /usr/hdp/current/hadoop-client/conf
2017-07-19 09:27:26,348 - Group['spark'] {}
2017-07-19 09:27:26,349 - Group['hadoop'] {}
2017-07-19 09:27:26,349 - Group['users'] {}
2017-07-19 09:27:26,350 - User['hive'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'hadoop']}
2017-07-19 09:27:26,350 - User['zookeeper'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'hadoop']}
2017-07-19 09:27:26,351 - User['oozie'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'users']}
2017-07-19 09:27:26,352 - User['ams'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'hadoop']}
2017-07-19 09:27:26,352 - User['falcon'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'users']}
2017-07-19 09:27:26,353 - User['tez'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'users']}
2017-07-19 09:27:26,354 - User['mahout'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'hadoop']}
2017-07-19 09:27:26,354 - User['spark'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'hadoop']}
2017-07-19 09:27:26,355 - User['ambari-qa'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'users']}
2017-07-19 09:27:26,355 - User['flume'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'hadoop']}
2017-07-19 09:27:26,356 - User['hdfs'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'hadoop']}
2017-07-19 09:27:26,357 - User['sqoop'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'hadoop']}
2017-07-19 09:27:26,357 - User['yarn'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'hadoop']}
2017-07-19 09:27:26,358 - User['mapred'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'hadoop']}
2017-07-19 09:27:26,358 - User['hcat'] {'gid': 'hadoop', 'fetch_nonlocal_groups': True, 'groups': [u'hadoop']}
2017-07-19 09:27:26,359 - File['/var/lib/ambari-agent/tmp/changeUid.sh'] {'content': StaticFile('changeToSecureUid.sh'), 'mode': 0555}
2017-07-19 09:27:26,361 - Execute['/var/lib/ambari-agent/tmp/changeUid.sh ambari-qa /tmp/hadoop-ambari-qa,/tmp/hsperfdata_ambari-qa,/home/ambari-qa,/tmp/ambari-qa,/tmp/sqoop-ambari-qa'] {'not_if': '(test $(id -u ambari-qa) -gt 1000) || (false)'}
2017-07-19 09:27:26,367 - Skipping Execute['/var/lib/ambari-agent/tmp/changeUid.sh ambari-qa /tmp/hadoop-ambari-qa,/tmp/hsperfdata_ambari-qa,/home/ambari-qa,/tmp/ambari-qa,/tmp/sqoop-ambari-qa'] due to not_if
2017-07-19 09:27:26,368 - Group['hdfs'] {}
2017-07-19 09:27:26,368 - User['hdfs'] {'fetch_nonlocal_groups': True, 'groups': [u'hadoop', u'hdfs']}
2017-07-19 09:27:26,369 - FS Type: 
2017-07-19 09:27:26,369 - Directory['/etc/hadoop'] {'mode': 0755}
2017-07-19 09:27:26,381 - File['/usr/hdp/current/hadoop-client/conf/hadoop-env.sh'] {'content': InlineTemplate(...), 'owner': 'hdfs', 'group': 'hadoop'}
2017-07-19 09:27:26,382 - Directory['/var/lib/ambari-agent/tmp/hadoop_java_io_tmpdir'] {'owner': 'hdfs', 'group': 'hadoop', 'mode': 0777}
2017-07-19 09:27:26,394 - Execute[('setenforce', '0')] {'not_if': '(! which getenforce ) || (which getenforce && getenforce | grep -q Disabled)', 'sudo': True, 'only_if': 'test -f /selinux/enforce'}
2017-07-19 09:27:26,404 - Skipping Execute[('setenforce', '0')] due to only_if
2017-07-19 09:27:26,405 - Directory['/var/log/hadoop'] {'owner': 'root', 'mode': 0775, 'group': 'hadoop', 'recursive': True, 'cd_access': 'a'}
2017-07-19 09:27:26,409 - Directory['/var/run/hadoop'] {'owner': 'root', 'group': 'root', 'recursive': True, 'cd_access': 'a'}
2017-07-19 09:27:26,410 - Changing owner for /var/run/hadoop from 1029 to root
2017-07-19 09:27:26,410 - Changing group for /var/run/hadoop from 1019 to root
2017-07-19 09:27:26,410 - Directory['/tmp/hadoop-hdfs'] {'owner': 'hdfs', 'recursive': True, 'cd_access': 'a'}
2017-07-19 09:27:26,417 - File['/usr/hdp/current/hadoop-client/conf/commons-logging.properties'] {'content': Template('commons-logging.properties.j2'), 'owner': 'hdfs'}
2017-07-19 09:27:26,419 - File['/usr/hdp/current/hadoop-client/conf/health_check'] {'content': Template('health_check.j2'), 'owner': 'hdfs'}
2017-07-19 09:27:26,420 - File['/usr/hdp/current/hadoop-client/conf/log4j.properties'] {'content': ..., 'owner': 'hdfs', 'group': 'hadoop', 'mode': 0644}
2017-07-19 09:27:26,433 - File['/usr/hdp/current/hadoop-client/conf/hadoop-metrics2.properties'] {'content': Template('hadoop-metrics2.properties.j2'), 'owner': 'hdfs', 'group': 'hadoop'}
2017-07-19 09:27:26,433 - File['/usr/hdp/current/hadoop-client/conf/task-log4j.properties'] {'content': StaticFile('task-log4j.properties'), 'mode': 0755}
2017-07-19 09:27:26,434 - File['/usr/hdp/current/hadoop-client/conf/configuration.xsl'] {'owner': 'hdfs', 'group': 'hadoop'}
2017-07-19 09:27:26,438 - File['/etc/hadoop/conf/topology_mappings.data'] {'owner': 'hdfs', 'content': Template('topology_mappings.data.j2'), 'only_if': 'test -d /etc/hadoop/conf', 'group': 'hadoop'}
2017-07-19 09:27:26,445 - File['/etc/hadoop/conf/topology_script.py'] {'content': StaticFile('topology_script.py'), 'only_if': 'test -d /etc/hadoop/conf', 'mode': 0755}
2017-07-19 09:27:26,624 - The hadoop conf dir /usr/hdp/current/hadoop-client/conf exists, will call conf-select on it for version 2.4.2.0-258
2017-07-19 09:27:26,624 - Checking if need to create versioned conf dir /etc/hadoop/2.4.2.0-258/0
2017-07-19 09:27:26,625 - call['conf-select create-conf-dir --package hadoop --stack-version 2.4.2.0-258 --conf-version 0'] {'logoutput': False, 'sudo': True, 'quiet': False, 'stderr': -1}
2017-07-19 09:27:26,649 - call returned (1, '/etc/hadoop/2.4.2.0-258/0 exist already', '')
2017-07-19 09:27:26,650 - checked_call['conf-select set-conf-dir --package hadoop --stack-version 2.4.2.0-258 --conf-version 0'] {'logoutput': False, 'sudo': True, 'quiet': False}
2017-07-19 09:27:26,674 - checked_call returned (0, '')
2017-07-19 09:27:26,674 - Ensuring that hadoop has the correct symlink structure
2017-07-19 09:27:26,674 - Using hadoop conf dir: /usr/hdp/current/hadoop-client/conf
2017-07-19 09:27:26,676 - The hadoop conf dir /usr/hdp/current/hadoop-client/conf exists, will call conf-select on it for version 2.4.2.0-258
2017-07-19 09:27:26,676 - Checking if need to create versioned conf dir /etc/hadoop/2.4.2.0-258/0
2017-07-19 09:27:26,677 - call['conf-select create-conf-dir --package hadoop --stack-version 2.4.2.0-258 --conf-version 0'] {'logoutput': False, 'sudo': True, 'quiet': False, 'stderr': -1}
2017-07-19 09:27:26,720 - call returned (1, '/etc/hadoop/2.4.2.0-258/0 exist already', '')
2017-07-19 09:27:26,721 - checked_call['conf-select set-conf-dir --package hadoop --stack-version 2.4.2.0-258 --conf-version 0'] {'logoutput': False, 'sudo': True, 'quiet': False}
2017-07-19 09:27:26,744 - checked_call returned (0, '')
2017-07-19 09:27:26,745 - Ensuring that hadoop has the correct symlink structure
2017-07-19 09:27:26,745 - Using hadoop conf dir: /usr/hdp/current/hadoop-client/conf
2017-07-19 09:27:26,751 - Directory['/etc/security/limits.d'] {'owner': 'root', 'group': 'root', 'recursive': True}
2017-07-19 09:27:26,757 - File['/etc/security/limits.d/hdfs.conf'] {'content': Template('hdfs.conf.j2'), 'owner': 'root', 'group': 'root', 'mode': 0644}
2017-07-19 09:27:26,758 - XmlConfig['hadoop-policy.xml'] {'owner': 'hdfs', 'group': 'hadoop', 'conf_dir': '/usr/hdp/current/hadoop-client/conf', 'configuration_attributes': {}, 'configurations': ...}
2017-07-19 09:27:26,767 - Generating config: /usr/hdp/current/hadoop-client/conf/hadoop-policy.xml
2017-07-19 09:27:26,767 - File['/usr/hdp/current/hadoop-client/conf/hadoop-policy.xml'] {'owner': 'hdfs', 'content': InlineTemplate(...), 'group': 'hadoop', 'mode': None, 'encoding': 'UTF-8'}
2017-07-19 09:27:26,776 - XmlConfig['ssl-client.xml'] {'owner': 'hdfs', 'group': 'hadoop', 'conf_dir': '/usr/hdp/current/hadoop-client/conf', 'configuration_attributes': {}, 'configurations': ...}
2017-07-19 09:27:26,784 - Generating config: /usr/hdp/current/hadoop-client/conf/ssl-client.xml
2017-07-19 09:27:26,784 - File['/usr/hdp/current/hadoop-client/conf/ssl-client.xml'] {'owner': 'hdfs', 'content': InlineTemplate(...), 'group': 'hadoop', 'mode': None, 'encoding': 'UTF-8'}
2017-07-19 09:27:26,790 - Directory['/usr/hdp/current/hadoop-client/conf/secure'] {'owner': 'root', 'group': 'hadoop', 'recursive': True, 'cd_access': 'a'}
2017-07-19 09:27:26,791 - XmlConfig['ssl-client.xml'] {'owner': 'hdfs', 'group': 'hadoop', 'conf_dir': '/usr/hdp/current/hadoop-client/conf/secure', 'configuration_attributes': {}, 'configurations': ...}
2017-07-19 09:27:26,798 - Generating config: /usr/hdp/current/hadoop-client/conf/secure/ssl-client.xml
2017-07-19 09:27:26,799 - File['/usr/hdp/current/hadoop-client/conf/secure/ssl-client.xml'] {'owner': 'hdfs', 'content': InlineTemplate(...), 'group': 'hadoop', 'mode': None, 'encoding': 'UTF-8'}
2017-07-19 09:27:26,805 - XmlConfig['ssl-server.xml'] {'owner': 'hdfs', 'group': 'hadoop', 'conf_dir': '/usr/hdp/current/hadoop-client/conf', 'configuration_attributes': {}, 'configurations': ...}
2017-07-19 09:27:26,812 - Generating config: /usr/hdp/current/hadoop-client/conf/ssl-server.xml
2017-07-19 09:27:26,813 - File['/usr/hdp/current/hadoop-client/conf/ssl-server.xml'] {'owner': 'hdfs', 'content': InlineTemplate(...), 'group': 'hadoop', 'mode': None, 'encoding': 'UTF-8'}
2017-07-19 09:27:26,820 - XmlConfig['hdfs-site.xml'] {'owner': 'hdfs', 'group': 'hadoop', 'conf_dir': '/usr/hdp/current/hadoop-client/conf', 'configuration_attributes': {}, 'configurations': ...}
2017-07-19 09:27:26,828 - Generating config: /usr/hdp/current/hadoop-client/conf/hdfs-site.xml
2017-07-19 09:27:26,828 - File['/usr/hdp/current/hadoop-client/conf/hdfs-site.xml'] {'owner': 'hdfs', 'content': InlineTemplate(...), 'group': 'hadoop', 'mode': None, 'encoding': 'UTF-8'}
2017-07-19 09:27:26,872 - XmlConfig['core-site.xml'] {'group': 'hadoop', 'conf_dir': '/usr/hdp/current/hadoop-client/conf', 'mode': 0644, 'configuration_attributes': {}, 'owner': 'hdfs', 'configurations': ...}
2017-07-19 09:27:26,879 - Generating config: /usr/hdp/current/hadoop-client/conf/core-site.xml
2017-07-19 09:27:26,879 - File['/usr/hdp/current/hadoop-client/conf/core-site.xml'] {'owner': 'hdfs', 'content': InlineTemplate(...), 'group': 'hadoop', 'mode': 0644, 'encoding': 'UTF-8'}
2017-07-19 09:27:26,901 - File['/usr/hdp/current/hadoop-client/conf/slaves'] {'content': Template('slaves.j2'), 'owner': 'hdfs'}
2017-07-19 09:27:26,902 - Directory['/var/lib/hadoop-hdfs'] {'owner': 'hdfs', 'group': 'hadoop', 'mode': 0751, 'recursive': True}
2017-07-19 09:27:26,908 - Host contains mounts: ['/sys', '/proc', '/dev', '/sys/kernel/security', '/dev/shm', '/dev/pts', '/run', '/sys/fs/cgroup', '/sys/fs/cgroup/systemd', '/sys/fs/pstore', '/sys/fs/cgroup/cpu,cpuacct', '/sys/fs/cgroup/memory', '/sys/fs/cgroup/pids', '/sys/fs/cgroup/freezer', '/sys/fs/cgroup/blkio', '/sys/fs/cgroup/hugetlb', '/sys/fs/cgroup/net_cls,net_prio', '/sys/fs/cgroup/devices', '/sys/fs/cgroup/perf_event', '/sys/fs/cgroup/cpuset', '/sys/kernel/config', '/', '/sys/fs/selinux', '/proc/sys/fs/binfmt_misc', '/sys/kernel/debug', '/dev/hugepages', '/dev/mqueue', '/boot', '/hadoop-data', '/run/user/1000', '/run/user/1003', '/proc/sys/fs/binfmt_misc'].
2017-07-19 09:27:26,908 - Mount point for directory /hadoop-data/hadoop/hdfs/data is /hadoop-data
2017-07-19 09:27:26,909 - File['/var/lib/ambari-agent/data/datanode/dfs_data_dir_mount.hist'] {'content': '\n# This file keeps track of the last known mount-point for each DFS data dir.\n# It is safe to delete, since it will get regenerated the next time that the DataNode starts.\n# However, it is not advised to delete this file since Ambari may\n# re-create a DFS data dir that used to be mounted on a drive but is now mounted on the root.\n# Comments begin with a hash (#) symbol\n# data_dir,mount_point\n/hadoop-data/hadoop/hdfs/data,/hadoop-data\n', 'owner': 'hdfs', 'group': 'hadoop', 'mode': 0644}
2017-07-19 09:27:26,910 - Directory['/var/run/hadoop'] {'owner': 'hdfs', 'group': 'hadoop', 'mode': 0755}
2017-07-19 09:27:26,910 - Changing owner for /var/run/hadoop from 0 to hdfs
2017-07-19 09:27:26,910 - Changing group for /var/run/hadoop from 0 to hadoop
2017-07-19 09:27:26,910 - Directory['/var/run/hadoop/hdfs'] {'owner': 'hdfs', 'recursive': True}
2017-07-19 09:27:26,911 - Directory['/var/log/hadoop/hdfs'] {'owner': 'hdfs', 'recursive': True}
2017-07-19 09:27:26,911 - File['/var/run/hadoop/hdfs/hadoop-hdfs-datanode.pid'] {'action': ['delete'], 'not_if': 'ambari-sudo.sh  -H -E test -f /var/run/hadoop/hdfs/hadoop-hdfs-datanode.pid && ambari-sudo.sh  -H -E pgrep -F /var/run/hadoop/hdfs/hadoop-hdfs-datanode.pid'}
2017-07-19 09:27:26,929 - Deleting File['/var/run/hadoop/hdfs/hadoop-hdfs-datanode.pid']
2017-07-19 09:27:26,930 - Execute['ambari-sudo.sh su hdfs -l -s /bin/bash -c 'ulimit -c unlimited ;  /usr/hdp/current/hadoop-client/sbin/hadoop-daemon.sh --config /usr/hdp/current/hadoop-client/conf start datanode''] {'environment': {'HADOOP_LIBEXEC_DIR': '/usr/hdp/current/hadoop-client/libexec'}, 'not_if': 'ambari-sudo.sh  -H -E test -f /var/run/hadoop/hdfs/hadoop-hdfs-datanode.pid && ambari-sudo.sh  -H -E pgrep -F /var/run/hadoop/hdfs/hadoop-hdfs-datanode.pid'}
7 REPLIES 7
Highlighted

Re: Datanode on master not getting started

Super Mentor

@Saransh Sharma

Can you please try running the following command on the DataNode (which is not starting) manually and let us know if you see any error in the "/var/log/hadoop/hdfs/hadoop-hdfs-datanode-xxxxx.log" or "/var/log/hadoop/hdfs/hadoop-hdfs-datanode-xxxxx,out" file?

# /var/lib/ambari-agent/ambari-sudo.sh su hdfs -l -s /bin/bash -c 'ulimit -c unlimited ;  /usr/hdp/current/hadoop-client/sbin/hadoop-daemon.sh --config /usr/hdp/current/hadoop-client/conf start datanode'

.

- Please share those out and log files of DataNode here.

- Also please check if the PID file is pointing to the currently running DataNode PID.

Example:

# cat /var/run/hadoop/hdfs/hadoop-hdfs-datanode.pid 
2212
# ps -ef | grep DataNode

.

- Also please check if the DataNode has enough Memory.

# free -m

.

Highlighted

Re: Datanode on master not getting started

@Jay SenSharma

This is the log of for /var/log/hadoop/hdfs/hadoop-hdfs-datanode-xxxx.out

ulimit -a for user hdfs
core file size          (blocks, -c) unlimited
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 63398
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 128000
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 65536
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited



Re: Datanode on master not getting started

@Jay SenSharma

Output for free -m

              total        used        free      shared  buff/cache   available
Mem:          15870        3850        2752         648        9268       10931

Also, I guess issue is with pid value. Following is the output that i got:

[root@colo-hdop-prd01 hdfs]# cat hadoop-hdfs-datanode.pid
44745
[root@colo-hdop-prd01 hdfs]# ps -ef | grep DataNode
root      45961  45856  0 02:19 pts/0    00:00:00 grep --color=auto DataNode

Please guide me if I should delete the process or what should I do

Highlighted

Re: Datanode on master not getting started

@Jay SenSharma Could you please help.

Highlighted

Re: Datanode on master not getting started

Super Mentor

@Saransh Sharma

Can you please share the output of the "/var/log/hadoop/hdfs/hadoop-hdfs-datanode-xxxxx.log"

.

Highlighted

Re: Datanode on master not getting started

@Jay SenSharma I have shared the output for it.

Highlighted

Re: Datanode on master not getting started

Super Mentor

@Saransh Sharma

You have posted the output of the "/var/log/hadoop/hdfs/hadoop-hdfs-datanode-xxxx.out" file. We need to see the "/var/log/hadoop/hdfs/hadoop-hdfs-datanode-xxxx.log" file.

Can you please share that file it will be better if you can attach that file here, because that ".log" file may be much larger than the ".out" file.

.