FAQ
Hi All,


When I run a host inspector validation on my hosts I get the following
message:
"The numeric user id of the HDFS user varies across hosts. This may cause
issues with some NFS servers if the NameNode uses data directories stored
on shared storage."

Is there any known way to get rid of this error? I followed the Path B
method of installation for CDH4 and CM4.

Thanks
Sambit.

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  • Sambit Tripathy at Jul 26, 2012 at 10:37 am
    Currently we do not use any shared storage and future also we are not
    planning to do so, on the other hand just to get rid of this error message
    if I go and change the numeric user under /etc/passwd will not be a good
    idea since some files already created by HDFS will refer to the old uid.

    Shall I just ignore this error message and run the services?


    On Thursday, July 26, 2012 2:12:54 PM UTC+5:30, Sambit Tripathy wrote:

    Hi All,


    When I run a host inspector validation on my hosts I get the following
    message:
    "The numeric user id of the HDFS user varies across hosts. This may cause
    issues with some NFS servers if the NameNode uses data directories stored
    on shared storage."

    Is there any known way to get rid of this error? I followed the Path B
    method of installation for CDH4 and CM4.

    Thanks
    Sambit.
  • Philip Langdale at Jul 26, 2012 at 4:53 pm
    It's fine to ignore the error if you don't plan to use shared storage.

    --phil


    On 26 July 2012 03:36, Sambit Tripathy wrote:

    Currently we do not use any shared storage and future also we are not
    planning to do so, on the other hand just to get rid of this error message
    if I go and change the numeric user under /etc/passwd will not be a good
    idea since some files already created by HDFS will refer to the old uid.

    Shall I just ignore this error message and run the services?



    On Thursday, July 26, 2012 2:12:54 PM UTC+5:30, Sambit Tripathy wrote:

    Hi All,


    When I run a host inspector validation on my hosts I get the following
    message:
    "The numeric user id of the HDFS user varies across hosts. This may cause
    issues with some NFS servers if the NameNode uses data directories stored
    on shared storage."

    Is there any known way to get rid of this error? I followed the Path B
    method of installation for CDH4 and CM4.

    Thanks
    Sambit.
  • Venkata Gattala at Mar 4, 2013 at 5:57 am
    if i use usrmod and change the number of the account hdfs hwo will that
    impact, will it cause any further issue to the cluster at the later point?
    On Thursday, July 26, 2012 11:53:04 AM UTC-5, Philip Langdale wrote:

    It's fine to ignore the error if you don't plan to use shared storage.

    --phil



    On 26 July 2012 03:36, Sambit Tripathy <samb...@gmail.com <javascript:>>wrote:
    Currently we do not use any shared storage and future also we are not
    planning to do so, on the other hand just to get rid of this error message
    if I go and change the numeric user under /etc/passwd will not be a good
    idea since some files already created by HDFS will refer to the old uid.

    Shall I just ignore this error message and run the services?



    On Thursday, July 26, 2012 2:12:54 PM UTC+5:30, Sambit Tripathy wrote:

    Hi All,


    When I run a host inspector validation on my hosts I get the following
    message:
    "The numeric user id of the HDFS user varies across hosts. This may
    cause issues with some NFS servers if the NameNode uses data directories
    stored on shared storage."

    Is there any known way to get rid of this error? I followed the Path B
    method of installation for CDH4 and CM4.

    Thanks
    Sambit.
  • Harsh J at Mar 4, 2013 at 6:13 am
    Hi Venkata,

    Why do you seek to change the UIDs/GIDs of the installed users? Are
    they posing problems?
    On Mon, Mar 4, 2013 at 11:27 AM, Venkata Gattala wrote:
    if i use usrmod and change the number of the account hdfs hwo will that
    impact, will it cause any further issue to the cluster at the later point?
    On Thursday, July 26, 2012 11:53:04 AM UTC-5, Philip Langdale wrote:

    It's fine to ignore the error if you don't plan to use shared storage.

    --phil


    On 26 July 2012 03:36, Sambit Tripathy wrote:

    Currently we do not use any shared storage and future also we are not
    planning to do so, on the other hand just to get rid of this error message
    if I go and change the numeric user under /etc/passwd will not be a good
    idea since some files already created by HDFS will refer to the old uid.

    Shall I just ignore this error message and run the services?



    On Thursday, July 26, 2012 2:12:54 PM UTC+5:30, Sambit Tripathy wrote:

    Hi All,


    When I run a host inspector validation on my hosts I get the following
    message:
    "The numeric user id of the HDFS user varies across hosts. This may
    cause issues with some NFS servers if the NameNode uses data directories
    stored on shared storage."

    Is there any known way to get rid of this error? I followed the Path B
    method of installation for CDH4 and CM4.

    Thanks
    Sambit.


    --
    Harsh J
  • bc Wong at Mar 4, 2013 at 6:58 am

    On Sun, Mar 3, 2013 at 9:57 PM, Venkata Gattala wrote:

    if i use usrmod and change the number of the account hdfs hwo will that
    impact, will it cause any further issue to the cluster at the later point?
    Venkata,

    The user id mismatch is only an issue if you plan to use NFS shared storage
    for HA. Since CDH 4.1, a much better form of HA (quorum-based) is
    available, so we don't recommend the NFS-based HA anymore. You should use
    that instead, and not worry about uid mismatch.

    Cheers,
    bc

    On Thursday, July 26, 2012 11:53:04 AM UTC-5, Philip Langdale wrote:

    It's fine to ignore the error if you don't plan to use shared storage.

    --phil


    On 26 July 2012 03:36, Sambit Tripathy wrote:

    Currently we do not use any shared storage and future also we are not
    planning to do so, on the other hand just to get rid of this error message
    if I go and change the numeric user under /etc/passwd will not be a good
    idea since some files already created by HDFS will refer to the old uid.

    Shall I just ignore this error message and run the services?



    On Thursday, July 26, 2012 2:12:54 PM UTC+5:30, Sambit Tripathy wrote:

    Hi All,


    When I run a host inspector validation on my hosts I get the following
    message:
    "The numeric user id of the HDFS user varies across hosts. This may
    cause issues with some NFS servers if the NameNode uses data directories
    stored on shared storage."

    Is there any known way to get rid of this error? I followed the Path B
    method of installation for CDH4 and CM4.

    Thanks
    Sambit.

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postedJul 26, '12 at 8:42a
activeMar 4, '13 at 6:58a
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