FAQ
Hi,

I used cloudera manager for my CDH4 installation. But I am not seeing
hadoop stop/start service daemons on cluster nodes. whenever I start
the cloudera manager node it is starting agents on cluster nodes and
starting hadoop services. but how can I start these services w/o
cloudera manager node intervention. want to start from data/namnode
itself.

Please advice me.

Thanks.
Chittu

Search Discussions

  • Joey Echeverria at Oct 12, 2012 at 9:03 pm
    Cloudera Manager manages the starting and stopping of daemons
    centrally. If you don't want that, you need to use a manual
    installation method.

    If all you want to do is start/stop from scripts, you could use the CM API:

    https://github.com/cloudera/cm_api

    -Joey
    On Fri, Oct 12, 2012 at 4:29 PM, wrote:
    Hi,

    I used cloudera manager for my CDH4 installation. But I am not seeing
    hadoop stop/start service daemons on cluster nodes. whenever I start
    the cloudera manager node it is starting agents on cluster nodes and
    starting hadoop services. but how can I start these services w/o
    cloudera manager node intervention. want to start from data/namnode
    itself.

    Please advice me.

    Thanks.
    Chittu


    --
    Joey Echeverria
    Principal Solutions Architect
    Cloudera, Inc.
  • Joey Echeverria at Oct 12, 2012 at 9:29 pm
    You can start and stop services that run on a specific node from the
    GUI or form the CM API. However, you cannot from the command line on
    that node unless you write a script to do so using the CM API.

    -Joey
    On Fri, Oct 12, 2012 at 5:26 PM, wrote:
    Thank you Joey for the valid info..

    Do you mean, we can not able stop/start services on specific node in
    cluster using cloudera manager.

    Please confirm that manual method means w/o clouder manager?

    Regards,
    Chittaranjan
    On Fri, Oct 12, 2012 at 1:36 PM, Joey Echeverria wrote:
    Cloudera Manager manages the starting and stopping of daemons
    centrally. If you don't want that, you need to use a manual
    installation method.

    If all you want to do is start/stop from scripts, you could use the CM API:

    https://github.com/cloudera/cm_api

    -Joey
    On Fri, Oct 12, 2012 at 4:29 PM, wrote:
    Hi,

    I used cloudera manager for my CDH4 installation. But I am not seeing
    hadoop stop/start service daemons on cluster nodes. whenever I start
    the cloudera manager node it is starting agents on cluster nodes and
    starting hadoop services. but how can I start these services w/o
    cloudera manager node intervention. want to start from data/namnode
    itself.

    Please advice me.

    Thanks.
    Chittu


    --
    Joey Echeverria
    Principal Solutions Architect
    Cloudera, Inc.


    --
    Joey Echeverria
    Principal Solutions Architect
    Cloudera, Inc.
  • bc Wong at Oct 12, 2012 at 10:04 pm

    On Fri, Oct 12, 2012 at 2:29 PM, Joey Echeverria wrote:

    You can start and stop services that run on a specific node from the
    GUI or form the CM API. However, you cannot from the command line on
    that node unless you write a script to do so using the CM API.

    -Joey
    On Fri, Oct 12, 2012 at 5:26 PM, wrote:
    Thank you Joey for the valid info..

    Do you mean, we can not able stop/start services on specific node in
    cluster using cloudera manager.

    Please confirm that manual method means w/o clouder manager?

    Regards,
    Chittaranjan
    Chittaranjan,

    The "start" and "stop" in Cloudera Manager mean a lot more behind the
    scene. It does config propagation, dependency checking and lots of
    validation. CM is like an automatic car -- stop thinking about manual gear
    shift.

    And as Joey pointed out, you can programmatically start/stop services via
    the API.

    Cheers,
    bc

    On Fri, Oct 12, 2012 at 1:36 PM, Joey Echeverria wrote:
    Cloudera Manager manages the starting and stopping of daemons
    centrally. If you don't want that, you need to use a manual
    installation method.

    If all you want to do is start/stop from scripts, you could use the CM
    API:
    https://github.com/cloudera/cm_api

    -Joey
    On Fri, Oct 12, 2012 at 4:29 PM, wrote:
    Hi,

    I used cloudera manager for my CDH4 installation. But I am not seeing
    hadoop stop/start service daemons on cluster nodes. whenever I start
    the cloudera manager node it is starting agents on cluster nodes and
    starting hadoop services. but how can I start these services w/o
    cloudera manager node intervention. want to start from data/namnode
    itself.

    Please advice me.

    Thanks.
    Chittu


    --
    Joey Echeverria
    Principal Solutions Architect
    Cloudera, Inc.


    --
    Joey Echeverria
    Principal Solutions Architect
    Cloudera, Inc.
  • bc Wong at Oct 12, 2012 at 10:45 pm

    On Fri, Oct 12, 2012 at 3:35 PM, wrote:

    Thank you Wong..

    But I am worrying like, if cloudera manager node is dead what is the
    way to stop/start services on particular node in cluster.

    kindly advice me.

    Thanks.
    Chittu

    [Please reply-all, to include the mailing list.]

    CM does not have HA capability today. But at the same time, this has never
    been a problem in all the deployments that I've seen. Services aren't
    impacted when CM goes down. So you do have some leeway to bring CM back up.
    And assuming the database is still alive, it's not hard to start a new CM
    on another node.

    Cheers,
    bc



    On Fri, Oct 12, 2012 at 3:04 PM, bc Wong wrote:
    On Fri, Oct 12, 2012 at 2:29 PM, Joey Echeverria wrote:

    You can start and stop services that run on a specific node from the
    GUI or form the CM API. However, you cannot from the command line on
    that node unless you write a script to do so using the CM API.

    -Joey
    On Fri, Oct 12, 2012 at 5:26 PM, wrote:
    Thank you Joey for the valid info..

    Do you mean, we can not able stop/start services on specific node in
    cluster using cloudera manager.

    Please confirm that manual method means w/o clouder manager?

    Regards,
    Chittaranjan

    Chittaranjan,

    The "start" and "stop" in Cloudera Manager mean a lot more behind the scene.
    It does config propagation, dependency checking and lots of validation. CM
    is like an automatic car -- stop thinking about manual gear shift.

    And as Joey pointed out, you can programmatically start/stop services via
    the API.

    Cheers,
    bc
    On Fri, Oct 12, 2012 at 1:36 PM, Joey Echeverria <joey@cloudera.com>
    wrote:
    Cloudera Manager manages the starting and stopping of daemons
    centrally. If you don't want that, you need to use a manual
    installation method.

    If all you want to do is start/stop from scripts, you could use the
    CM
    API:

    https://github.com/cloudera/cm_api

    -Joey
    On Fri, Oct 12, 2012 at 4:29 PM, wrote:
    Hi,

    I used cloudera manager for my CDH4 installation. But I am not
    seeing
    hadoop stop/start service daemons on cluster nodes. whenever I start
    the cloudera manager node it is starting agents on cluster nodes and
    starting hadoop services. but how can I start these services w/o
    cloudera manager node intervention. want to start from data/namnode
    itself.

    Please advice me.

    Thanks.
    Chittu


    --
    Joey Echeverria
    Principal Solutions Architect
    Cloudera, Inc.


    --
    Joey Echeverria
    Principal Solutions Architect
    Cloudera, Inc.
  • Chittu546 at Oct 12, 2012 at 11:16 pm
    Thank you Wong for your info...much appreciated.

    Chittu
    On Fri, Oct 12, 2012 at 3:44 PM, bc Wong wrote:
    On Fri, Oct 12, 2012 at 3:35 PM, wrote:

    Thank you Wong..

    But I am worrying like, if cloudera manager node is dead what is the
    way to stop/start services on particular node in cluster.

    kindly advice me.

    Thanks.
    Chittu

    [Please reply-all, to include the mailing list.]

    CM does not have HA capability today. But at the same time, this has never
    been a problem in all the deployments that I've seen. Services aren't
    impacted when CM goes down. So you do have some leeway to bring CM back up.
    And assuming the database is still alive, it's not hard to start a new CM on
    another node.

    Cheers,
    bc


    On Fri, Oct 12, 2012 at 3:04 PM, bc Wong wrote:
    On Fri, Oct 12, 2012 at 2:29 PM, Joey Echeverria <joey@cloudera.com>
    wrote:
    You can start and stop services that run on a specific node from the
    GUI or form the CM API. However, you cannot from the command line on
    that node unless you write a script to do so using the CM API.

    -Joey
    On Fri, Oct 12, 2012 at 5:26 PM, wrote:
    Thank you Joey for the valid info..

    Do you mean, we can not able stop/start services on specific node in
    cluster using cloudera manager.

    Please confirm that manual method means w/o clouder manager?

    Regards,
    Chittaranjan

    Chittaranjan,

    The "start" and "stop" in Cloudera Manager mean a lot more behind the
    scene.
    It does config propagation, dependency checking and lots of validation.
    CM
    is like an automatic car -- stop thinking about manual gear shift.

    And as Joey pointed out, you can programmatically start/stop services
    via
    the API.

    Cheers,
    bc
    On Fri, Oct 12, 2012 at 1:36 PM, Joey Echeverria <joey@cloudera.com>
    wrote:
    Cloudera Manager manages the starting and stopping of daemons
    centrally. If you don't want that, you need to use a manual
    installation method.

    If all you want to do is start/stop from scripts, you could use the
    CM
    API:

    https://github.com/cloudera/cm_api

    -Joey
    On Fri, Oct 12, 2012 at 4:29 PM, wrote:
    Hi,

    I used cloudera manager for my CDH4 installation. But I am not
    seeing
    hadoop stop/start service daemons on cluster nodes. whenever I
    start
    the cloudera manager node it is starting agents on cluster nodes
    and
    starting hadoop services. but how can I start these services w/o
    cloudera manager node intervention. want to start from data/namnode
    itself.

    Please advice me.

    Thanks.
    Chittu


    --
    Joey Echeverria
    Principal Solutions Architect
    Cloudera, Inc.


    --
    Joey Echeverria
    Principal Solutions Architect
    Cloudera, Inc.

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postedOct 12, '12 at 8:29p
activeOct 12, '12 at 11:16p
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