FAQ
Hi,

Task tracker failover happens but alive slave instance firstly does copy
the blocks locally and then recover that. Therefore due to copy operation it
takes 7-10 minutes for my test case. To me it looks to be more. Can we have
fastest failover and resume the operation
quickly? Is there anyway to tweak the configuration??

Thanks
Servesh

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  • Gautam Kowshik at Jan 10, 2007 at 11:28 am
    I guess ur confusing data node with task tracker. If a task tracker
    fails the job tracker assigns the task to other task trackers.. and the
    block copy/replication ur refering to, is related datanodes.
    -G.

    Sarvesh Singh wrote:
    Hi,

    Task tracker failover happens but alive slave instance firstly does copy
    the blocks locally and then recover that. Therefore due to copy
    operation it
    takes 7-10 minutes for my test case. To me it looks to be more. Can we
    have
    fastest failover and resume the operation
    quickly? Is there anyway to tweak the configuration??

    Thanks
    Servesh
  • Sarvesh Singh at Jan 10, 2007 at 1:12 pm
    No I am talking about task tracker failover and I saw block copy/replication
    happening there too,
    and it is possible because the failedover instance has to access block which
    may be on victim instance. For map/reduce to work fast, it may want to store
    the block locally, therefore trying to replicate it.

    Thanks
    Servesh

    On 1/10/07, Gautam Kowshik wrote:

    I guess ur confusing data node with task tracker. If a task tracker
    fails the job tracker assigns the task to other task trackers.. and the
    block copy/replication ur refering to, is related datanodes.
    -G.

    Sarvesh Singh wrote:
    Hi,

    Task tracker failover happens but alive slave instance firstly does copy
    the blocks locally and then recover that. Therefore due to copy
    operation it
    takes 7-10 minutes for my test case. To me it looks to be more. Can we
    have
    fastest failover and resume the operation
    quickly? Is there anyway to tweak the configuration??

    Thanks
    Servesh

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groupcommon-user @
categorieshadoop
postedJan 8, '07 at 2:50p
activeJan 10, '07 at 1:12p
posts3
users2
websitehadoop.apache.org...
irc#hadoop

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Sarvesh Singh: 2 posts Gautam Kowshik: 1 post

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