I have looked up how to up this value on the web and have tried all
suggestions to no avail.

Any help would be great.

Here is some background:

Version: 0.20.2, r911707
Compiled: Fri Feb 19 08:07:34 UTC 2010 by chrisdo

Nodes: 5
Current Map Task Capacity : 10  <--- this is what I want to increase.

What I have tried :

Adding
   <property>
    <name>mapred.tasktracker.map.tasks.maximum</name>
    <value>8</value>
    <final>true</final>
  </property>
to mapred-site.xml on NameNode.  I also added this to one of the
datanodes for the hell of it and that didn't work either.

Thanks.

Joey

What is it do you really want to do? Increase the number of map slots available in the task tracker  or do you want to increase the number of map tasks for a job?

If you want to increase the number of map slots available, what you did will work - as long as you restarted the task tracker or the node.
If you want to increase the number of map jobs - you will have to play with, simplistically speaking, either the number of input files or input block size.

Raj

>________________________________
> From: Joey Krabacher <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Sent: Thursday, December 15, 2011 3:30 PM
>Subject: Map Task Capacity Not Changing
>
>I have looked up how to up this value on the web and have tried all
>suggestions to no avail.
>
>Any help would be great.
>
>Here is some background:
>
>Version: 0.20.2, r911707
>Compiled: Fri Feb 19 08:07:34 UTC 2010 by chrisdo
>
>Nodes: 5
>Current Map Task Capacity : 10  <--- this is what I want to increase.
>
>What I have tried :
>
>Adding
>   <property>
>    <name>mapred.tasktracker.map.tasks.maximum</name>
>    <value>8</value>
>    <final>true</final>
>  </property>
>to mapred-site.xml on NameNode.  I also added this to one of the
>datanodes for the hell of it and that didn't work either.
>
>Thanks.
>
>
>

Turns out my tasktrackers(on the datanodes) are not starting properly....

so I guess they are taking some alternate route??

because they are up and running...even though when I run
stop-mapred.sh it says "data01: no tasktracker to stop"

--Joey

On Thu, Dec 15, 2011 at 5:37 PM, James Warren
<[EMAIL PROTECTED]> wrote:
> (moving to mapreduce-user@, bcc'ing common-user@)
>
> Hi Joey -
>
> You'll want to change the value on all of your servers running tasktrackers
> and then restart each tasktracker to reread the configuration.
>
> cheers,
> -James
>
> On Thu, Dec 15, 2011 at 3:30 PM, Joey Krabacher <[EMAIL PROTECTED]>wrote:
>
>> I have looked up how to up this value on the web and have tried all
>> suggestions to no avail.
>>
>> Any help would be great.
>>
>> Here is some background:
>>
>> Version: 0.20.2, r911707
>> Compiled: Fri Feb 19 08:07:34 UTC 2010 by chrisdo
>>
>> Nodes: 5
>> Current Map Task Capacity : 10  <--- this is what I want to increase.
>>
>> What I have tried :
>>
>> Adding
>>   <property>
>>    <name>mapred.tasktracker.map.tasks.maximum</name>
>>    <value>8</value>
>>    <final>true</final>
>>  </property>
>> to mapred-site.xml on NameNode.  I also added this to one of the
>> datanodes for the hell of it and that didn't work either.
>>
>> Thanks.
>>

You might be suffering from HADOOP-7822; I'd suggest you verify your pid
files and fix the problem by hand if it is the same issue.

-Rahul

On Fri, Dec 16, 2011 at 2:40 PM, Joey Krabacher <[EMAIL PROTECTED]>wrote:

> Turns out my tasktrackers(on the datanodes) are not starting properly....
>
> so I guess they are taking some alternate route??
>
> because they are up and running...even though when I run
> stop-mapred.sh it says "data01: no tasktracker to stop"
>
> --Joey
>
> On Thu, Dec 15, 2011 at 5:37 PM, James Warren
> <[EMAIL PROTECTED]> wrote:
> > (moving to mapreduce-user@, bcc'ing common-user@)
> >
> > Hi Joey -
> >
> > You'll want to change the value on all of your servers running
> tasktrackers
> > and then restart each tasktracker to reread the configuration.
> >
> > cheers,
> > -James
> >
> > On Thu, Dec 15, 2011 at 3:30 PM, Joey Krabacher <[EMAIL PROTECTED]
> >wrote:
> >
> >> I have looked up how to up this value on the web and have tried all
> >> suggestions to no avail.
> >>
> >> Any help would be great.
> >>
> >> Here is some background:
> >>
> >> Version: 0.20.2, r911707
> >> Compiled: Fri Feb 19 08:07:34 UTC 2010 by chrisdo
> >>
> >> Nodes: 5
> >> Current Map Task Capacity : 10  <--- this is what I want to increase.
> >>
> >> What I have tried :
> >>
> >> Adding
> >>   <property>
> >>    <name>mapred.tasktracker.map.tasks.maximum</name>
> >>    <value>8</value>
> >>    <final>true</final>
> >>  </property>
> >> to mapred-site.xml on NameNode.  I also added this to one of the
> >> datanodes for the hell of it and that didn't work either.
> >>
> >> Thanks.
> >>
>

pid files are there, I checked for running processes with the same
ID's and they all checked out.

--Joey

On Fri, Dec 16, 2011 at 5:40 PM, Rahul Jain <[EMAIL PROTECTED]> wrote:
> You might be suffering from HADOOP-7822; I'd suggest you verify your pid
> files and fix the problem by hand if it is the same issue.
>
> -Rahul
>
> On Fri, Dec 16, 2011 at 2:40 PM, Joey Krabacher <[EMAIL PROTECTED]>wrote:
>
>> Turns out my tasktrackers(on the datanodes) are not starting properly....
>>
>> so I guess they are taking some alternate route??
>>
>> because they are up and running...even though when I run
>> stop-mapred.sh it says "data01: no tasktracker to stop"
>>
>> --Joey
>>
>> On Thu, Dec 15, 2011 at 5:37 PM, James Warren
>> <[EMAIL PROTECTED]> wrote:
>> > (moving to mapreduce-user@, bcc'ing common-user@)
>> >
>> > Hi Joey -
>> >
>> > You'll want to change the value on all of your servers running
>> tasktrackers
>> > and then restart each tasktracker to reread the configuration.
>> >
>> > cheers,
>> > -James
>> >
>> > On Thu, Dec 15, 2011 at 3:30 PM, Joey Krabacher <[EMAIL PROTECTED]
>> >wrote:
>> >
>> >> I have looked up how to up this value on the web and have tried all
>> >> suggestions to no avail.
>> >>
>> >> Any help would be great.
>> >>
>> >> Here is some background:
>> >>
>> >> Version: 0.20.2, r911707
>> >> Compiled: Fri Feb 19 08:07:34 UTC 2010 by chrisdo
>> >>
>> >> Nodes: 5
>> >> Current Map Task Capacity : 10  <--- this is what I want to increase.
>> >>
>> >> What I have tried :
>> >>
>> >> Adding
>> >>   <property>
>> >>    <name>mapred.tasktracker.map.tasks.maximum</name>
>> >>    <value>8</value>
>> >>    <final>true</final>
>> >>  </property>
>> >> to mapred-site.xml on NameNode.  I also added this to one of the
>> >> datanodes for the hell of it and that didn't work either.
>> >>
>> >> Thanks.
>> >>
>>