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  1. Apache Whirr (retired)
  2. WHIRR-282

Set number of Hadoop slots based on hardware

        Details

        • Type: Improvement
        • Status: Resolved
        • Priority: Major
        • Resolution: Fixed
        • Affects Version/s: None
        • Fix Version/s: 0.5.0
        • Component/s: service/hadoop
        • Labels:
          None

          Description

          We can use the jclouds node metadata to find out the number of cores per node, and use it to set the mapred.tasktracker.

          {map,reduce}

          .tasks.maximum properties.

            Issue Links

            relates to

            Improvement - An improvement or enhancement to an existing feature or task. WHIRR-229 dynamically calculate hardware requirements

            • Major - Major loss of function.
            • Resolved

              Activity

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              tomwhite Tom White added a comment -

              This patch sets the above Hadoop properties dynamically, as well as mapred.reduce.tasks (to the number of reduce slots in the cluster).

              In addition to the unit test I have run the Hadoop integration test, and tried spinning up a small cluster with larger instance sizes and observed more cluster slots.

              Show
              tomwhite Tom White added a comment - This patch sets the above Hadoop properties dynamically, as well as mapred.reduce.tasks (to the number of reduce slots in the cluster). In addition to the unit test I have run the Hadoop integration test, and tried spinning up a small cluster with larger instance sizes and observed more cluster slots.
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              savu.andrei Andrei Savu added a comment -

              +1 Looks good. I think we can also do a better job at setting a default value for hadoop-mapreduce.mapred.child.java.opts=-Xmx550m.

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              savu.andrei Andrei Savu added a comment - +1 Looks good. I think we can also do a better job at setting a default value for hadoop-mapreduce.mapred.child.java.opts=-Xmx550m .
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              tomwhite Tom White added a comment -

              Good point. I think we can commit this one, and look at the memory options in another JIRA.

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              tomwhite Tom White added a comment - Good point. I think we can commit this one, and look at the memory options in another JIRA.
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              savu.andrei Andrei Savu added a comment -

              I've just committed this. I believe it's a good idea to handle the memory options as part of WHIRR-229.

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              savu.andrei Andrei Savu added a comment - I've just committed this. I believe it's a good idea to handle the memory options as part of WHIRR-229 .

                People

                • Assignee:
                  tomwhite Tom White
                  Reporter:
                  tomwhite Tom White
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                  Dates

                  • Created:
                    Updated:
                    Resolved:

                    Development