[jira] [Created] (IGNITE-4270) Hadoop: optionally stripe mapper output for every partition.

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

Vladimir Ozerov created IGNITE-4270:
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             Summary: Hadoop: optionally stripe mapper output for every partition.
                 Key: IGNITE-4270
                 URL: https://issues.apache.org/jira/browse/IGNITE-4270
             Project: Ignite
          Issue Type: Task
          Components: hadoop
    Affects Versions: 1.8
            Reporter: Vladimir Ozerov
            Assignee: Vladimir Ozerov
             Fix For: 2.0


Currently we have R maps for M mappers, where R is number of reducers. For this reason many mappers writes to concurrent offheap data structure, loosing time on concurrency burden.

Let's add an option to create R * M maps, so that every mapper has dedicated map for every reducer. This will eliminate almost all concurrency overhead.



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