[jira] [Created] (TEZ-2881) Fix the InputBuffer bottleneck during the in-memory spill merge

["Gopal V (JIRA)" <ji...@apache.org>]

Gopal V created TEZ-2881:
----------------------------

             Summary: Fix the InputBuffer bottleneck during the in-memory spill merge
                 Key: TEZ-2881
                 URL: https://issues.apache.org/jira/browse/TEZ-2881
             Project: Apache Tez
          Issue Type: Sub-task
    Affects Versions: 0.8.0-alpha
            Reporter: Gopal V
            Assignee: Gopal V


{code}
  public void reset(ByteBuffer b, int start, int length) {
      resize(length);
      b.position(start);
      b.get(buffer, 0, length);
      super.reset(buffer, 0, length);
    }
{code}

hits cpu-mem bandwidth & is mostly stalled waiting for the data.

Remove this dirty write and switch over to access buffers directly.



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