[jira] [Created] (TEZ-2574) Make a better metadata Value split choice in Pipeline sort

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

Saikat created TEZ-2574:
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             Summary: Make a better metadata Value split choice in Pipeline sort
                 Key: TEZ-2574
                 URL: https://issues.apache.org/jira/browse/TEZ-2574
             Project: Apache Tez
          Issue Type: Improvement
            Reporter: Saikat
            Assignee: Saikat
            Priority: Minor


In the current implementation of pipeline sort, when a new sort span object is created with a hard coded value of 1M items and 16 bytes per item.
According to the present code logic, 
      int metasize = METASIZE*maxItems;
      int dataSize = maxItems * perItem;
      if(capacity < (metasize+dataSize)) {
        // try to allocate less meta space, because we have sample data
        metasize = METASIZE*(capacity/(perItem+METASIZE));
      }

if capacity is less than 32mb, the buffer will be halved into meta and value buffers, which is not efficient.
We need a more generic split, based on the KV pair size written to the buffer.




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