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Saikat commented on TEZ-2574: ----------------------------- Thanks for the review comments. Will work on the suggested approach. One comment about the small split sizes of 1M entries, I had added the following logic "In order to keep the splits small(according to existing implementation), a min comparison is performed between desired items(1M) and new number items is calculated. min(1M, numitems))" > 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 > Attachments: TEZ-2574.patch > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)