Cheolsoo Park created PIG-3835: ---------------------------------- Summary: Optimize union followed by store Key: PIG-3835 URL: https://issues.apache.org/jira/browse/PIG-3835 Project: Pig Issue Type: Sub-task Components: tez Affects Versions: tez-branch Reporter: Cheolsoo Park Fix For: tez-branch
PIG-3742 implements union using VertexGroup. Currently, union is a blocking operator meaning that a new vertex is added for its succeeding operators. But if there is only one store in the succeeding vertex, MROutput could be directly attached to VertexGroup instead of adding a new vertex for it. Then, each union source vertex will write directly to the destination, and therefore, it will be faster. -- This message was sent by Atlassian JIRA (v6.2#6252)