[ https://issues.apache.org/jira/browse/HIVE-17994?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matt McCline updated HIVE-17994: -------------------------------- Fix Version/s: 3.0.0 > Vectorization: Serialization bottlenecked on irrelevant hashmap lookup > ---------------------------------------------------------------------- > > Key: HIVE-17994 > URL: https://issues.apache.org/jira/browse/HIVE-17994 > Project: Hive > Issue Type: Bug > Reporter: Gopal V > Assignee: Matt McCline > Priority: Minor > Fix For: 3.0.0 > > Attachments: HIVE-17994.01.patch, HIVE-17994.02.patch, > HIVE-17994.03.patch, HIVE-17994.04.patch, HIVE-17994.05.patch, > HIVE-17994.06.patch, vec-serialize-hashmap.png > > > On machines with slower NUMA, the hashmap lookup for > TypeInfo::getPrimitiveCategory is the slowest part of the vectorized > serialization loops. The static object references run hot with the NUMA > access speeds penalizing half the threads. > This lookup is done for every column, for every row - though vectorization > enforces that this type cannot change at all. > !vec-serialize-hashmap.png! -- This message was sent by Atlassian JIRA (v6.4.14#64029)