Rajesh Balamohan created HIVE-23735: ---------------------------------------
Summary: Reducer misestimate for export command Key: HIVE-23735 URL: https://issues.apache.org/jira/browse/HIVE-23735 Project: Hive Issue Type: Improvement Reporter: Rajesh Balamohan https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java#L6869 {code} if (dest_tab.getNumBuckets() > 0) { ... } {code} For "export" command, HS2 creates a dummy table and for this table and gets "1" as the number of buckets. {noformat} set hive.stats.autogather=false; export table sample_table to '/tmp/export/sampe_db/t1'; {noformat} This causes issues in reducer estimates and always lands up with '1' as the number of reducer task. -- This message was sent by Atlassian Jira (v8.3.4#803005)