Hiya, I'm using HIVE 0.7.1 with 1) moderate 50GB table, let's call it `temp_view` 2) query: select max(length(get_json_object(json, '$.user_id'))) from temp_view. From my point of view this query is a total joke, nothing serious.
Query runs just fine, everyone's happy. But I have massive memory consumption at the map phase: 7 active mappers eating 500 Mb of RAM each. This is a really bad stuff, it means real mappers on real queries will throw OutOfMemory exception (they do throw it actually). Anyone has any ideas of what I'm doing wrong? Cause I have zero.
