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From "Rahul Challapalli (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-5453) Managed External Sort : Sorting on a lot of columns is taking unreasonably long time
Date Fri, 28 Apr 2017 21:11:04 GMT
Rahul Challapalli created DRILL-5453:
----------------------------------------

             Summary: Managed External Sort : Sorting on a lot of columns is taking unreasonably
long time
                 Key: DRILL-5453
                 URL: https://issues.apache.org/jira/browse/DRILL-5453
             Project: Apache Drill
          Issue Type: Bug
          Components: Execution - Relational Operators
    Affects Versions: 1.10.0
            Reporter: Rahul Challapalli


The below query ran for ~16hrs before I cancelled it.

{code}
ALTER SESSION SET `exec.sort.disable_managed` = false;
alter session set `planner.memory.max_query_memory_per_node` = 482344960;
alter session set `planner.width.max_per_node` = 1;
alter session set `planner.width.max_per_query` = 1;
select count(*) from (select * from dfs.`/drill/testdata/resource-manager/3500cols.tbl` order
by columns[450],columns[330],columns[230],columns[220],columns[110],columns[90],columns[80],columns[70],columns[40],columns[10],columns[20],columns[30],columns[40],columns[50],
columns[454],columns[413],columns[940],columns[834],columns[73],columns[140],columns[104],columns[2222],columns[30],columns[2420],columns[1520],
columns[1410], columns[1110],columns[1290],columns[2380],columns[705],columns[45],columns[1054],columns[2430],columns[420],columns[404],columns[3350],
columns[3333],columns[153],columns[356],columns[84],columns[745],columns[1450],columns[103],columns[2065],columns[343],columns[3420],columns[530],
columns[3210] ) d where d.col433 = 'sjka skjf';
alter session set `planner.memory.max_query_memory_per_node` = 2147483648;
{code}

The data set and the logs are too large to attach to a jira. But below is a description of
the data
{code}
No of records : 1,000,000
No of columns : 3500
Length of each column : < 50
{code}

The profile is attached and I will give my analysis on why I think its an un-reasonable amount
of time soon.



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