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From "Rahul Challapalli (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-5505) Enabling exchanges increased the external sorts spill count by 2 times
Date Thu, 11 May 2017 22:06:04 GMT
Rahul Challapalli created DRILL-5505:
----------------------------------------

             Summary: Enabling exchanges increased the external sorts spill count by 2 times
                 Key: DRILL-5505
                 URL: https://issues.apache.org/jira/browse/DRILL-5505
             Project: Apache Drill
          Issue Type: Bug
    Affects Versions: 1.10.0
            Reporter: Rahul Challapalli
            Assignee: Paul Rogers


git.commit.id.abbrev=1e0a14c

Based on the profile, the below query spilled 32 times
{code}
ALTER SESSION SET `exec.sort.disable_managed` = false;
alter session set `planner.width.max_per_node` = 1;
alter session set `planner.width.max_per_node` = 1;
alter session set `planner.disable_exchanges` = true;
alter session set `planner.memory.max_query_memory_per_node` = 62914560;
select count(*) from (select * from dfs.`/drill/testdata/resource-manager/250wide-small.tbl`
order by columns[0])d where d.columns[0] = 'ljdfhwuehnoiueyf';
{code}

Now if I enabled the exchanges, rest all being same, the same query spilled 66 times. I attached
the 2 profiles and the log file.



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