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https://issues.apache.org/jira/browse/DRILL-5755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16181833#comment-16181833
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ASF GitHub Bot commented on DRILL-5755:
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GitHub user ilooner opened a pull request:
https://github.com/apache/drill/pull/964
DRILL-5755 Reduced default number of batches kept in memory by TopN
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ilooner/drill DRILL-5755
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/964.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #964
----
commit 80ff848a419b65ae578a382a24971a01d97f2eb0
Author: Timothy Farkas <[email protected]>
Date: 2017-09-21T22:59:58Z
DRILL-5755 Reduced default number of batches kept in memory by the TopN
operator.
----
> TOP_N_SORT operator does not free memory while running
> ------------------------------------------------------
>
> Key: DRILL-5755
> URL: https://issues.apache.org/jira/browse/DRILL-5755
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Relational Operators
> Affects Versions: 1.11.0
> Reporter: Boaz Ben-Zvi
> Assignee: Timothy Farkas
> Priority: Blocker
> Attachments: 2658c253-20b6-db90-362a-139aae4a327e.sys.drill
>
>
> The TOP_N_SORT operator should keep the top N rows while processing its
> input, and free the memory used to hold all rows below the top N.
> For example, the following query uses a table with 125M rows:
> {code}
> select row_count, sum(row_count), avg(double_field), max(double_rand),
> count(float_rand) from dfs.`/data/tmp` group by row_count order by row_count
> limit 30;
> {code}
> And failed with an OOM when each of the 3 TOP_N_SORT operators was holding
> about 2.44 GB !! (see attached profile). It should take far less memory to
> hold 30 rows !!
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