[
https://issues.apache.org/jira/browse/DRILL-4278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15104019#comment-15104019
]
jean-claude edited comment on DRILL-4278 at 1/18/16 1:09 AM:
-------------------------------------------------------------
I did another test using 18 JSON files containing each a single object with a
single field.
{
"name" : "lajsdlfjsklfjsdlkfjsldf jslfslkjfklsdj
fklsjflksdjflksdjflja;kjflkdsjfkljdfsf d
fkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsadkjfksadjfkj"
}
If run this query thousands of times the heap usage goes up and up.
select name from dfs.`/Users/jccote/json/` limit 4;
On the other hand if I run this query (the limit is the same as the size of the
db so there are no rows actually removed) thousands of times there is
absolutely no problem.
select name from dfs.`/Users/jccote/json/` limit 18;
There's definitely something leaking when rows are taken out of the result set.
was (Author: jccote):
I did another test using 18 JSON files containing each a single object with a
single field.
{
"name" : "lajsdlfjsklfjsdlkfjsldf jslfslkjfklsdj
fklsjflksdjflksdjflja;kjflkdsjfkljdfsf d
fkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsdfjdalkfjasjfaldsjfljfkldajsfkljaklfjksajfjaslfjakljfkljfkldsajfkldsjfksdjfklsajfkljklasjfkldsjklfjkdlsjfklsdjfkljsdklafjkldjafkldj
asklfjskldafjklsdjfjdsfkjdsfkjsadkjfksadjfkj"
}
If run this query thousands of times the heap usage goes up and up.
select * from dfs.`/Users/jccote/json/` limit 4;
On the other hand if I run this query (the limit is the same as the size of the
db so there are no rows actually removed) thousands of times there is
absolutely no problem.
select * from dfs.`/Users/jccote/json/` limit 18;
There's definitely something leaking when rows are taken out of the result set.
> Memory leak when using LIMIT
> ----------------------------
>
> Key: DRILL-4278
> URL: https://issues.apache.org/jira/browse/DRILL-4278
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - RPC
> Affects Versions: 1.4.0, 1.5.0
> Environment: OS X
> 0: jdbc:drill:zk=local> select * from sys.version;
> +----------+-------------------------------------------+-----------------------------------------------------+----------------------------+----------------------------+----------------------------+
> | version | commit_id |
> commit_message | commit_time |
> build_email | build_time |
> +----------+-------------------------------------------+-----------------------------------------------------+----------------------------+----------------------------+----------------------------+
> | 1.4.0 | 32b871b24c7b69f59a1d2e70f444eed6e599e825 |
> [maven-release-plugin] prepare release drill-1.4.0 | 08.12.2015 @ 00:24:59
> PST | [email protected] | 08.12.2015 @ 01:14:39 PST |
> +----------+-------------------------------------------+-----------------------------------------------------+----------------------------+----------------------------+----------------------------+
> 0: jdbc:drill:zk=local> select * from sys.options where status <> 'DEFAULT';
> +-----------------------------+-------+---------+----------+----------+-------------+-----------+------------+
> | name | kind | type | status | num_val |
> string_val | bool_val | float_val |
> +-----------------------------+-------+---------+----------+----------+-------------+-----------+------------+
> | planner.slice_target | LONG | SYSTEM | CHANGED | 10 | null
> | null | null |
> | planner.width.max_per_node | LONG | SYSTEM | CHANGED | 5 | null
> | null | null |
> +-----------------------------+-------+---------+----------+----------+-------------+-----------+------------+
> 2 rows selected (0.16 seconds)
> Reporter: jean-claude
>
> copy the parquet files in the samples directory so that you have a 12 or so
> $ ls -lha /apache-drill-1.4.0/sample-data/nationsMF/
> nationsMF1.parquet
> nationsMF2.parquet
> nationsMF3.parquet
> create a file with a few thousand lines like these
> select * from dfs.`/Users/jccote/apache-drill-1.4.0/sample-data/nationsMF`
> limit 500;
> start drill
> $ /apache-drill-1.4.0/bin/drill-embeded
> reduce the slice target size to force drill to use multiple fragment/threads
> jdbc:drill:zk=local> system set planner.slice_target=10;
> now run the list of queries from the file your created above
> jdbc:drill:zk=local> !run /Users/jccote/test-memory-leak-using-limit.sql
> the java heap space keeps going up until the old space is at 100% and
> eventually you get an OutOfMemoryException in drill
> $ jstat -gccause 86850 5s
> S0 S1 E O M CCS YGC YGCT FGC FGCT
> GCT LGCC GCC
> 0.00 0.00 100.00 100.00 98.56 96.71 2279 26.682 240 458.139
> 484.821 GCLocker Initiated GC Ergonomics
> 0.00 0.00 100.00 99.99 98.56 96.71 2279 26.682 242 461.347
> 488.028 Allocation Failure Ergonomics
> 0.00 0.00 100.00 99.99 98.56 96.71 2279 26.682 245 466.630
> 493.311 Allocation Failure Ergonomics
> 0.00 0.00 100.00 99.99 98.56 96.71 2279 26.682 247 470.020
> 496.702 Allocation Failure Ergonomics
> If you do the same test but do not use the LIMIT then the memory usage does
> not go up.
> If you add a where clause so that no results are returned, then the memory
> usage does not go up.
> Something with the RPC layer?
> Also it seems sensitive to the number of fragments/threads. If you limit it
> to one fragment/thread the memory usage goes up much slower.
> I have used parquet files and CSV files. In either case the behaviour is the
> same.
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