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From "Ian Babrou (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-4796) Spark does not remove temp files
Date Tue, 09 Dec 2014 13:23:12 GMT

    [ https://issues.apache.org/jira/browse/SPARK-4796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14239383#comment-14239383
] 

Ian Babrou commented on SPARK-4796:
-----------------------------------

How can they be reevaluated if job is finished? Do you have a link to docs where this behavior
is explained?

I have zero running jobs and zero spark processes, I assume that there should be exactly zero
"temporary" files. Is it a wrong assumption?

> Spark does not remove temp files
> --------------------------------
>
>                 Key: SPARK-4796
>                 URL: https://issues.apache.org/jira/browse/SPARK-4796
>             Project: Spark
>          Issue Type: Bug
>          Components: Input/Output
>    Affects Versions: 1.1.0
>         Environment: I'm runnin spark on mesos and mesos slaves are docker containers.
Spark 1.1.0, elasticsearch spark 2.1.0-Beta3, mesos 0.20.0, docker 1.2.0.
>            Reporter: Ian Babrou
>
> I started a job that cannot fill into memory and got "no space left on device". That
was fair, because docker containers only have 10gb of disk space and some is taken by OS already.
> But then I found out when job failed it didn't release any disk space and left container
without any free disk space.
> Then I decided to check if spark removes temp files in any case, because many mesos slaves
had /tmp/spark-local-*. Apparently some garbage stays after spark task is finished. I attached
with strace to running job:
> [pid 30212] unlink("/tmp/spark-local-20141209091330-48b5/12/temp_8a73fcc2-4baa-499a-8add-0161f918de8a")
= 0
> [pid 30212] unlink("/tmp/spark-local-20141209091330-48b5/31/temp_47efd04b-d427-4139-8f48-3d5d421e9be4")
= 0
> [pid 30212] unlink("/tmp/spark-local-20141209091330-48b5/15/temp_619a46dc-40de-43f1-a844-4db146a607c6")
= 0
> [pid 30212] unlink("/tmp/spark-local-20141209091330-48b5/05/temp_d97d90a7-8bc1-4742-ba9b-41d74ea73c36"
<unfinished ...>
> [pid 30212] <... unlink resumed> )      = 0
> [pid 30212] unlink("/tmp/spark-local-20141209091330-48b5/36/temp_a2deb806-714a-457a-90c8-5d9f3247a5d7")
= 0
> [pid 30212] unlink("/tmp/spark-local-20141209091330-48b5/04/temp_afd558f1-2fd0-48d7-bc65-07b5f4455b22")
= 0
> [pid 30212] unlink("/tmp/spark-local-20141209091330-48b5/32/temp_a7add910-8dc3-482c-baf5-09d5a187c62a"
<unfinished ...>
> [pid 30212] <... unlink resumed> )      = 0
> [pid 30212] unlink("/tmp/spark-local-20141209091330-48b5/21/temp_485612f0-527f-47b0-bb8b-6016f3b9ec19")
= 0
> [pid 30212] unlink("/tmp/spark-local-20141209091330-48b5/12/temp_bb2b4e06-a9dd-408e-8395-f6c5f4e2d52f")
= 0
> [pid 30212] unlink("/tmp/spark-local-20141209091330-48b5/1e/temp_825293c6-9d3b-4451-9cb8-91e2abe5a19d"
<unfinished ...>
> [pid 30212] <... unlink resumed> )      = 0
> [pid 30212] unlink("/tmp/spark-local-20141209091330-48b5/15/temp_43fbb94c-9163-4aa7-ab83-e7693b9f21fc")
= 0
> [pid 30212] unlink("/tmp/spark-local-20141209091330-48b5/3d/temp_37f3629c-1b09-4907-b599-61b7df94b898"
<unfinished ...>
> [pid 30212] <... unlink resumed> )      = 0
> [pid 30212] unlink("/tmp/spark-local-20141209091330-48b5/35/temp_d18f49f6-1fb1-4c01-a694-0ee0a72294c0")
= 0
> And after job is finished, some files are still there:
> /tmp/spark-local-20141209091330-48b5/
> /tmp/spark-local-20141209091330-48b5/11
> /tmp/spark-local-20141209091330-48b5/11/shuffle_0_1_4
> /tmp/spark-local-20141209091330-48b5/32
> /tmp/spark-local-20141209091330-48b5/04
> /tmp/spark-local-20141209091330-48b5/05
> /tmp/spark-local-20141209091330-48b5/0f
> /tmp/spark-local-20141209091330-48b5/0f/shuffle_0_1_2
> /tmp/spark-local-20141209091330-48b5/3d
> /tmp/spark-local-20141209091330-48b5/0e
> /tmp/spark-local-20141209091330-48b5/0e/shuffle_0_1_1
> /tmp/spark-local-20141209091330-48b5/15
> /tmp/spark-local-20141209091330-48b5/0d
> /tmp/spark-local-20141209091330-48b5/0d/shuffle_0_1_0
> /tmp/spark-local-20141209091330-48b5/36
> /tmp/spark-local-20141209091330-48b5/31
> /tmp/spark-local-20141209091330-48b5/12
> /tmp/spark-local-20141209091330-48b5/21
> /tmp/spark-local-20141209091330-48b5/10
> /tmp/spark-local-20141209091330-48b5/10/shuffle_0_1_3
> /tmp/spark-local-20141209091330-48b5/1e
> /tmp/spark-local-20141209091330-48b5/35
> If I look into my mesos slaves, there are mostly "shuffle" files, overall picture for
single node:
> root@web338:~# find /tmp/spark-local-20141* -type f | fgrep shuffle | wc -l
> 781
> root@web338:~# find /tmp/spark-local-20141* -type f | fgrep -v shuffle | wc -l
> 10
> root@web338:~# find /tmp/spark-local-20141* -type f | fgrep -v shuffle
> /tmp/spark-local-20141119144512-67c4/2d/temp_9056f380-3edb-48d6-a7df-d4896f1e1cc3
> /tmp/spark-local-20141119144512-67c4/3d/temp_e005659b-eddf-4a34-947f-4f63fcddf111
> /tmp/spark-local-20141119144512-67c4/16/temp_71eba702-36b4-4e1a-aebc-20d2080f1705
> /tmp/spark-local-20141119144512-67c4/0d/temp_8037b9db-2d8a-4786-a554-a8cad922bf5e
> /tmp/spark-local-20141119144512-67c4/24/temp_f0e4cc43-6cc9-42a7-882d-f8a031fa4dc3
> /tmp/spark-local-20141119144512-67c4/29/temp_a8bbe2cb-f590-4b71-8ef8-9c0324beddc7
> /tmp/spark-local-20141119144512-67c4/3a/temp_9fc08519-f23a-40ac-a3fd-e58df6871460
> /tmp/spark-local-20141119144512-67c4/1e/temp_d66668ab-2999-48af-a136-84cfd6f5f6cb
> /tmp/spark-local-20141205110922-f78e/0a/temp_7409add5-e6ff-46e5-ae3f-6a4c7b2ddf8f
> /tmp/spark-local-20141205111026-0b53/01/temp_72024c94-7512-4692-8bd1-ef2417143d8c
> Conclusions:
> 1. Shuffle files should be removed, but they stay. 
> 2. Temp files should always be removed, but they stay.
> Maybe we should unlink temp and shuffle files immediately after creation to remove them
even if spark fails.



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