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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-3563) Shuffle data not always be cleaned
Date Thu, 26 Feb 2015 00:51:05 GMT

     [ https://issues.apache.org/jira/browse/SPARK-3563?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sean Owen resolved SPARK-3563.
------------------------------
    Resolution: Duplicate

This is either 'not a problem' (leaking references to RDDs) or is another issue asking 'why
does a shuffle file not get deleted?' which I'm hoping to direct to SPARK-5836. It's not quite
a duplicate but I believe the underlying issue is the same.

> Shuffle data not always be cleaned
> ----------------------------------
>
>                 Key: SPARK-3563
>                 URL: https://issues.apache.org/jira/browse/SPARK-3563
>             Project: Spark
>          Issue Type: Bug
>          Components: Streaming
>    Affects Versions: 1.0.2
>            Reporter: Hong Shen
>
> In our cluster, when we run a spark streaming job, after running for many hours, the
shuffle data seems not all be cleaned, here is the shuffle data:
> -rw-r----- 1 tdwadmin users 23948 Sep 17 13:21 shuffle_132_34_0
> -rw-r----- 1 tdwadmin users 18237 Sep 17 13:32 shuffle_143_22_1
> -rw-r----- 1 tdwadmin users 22934 Sep 17 13:35 shuffle_146_15_0
> -rw-r----- 1 tdwadmin users 27666 Sep 17 13:35 shuffle_146_36_1
> -rw-r----- 1 tdwadmin users 12864 Sep 17 14:05 shuffle_176_12_0
> -rw-r----- 1 tdwadmin users 22115 Sep 17 14:05 shuffle_176_33_1
> -rw-r----- 1 tdwadmin users 15666 Sep 17 14:21 shuffle_192_0_1
> -rw-r----- 1 tdwadmin users 13916 Sep 17 14:38 shuffle_209_53_0
> -rw-r----- 1 tdwadmin users 20031 Sep 17 14:41 shuffle_212_26_0
> -rw-r----- 1 tdwadmin users 15158 Sep 17 14:41 shuffle_212_47_1
> -rw-r----- 1 tdwadmin users 42880 Sep 17 12:12 shuffle_63_1_1
> -rw-r----- 1 tdwadmin users 32030 Sep 17 12:14 shuffle_65_40_0
> -rw-r----- 1 tdwadmin users 34477 Sep 17 12:33 shuffle_84_2_1
> The shuffle data of stage 63, 65, 84, 132... are not cleaned.
> In ContextCleaner, it maintains a weak reference for each RDD, ShuffleDependency, and
Broadcast of interest,  to be processed when the associated object goes out of scope of the
application. Actual  cleanup is performed in a separate daemon thread. 
> There must be some  reference for ShuffleDependency , and it's hard to find out.



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