[jira] [Resolved] (FLINK-2004) Memory leak in presence of failed checkpoints in KafkaSource

["Stephan Ewen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-2004?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephan Ewen resolved FLINK-2004.
---------------------------------
    Resolution: Fixed

Fixed via 7d294735eb3a77debbe2215c44dea4f97bcf7165

> Memory leak in presence of failed checkpoints in KafkaSource
> ------------------------------------------------------------
>
>                 Key: FLINK-2004
>                 URL: https://issues.apache.org/jira/browse/FLINK-2004
>             Project: Flink
>          Issue Type: Bug
>          Components: Streaming
>    Affects Versions: 0.9
>            Reporter: Stephan Ewen
>            Assignee: Robert Metzger
>            Priority: Critical
>             Fix For: 0.9
>
>
> Checkpoints that fail never send a commit message to the tasks.
> Maintaining a map of all pending checkpoints introduces a memory leak, as entries for failed checkpoints will never be removed.
> Approaches to fix this:
>   - The source cleans up entries from older checkpoints once a checkpoint is committed (simple implementation in a linked hash map)
>   - The commit message could include the optional state handle (source needs not maintain the map)
>   - The checkpoint coordinator could send messages for failed checkpoints?



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