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https://issues.apache.org/jira/browse/HADOOP-5099?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jakob Homan reassigned HADOOP-5099:
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Assignee: Jakob Homan
> DataNode should warn about unknown files in storage
> ---------------------------------------------------
>
> Key: HADOOP-5099
> URL: https://issues.apache.org/jira/browse/HADOOP-5099
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs
> Reporter: Raghu Angadi
> Assignee: Jakob Homan
>
> DataNode currently just ignores the files it does not know about. There could
> be a lot of files left in DataNode's storage that never get noticed or
> deleted. These files could be left because of bugs or by a misconfiguration.
> E.g. while upgrading from 0.17, DN left a lot of metada files that were not
> named in correct format for 0.18 (HADOOP-4663).
> The proposal here is simply to make DN print a warning for each of the
> unknown files at the start up. This at least gives a way to list all the
> unknown files and (equally importantly) forces a notion of "known" and
> "unknown" files in the storage.
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