[ https://issues.apache.org/jira/browse/HDFS-4461?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin Patrick McCabe updated HDFS-4461:
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Status: Patch Available (was: Open)
> DirectoryScanner: volume path prefix takes up memory for every block that is scanned
> -------------------------------------------------------------------------------------
>
> Key: HDFS-4461
> URL: https://issues.apache.org/jira/browse/HDFS-4461
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.0.3-alpha
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Priority: Minor
> Attachments: 002.patch
>
>
> In the {{DirectoryScanner}}, we create a class {{ScanInfo}} for every block. This object
contains two File objects-- one for the metadata file, and one for the block file. Since
those File objects contain full paths, users who pick a lengthly path for their volume roots
will end up using an extra N_blocks * path_prefix bytes per block scanned. We also don't
really need to store File objects-- storing strings and then creating File objects as needed
would be cheaper. This has been causing out-of-memory conditions for users who pick such
long volume paths.
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