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https://issues.apache.org/jira/browse/HDFS-513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jakob Homan reassigned HDFS-513:
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Assignee: Todd Lipcon
> NameNode.getBlockLocations throws NPE when offset > filesize and file is not
> empty
> ----------------------------------------------------------------------------------
>
> Key: HDFS-513
> URL: https://issues.apache.org/jira/browse/HDFS-513
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hdfs-513-trunk.txt, hdfs-513.txt
>
>
> in BlockManager.getBlockLocations, if the offset is past the end of a
> non-empty file, it returns null. In FSNamesystem.getBlockLocationsInternal,
> this null is passed through to inode.createLocatedBlocks, so it ends up with
> a LocatedBlocks instance whose .blocks is null. This is then iterated over in
> FSNamesystem.getBlockLocations, and throws an NPE.
> Instead, I think BlockManager.getBlockLocations should return
> Collections.emptyList in the past-EOF case. This would result in an empty
> list response from NN.getBlockLocations which matches the behavior of an
> empty file. If this sounds like the appropriate fix I"ll attach the patch.
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