NameNode.getBlockLocations throws NPE when offset > filesize and file is not
empty
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Key: HDFS-513
URL: https://issues.apache.org/jira/browse/HDFS-513
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Reporter: Todd Lipcon
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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