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https://issues.apache.org/jira/browse/HADOOP-4735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12651186#action_12651186
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Christian Kunz commented on HADOOP-4735:
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They were created 11/16 (I found the corresponding log messages on the
Namenode, no other log messages referring to these blocks) and used as
non-empty files by subsequent jobs (non-empty otherwise they would have failed
as mentioned in the description). They must have been become empty within the
last few days.
I checked one of the blocks on one of the datanodes after namenode restart.
Still there and still non-empty.
I will now move the empty files away into a different location (they will still
be available for examination) and re-create the original files from the
non-empty blocks.
> NameNode reporting 0 size for originally non-empty files
> --------------------------------------------------------
>
> Key: HADOOP-4735
> URL: https://issues.apache.org/jira/browse/HADOOP-4735
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.17.2
> Reporter: Christian Kunz
>
> NameNode reports 0 size for a handful of files that were non-empty originally.
> The corresponding blocks on the DataNodes are non-empty.
> NameNode must have reported correct size at some time, because applications
> that would have failed with 0 size files, executed successfully.
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