Check for zero size block meta file when updating a block.
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Key: HADOOP-4778
URL: https://issues.apache.org/jira/browse/HADOOP-4778
Project: Hadoop Core
Issue Type: Bug
Components: dfs
Reporter: Tsz Wo (Nicholas), SZE
Assignee: Tsz Wo (Nicholas), SZE
Priority: Blocker
Fix For: 0.18.3
In case of datanode running out of disk space, block meta files may be created
with zero length. We should detect this obvious problem when updating a block.
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