Image corrupt with number of files = 1
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Key: HDFS-1029
URL: https://issues.apache.org/jira/browse/HDFS-1029
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.20.1
Reporter: Todd Lipcon
Last week I recovered a corrupt namenode image that was completely sane except
that the "number of files" in the header was set to 1, rather than the correct
number (many million). The NN in question had been running for some time, so I
believe the 2NN uploaded this broken image as a checkpoint. After this point,
of course, no further checkpoints occurred, and the NN failed to load its image
upon restart.
Not sure how this happens - my only thought is that we may need to add
synchronization on the nsCount field in INodeDirectoryWithQuota, but that's a
long shot.
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