Datanode corruption
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Key: NUTCH-106
URL: http://issues.apache.org/jira/browse/NUTCH-106
Project: Nutch
Type: Bug
Versions: 0.8-dev
Reporter: Rod Taylor
Priority: Critical
Our admins accidentally started a second nutch datanode pointing to the same
directories as one already running (same machine) which in turn caused the
entire contents of the datanode to go disappear.
This happened because the blocking was based on the username (since fixed in
our start scripts) and it was started as two different users.
The ndfs.name.dir and ndfs.data.dir directories were both completely devoid of
content, where they had about 150GB not all that much earlier.
I think the solution is improved interlocking within the data directory itself
(file locked with flock or something similar).
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