Datanode should delete files under tmp when upgraded from 0.17
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Key: HADOOP-4663
URL: https://issues.apache.org/jira/browse/HADOOP-4663
Project: Hadoop Core
Issue Type: Bug
Affects Versions: 0.18.0
Reporter: Raghu Angadi
Assignee: dhruba borthakur
Priority: Blocker
Fix For: 0.18.3
Before 0.18, when Datanode restarts, it deletes files under data-dir/tmp
directory since these files are not valid anymore. But in 0.18 it moves these
files to normal directory incorrectly making them valid blocks. One of the
following would work :
- remove the tmp files during upgrade, or
- if the files under /tmp are in pre-18 format (i.e. no generation), delete
them.
Currently effect of this bug is that, these files end up failing block
verification and eventually get deleted. But cause incorrect over-replication
at the namenode before that.
Also it looks like our policy regd treating files under tmp needs to be defined
better. Right now there are probably one or two more bugs with it. Dhruba,
please file them if you rememeber.
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