Manual leaving of safe mode may lead to data lost
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Key: HADOOP-4935
URL: https://issues.apache.org/jira/browse/HADOOP-4935
Project: Hadoop Core
Issue Type: Bug
Components: dfs
Affects Versions: 0.18.3
Reporter: Hairong Kuang
Assignee: Konstantin Shvachko
Fix For: 0.18.3
Due to HADOOP-4610, NameNode calculates mis-replicated blocks when leaving safe
mode manually, where it clears the pending deletion queue before it does the
calculation. This works fine when NameNode just starts but introduced a bug
when NameNode is running for a while. Clearing the pending deletion queue makes
NameNode not able to distinguish valid replicas from invalid ones, ie, the ones
that have scheduled or dispatched for deletion. Therefore, NameNode may
mistakenly decide the block is over-replicated and choose all valid ones to
delete.
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