saveNamespace can corrupt edits log
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Key: HDFS-988
URL: https://issues.apache.org/jira/browse/HDFS-988
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Reporter: dhruba borthakur
The adminstrator puts the namenode is safemode and then issues the
savenamespace command. This can corrupt the edits log. The problem is that
when the NN enters safemode, there could still be pending logSycs occuring from
other threads. Now, the saveNamespace command, when executed, would save a
edits log with partial writes. I have seen this happen on 0.20.
https://issues.apache.org/jira/browse/HDFS-909?focusedCommentId=12828853&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12828853
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