[jira] Commented: (HDFS-988) saveNamespace can corrupt edits log

["Brian Bockelman (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12835402#action_12835402 ] 

Brian Bockelman commented on HDFS-988:
--------------------------------------

How long can logSyncs be pending for?  Is this corruption still possible if the sysadmin waits, say, 5 minutes?

> saveNamespace can corrupt edits log
> -----------------------------------
>
>                 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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