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https://issues.apache.org/jira/browse/HDFS-1508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12969975#action_12969975
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Sanjay Radia commented on HDFS-1508:
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Does the following table representative the design?
|| ||Previously AbortedCheckpoint||SaveNamespace || Checkpoint||
|Previously AbortedCheckpoint | x | Continue SaveNamespace | Continue
Checkpoint|
|SaveNamespace |Continue SaveNamespace |x | Continue SaveNamespace but Abort
Checkpoint|
|Checkpoint | Continue Checkpoint |Continue SaveNamespace but Abort Checkpoint
|x |
In which of the above cases will you enter safemode?
> Ability to do savenamespace without being in safemode
> -----------------------------------------------------
>
> Key: HDFS-1508
> URL: https://issues.apache.org/jira/browse/HDFS-1508
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Attachments: savenamespaceWithoutSafemode.txt,
> savenamespaceWithoutSafemode2.txt, savenamespaceWithoutSafemode3.txt,
> savenamespaceWithoutSafemode4.txt
>
>
> In the current code, the administrator can run savenamespace only after
> putting the namenode in safemode. This means that applications that are
> writing to HDFS encounters errors because the NN is in safemode. We would
> like to allow saveNamespace even when the namenode is not in safemode.
> The savenamespace command already acquires the FSNamesystem writelock. There
> is no need to require that the namenode is in safemode too.
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