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https://issues.apache.org/jira/browse/HDFS-11112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16541368#comment-16541368
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Vinayakumar B commented on HDFS-11112:
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Should this have been marked incompatible?
I agree that this will avoid accidental deletes.
But still it should be able to format on demand. i.e. When the answer to prompt
is 'yes' during reformat. Similar to Namenode dir format.
> Journal Nodes should refuse to format non-empty directories
> -----------------------------------------------------------
>
> Key: HDFS-11112
> URL: https://issues.apache.org/jira/browse/HDFS-11112
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Arpit Agarwal
> Assignee: Yiqun Lin
> Priority: Major
> Fix For: 2.9.0, 3.0.0-alpha4
>
> Attachments: HDFS-11112.001.patch, HDFS-11112.002.patch
>
>
> Journal Nodes should reject the {{format}} RPC request if a storage directory
> is non-empty. The relevant code is in {{JNStorage#format}}.
> {code}
> void format(NamespaceInfo nsInfo) throws IOException {
> setStorageInfo(nsInfo);
> ...
> unlockAll();
> sd.clearDirectory();
> writeProperties(sd);
> createPaxosDir();
> analyzeStorage();
> {code}
> This would make the behavior similar to {{namenode -format -nonInteractive}}.
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