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https://issues.apache.org/jira/browse/HDFS-11112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15648748#comment-15648748
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Arpit Agarwal commented on HDFS-11112:
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Thank you for taking this up [~linyiqun]. Couple of nitpicks with the patch:
# This comment can be removed. Since we call unlockAll() and analyzeStorage(),
it follows that we expect the storage can be non-empty and locked.
{code}
// Unlock the directory since the storage maybe not empty and
// locked before formatting sometimes.
{code}
# We should wrap the _sd.analyzeStorage(StartupOption.FORMAT, this, true);_
call in try-finally and release the lock in the finally block, so we don't
return with the lock held if analyze failed.
This change may be incompatible as there is a good chance of breaking someone's
test setup. I'd commit it to trunk only, just to be safe.
> 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
> Attachments: HDFS-11112.001.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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