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https://issues.apache.org/jira/browse/HDFS-3275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13260815#comment-13260815
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Uma Maheswara Rao G commented on HDFS-3275:
-------------------------------------------
Reason is, two time you are taking the element in one iteration.
{code}
+ URI dirUri = *it.next()*;
+ if (!dirUri.getScheme().equals(NNStorage.LOCAL_URI_SCHEME)) {
+ System.err.println("Skipping format for directory \"" + dirUri
+ + "\". Can only format local directories with scheme \""
+ + NNStorage.LOCAL_URI_SCHEME + "\".");
+ continue;
+ }
+ // To validate only file based schemes are formatted
+ assert dirUri.getScheme().equals(NNStorage.LOCAL_URI_SCHEME) :
+ "formatting is not supported for " + dirUri;
+
File curDir = new File(*it.next()*.getPath());
{code}
> Format command overwrites contents of non-empty shared edits dir if name dirs
> are empty without any prompting
> -------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-3275
> URL: https://issues.apache.org/jira/browse/HDFS-3275
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha, name-node
> Affects Versions: 2.0.0
> Reporter: Vinithra Varadharajan
> Assignee: amith
> Fix For: 3.0.0
>
> Attachments: HDFS-3275.patch, HDFS-3275_1.patch, HDFS-3275_1.patch,
> HDFS-3275_2.patch, HDFS-3275_2.patch, HDFS-3275_3.patch
>
>
> To reproduce:
> # Configure a NameNode with namedirs and a shared edits dir, all of which are
> empty.
> # Run hdfs namenode -format. Namedirs and shared edits dir gets populated.
> # Delete the contents of the namedirs. Leave the shared edits dir as is.
> Check the timestamps of the shared edits dir contents.
> # Run format again. The namedirs as well as the shared edits dir get
> formatted. The shared edits dir's contents have been replaced without any
> prompting.
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