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https://issues.apache.org/jira/browse/HDFS-6848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14096431#comment-14096431
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Ted Yu commented on HDFS-6848:
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bq. it is better to call the synchronized method setDatanodeUuid() 
That should be good.

> Lack of synchronization on access to datanodeUuid in DataStorage#format() 
> --------------------------------------------------------------------------
>
>                 Key: HDFS-6848
>                 URL: https://issues.apache.org/jira/browse/HDFS-6848
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Ted Yu
>            Priority: Minor
>
> {code}
>     this.datanodeUuid = datanodeUuid;
> {code}
> The above assignment should be done holding lock "DataStorage.this" - as is 
> done in two other places.



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