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https://issues.apache.org/jira/browse/HDFS-11448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15995188#comment-15995188
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Arpit Agarwal commented on HDFS-11448:
--------------------------------------

Thanks for this improvement [~hanishakoneru]. 
# The tmp directory can be created when the JournalNodeSyncer first starts up.
# Add javadocs to function {{getTemporaryCurrentDir}} to explain what 
current.tmp means.

Looks fine to me otherwise. [~jingzhao], do you have any comments on this 
change?

> JN log segment syncing should support HA upgrade
> ------------------------------------------------
>
>                 Key: HDFS-11448
>                 URL: https://issues.apache.org/jira/browse/HDFS-11448
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs
>            Reporter: Hanisha Koneru
>            Assignee: Hanisha Koneru
>         Attachments: HDFS-11448.001.patch
>
>
> HDFS-4025 adds support for sychronizing past log segments to JNs that missed 
> them. But, as pointed out by [~jingzhao], if the segment download happens 
> when an admin tries to rollback, it might fail ([see 
> comment|https://issues.apache.org/jira/browse/HDFS-4025?focusedCommentId=15850633&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15850633]).



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