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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11448) JN log segment syncing should support HA upgrade
Date Wed, 03 May 2017 16:42:04 GMT

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

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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