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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 Thu, 04 May 2017 20:08:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15997361#comment-15997361
] 

Arpit Agarwal commented on HDFS-11448:
--------------------------------------

+1 from me for the v03 patch.

[~jingzhao], do you have any additional comments? I will hold off committing. Thanks!

> 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-11448.002.patch, HDFS-11448.003.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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