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From "Hanisha Koneru (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11448) JN log segment syncing should support HA upgrade
Date Fri, 21 Apr 2017 00:24:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11448?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Hanisha Koneru updated HDFS-11448:
    Attachment: HDFS-11448.001.patch

Patch v01 adds support for JN sync during upgrade/ rollback.
Instead of downloading the log segments to _current_ directory, we download them to a temporary
directory (_current.tmp_). Once the download is complete, we atomically move the log segment
to current directory. 

> 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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