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