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https://issues.apache.org/jira/browse/HDFS-2794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201938#comment-13201938
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Hari Mankude commented on HDFS-2794:
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Decommisioning SBN might not be as simple as turning off the power to SBN in HA
mode. For example, if the user wanted to revert back to non-HA, there should be
a way for a provision for that.
But, ok with the changes. No issues from my side, +1
> HA: Active NN may purge edit log files before standby NN has a chance to read
> them
> ----------------------------------------------------------------------------------
>
> Key: HDFS-2794
> URL: https://issues.apache.org/jira/browse/HDFS-2794
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha, name-node
> Affects Versions: HA branch (HDFS-1623)
> Reporter: Aaron T. Myers
> Assignee: Todd Lipcon
> Attachments: hdfs-2794.txt, hdfs-2794.txt
>
>
> Given that the active NN is solely responsible for purging finalized edit log
> segments, and given that the active NN has no way of knowing when the standby
> reads edit logs, it's possible that the standby NN could fail to read all
> edits it needs before the active purges the files.
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