[jira] [Updated] (HDFS-2794) HA: Active NN may purge edit log files before standby NN has a chance to read them

["Todd Lipcon (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-2794?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon updated HDFS-2794:
------------------------------

    Attachment: hdfs-2794.txt
    
> 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
>
>
> 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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