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Date: Tue, 14 Jun 2016 15:52:01 +0000 (UTC)
From: "Kihwal Lee (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12978441.1465852398000.3025.1465919521318@Atlassian.JIRA>
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Subject: [jira] [Commented] (HDFS-10519) Add a configuration option to
 enable in-progress edit log tailing
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archived-at: Tue, 14 Jun 2016 15:52:03 -0000


    [ https://issues.apache.org/jira/browse/HDFS-10519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15329706#comment-15329706 ] 

Kihwal Lee commented on HDFS-10519:
-----------------------------------

How does it actually work? Can it replay the same edit log segment multiple times? It might have to replay the same in-progress segment multiple times or after it is finalized.
I thought it would blow up with {{MetaRecoveryContext}} being null.

> Add a configuration option to enable in-progress edit log tailing
> -----------------------------------------------------------------
>
>                 Key: HDFS-10519
>                 URL: https://issues.apache.org/jira/browse/HDFS-10519
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ha
>            Reporter: Jiayi Zhou
>            Assignee: Jiayi Zhou
>            Priority: Minor
>         Attachments: HDFS-10519.001.patch, HDFS-10519.002.patch
>
>
> Standby Namenode has the option to do in-progress edit log tailing to improve the data freshness. In-progress tailing is already implemented, but it's not enabled as default configuration. And there's no related configuration key to turn it on.
> Adding a related configuration key to let Standby Namenode is reasonable and would be a basis for further improvement on Standby Namenode.


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