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From "Todd Lipcon (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-2804) SBN should not mark blocks under-replicated when exiting safemode
Date Mon, 23 Jan 2012 22:23:49 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Todd Lipcon resolved HDFS-2804.

       Resolution: Fixed
    Fix Version/s: HA branch (HDFS-1623)
     Hadoop Flags: Reviewed

I ran the HA tests with this patch applied and they all passed. Committed to branch, thanks
> SBN should not mark blocks under-replicated when exiting safemode
> -----------------------------------------------------------------
>                 Key: HDFS-2804
>                 URL: https://issues.apache.org/jira/browse/HDFS-2804
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: HA branch (HDFS-1623)
>         Attachments: hdfs-2804.txt, hdfs-2804.txt
> In testing on a cluster, I restarted with one fewer datanodes than previously. This caused
a few thousand blocks to be under-replicated. Similar to HDFS-2795, I saw the under-replicated
blocks on the SBN, slowly decreasing as the replication thread ran. This seems to be because
we process the replication queue when exiting safemode, even if in standby mode. It also reports
many "missing blocks" in the NN UI which are slowly decreasing.

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