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From "Eli Collins (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2804) SBN should not mark blocks under-replicated when exiting safemode
Date Mon, 23 Jan 2012 22:17:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191539#comment-13191539

Eli Collins commented on HDFS-2804:

Still looks good =)
> 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
>         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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