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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2804) SBN should not mark blocks under-replicated when exiting safemode
Date Tue, 17 Jan 2012 19:29:44 GMT
SBN should not mark blocks under-replicated when exiting safemode
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                 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


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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