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Date: Mon, 5 Sep 2011 17:48:10 +0000 (UTC)
From: "Harsh J (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-2311) With just 1 block on the HDFS cluster,
 NN exits safemode on startup immediately.
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With just 1 block on the HDFS cluster, NN exits safemode on startup immediately.
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                 Key: HDFS-2311
                 URL: https://issues.apache.org/jira/browse/HDFS-2311
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
    Affects Versions: 0.20.203.0
            Reporter: Harsh J
            Priority: Minor


This is cause:

(int) ((1 Block) * (0.999f Threshold Default Pct)) == 0, in which case SafeModeInfo's checks of modes makes an simple, direct exit of the safemode.

Faulty code is possibly in FSNamesystem#setBlockTotal. This is a non major issue since with 2 blocks it would work fine, and will work fine with 1.0f Threshold Pct too.

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