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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1541) Not marking datanodes dead When namenode in safemode
Date Thu, 16 Dec 2010 04:31:01 GMT
Not marking datanodes dead When namenode in safemode
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                 Key: HDFS-1541
                 URL: https://issues.apache.org/jira/browse/HDFS-1541
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
    Affects Versions: 0.23.0
            Reporter: Hairong Kuang
            Assignee: Hairong Kuang
             Fix For: 0.23.0


In a big cluster, when namenode starts up,  it takes a long time for namenode to process block
reports from all datanodes. Because heartbeats processing get delayed, some datanodes are
erroneously marked as dead, then later on they have to register again, thus wasting time.

It would speed up starting time if the checking of dead nodes is disabled when namenode in
safemode.

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