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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1250) Namenode accepts block report from dead datanodes
Date Fri, 25 Jun 2010 22:51:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12882747#action_12882747
] 

Konstantin Shvachko commented on HDFS-1250:
-------------------------------------------

# Some more candidates, could you please verify and add isAlive() condition if necessary:
#- commitBlockSynchronization()
#- updatePipeline()
# You used "dead or unknown" twice and "unknown or dead" in one other place. Would be better
to have it consistent.

> Namenode accepts block report from dead datanodes
> -------------------------------------------------
>
>                 Key: HDFS-1250
>                 URL: https://issues.apache.org/jira/browse/HDFS-1250
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.20.2, 0.22.0
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>         Attachments: HDFS-1250.patch
>
>
> When a datanode heartbeat times out namenode marks it dead. The subsequent heartbeat
from the datanode is rejected with a command to datanode to re-register. However namenode
accepts block report from the datanode although it is marked dead.

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