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https://issues.apache.org/jira/browse/HDFS-1250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12880342#action_12880342
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Suresh Srinivas commented on HDFS-1250:
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This creates several problems:
# Blocks from dead datanode is added to block map. Opening a file returns
blocks from the dead datanode. The client experience failure to read it
repeatedly.
# Decommissioning the datanode does not resolve this problem as the blocks
continue to remain in the block map. Only way to solve this problem is by
restarting namenode.
This problem was observed on a yahoo cluster, where a datanode was marked dead,
however a block report from it made it to namenode.
> 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
>
> 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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