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https://issues.apache.org/jira/browse/HADOOP-1846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12526560
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Hairong Kuang commented on HADOOP-1846:
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> This patch introduces a new conf variable called heartbeat.recheck.interval.
This conf variable is to make TestDatanodeReport to run quicker. A datanode
won't be declared dead after a name node has not received its heartbeat for
2*heartbeat.recheck.interval+10*heartbeat interval. The heartbeat recheck
interval was set to be 5 minutes. In the test, I set it to be 0.5s. This config
variable is not intended for admin usage so it is not in hadoop-default.xml.
> DatanodeReport should distinguish live datanodes from dead datanodes
> --------------------------------------------------------------------
>
> Key: HADOOP-1846
> URL: https://issues.apache.org/jira/browse/HADOOP-1846
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.14.1
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Fix For: 0.15.0
>
> Attachments: datanodeReport.patch
>
>
> DatanodeReport returns both live and dead datanodes and there is no way to
> distinguish live nodes from dead nodes. But some applications are interested
> in only live datanodes. I propose that instead of haveing one
> datanodeReport, dfs supports two reports: liveDatanodeReport and
> deadDatanodeReport.
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