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https://issues.apache.org/jira/browse/HDFS-3368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268615#comment-13268615
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Todd Lipcon commented on HDFS-3368:
-----------------------------------
bq. first look at the oldest heartbeat time, and second at the free space, when
all heartbeats are within the heartbeat interval
Seems we need some kind of slop factor on the heartbeat interval, right? eg if
a DN is within 2x the heartbeat interval then it's considered "probably alive"
for this policy.
> Missing blocks due to bad DataNodes comming up and down.
> --------------------------------------------------------
>
> Key: HDFS-3368
> URL: https://issues.apache.org/jira/browse/HDFS-3368
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.22.0, 1.0.0, 2.0.0, 3.0.0
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
>
> All replicas of a block can be removed if bad DataNodes come up and down
> during cluster restart resulting in data loss.
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