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https://issues.apache.org/jira/browse/HDFS-3368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268904#comment-13268904
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Todd Lipcon commented on HDFS-3368:
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bq. Todd, if you want to double "minus heartbeat interval", please get some
motivation for that. I mean why not triple or 1.5 x.
Sure, either of those seem fine too. Just meant to express that using the
heartbeat interval itself may not be right, since the actual receipt of the
heart beats may jitter a bit around the configured value (eg if a DN has to
make a block report, or otherwise gets held up by a couple seconds).
> 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
> Attachments: blockDeletePolicy.patch
>
>
> 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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