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https://issues.apache.org/jira/browse/HDFS-3368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279263#comment-13279263
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Tsz Wo (Nicholas), SZE commented on HDFS-3368:
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If a datanode somehow has a long heartbeat interval, it does indicate that the
datanode may have some problem. Also, the patch is quite simple. So, I am
fine on changing the default replication policy. Some comments on the patch:
- How about renaming DFS_TOLERATE_HEARTBEAT_MISSES to
DFS_TOLERATE_HEARTBEAT_MULTIPLIER?
- Since we are not sure what is a good choice of the multiplier, how about
making it configurable?
> 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-0.22.patch,
> blockDeletePolicy-trunk.patch, 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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