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https://issues.apache.org/jira/browse/HDFS-3368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279039#comment-13279039
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Suresh Srinivas edited comment on HDFS-3368 at 5/18/12 6:15 PM:
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bq. Your question about complexity is similar to one of why do we bother
introducing all the HA complexity if all NameNodes primary and standby can fail
at once.
:-) I do not see the relationship of this to my comments.
I am not saying this problem should not be solved. Given how rare it is, why
change the default behavior. If others feel this makes sense, I am okay with
it. Note that the problem is solved only for some cases, that is excess replica
deletion and not during block allocation.
was (Author: sureshms):
bq. Your question about complexity is similar to one of why do we bother
introducing all the HA complexity if all NameNodes primary and standby can fail
at once.
:-) I do see the relationship of this to my comments.
I am not saying this problem should not be solved. Given how rare it is, why
change the default behavior. If others feel this makes sense, I am okay with
it. Note that the problem is solved only for some cases, that is excess replica
deletion and not during block allocation.
> 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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