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https://issues.apache.org/jira/browse/HDFS-1850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13027810#comment-13027810
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Todd Lipcon commented on HDFS-1850:
-----------------------------------
hdfs-1850-5.patch seems to have some conflict markers stuck in it (line 206 of
the patch)
> DN should transmit absolute failed volume count rather than increments to the
> NN
> --------------------------------------------------------------------------------
>
> Key: HDFS-1850
> URL: https://issues.apache.org/jira/browse/HDFS-1850
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node, name-node
> Reporter: Eli Collins
> Assignee: Eli Collins
> Fix For: 0.22.0
>
> Attachments: hdfs-1850-1.patch, hdfs-1850-2.patch, hdfs-1850-3.patch,
> hdfs-1850-4.patch, hdfs-1850-5.patch
>
>
> The API added in HDFS-811 for the DN to report volume failures to the NN is
> "inc(DN)". However the given sequence of events will result in the NN
> forgetting about reported failed volumes:
> # DN loses a volume and reports it
> # NN restarts
> # DN re-registers to the new NN
> A more robust interface would be to have the DN report the total number of
> volume failures to the NN each heart beat (the same way other volume state is
> transmitted).
> This will likely be an incompatible change since it requires changing the
> Datanode protocol.
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