[ https://issues.apache.org/jira/browse/HDFS-1850?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eli Collins updated HDFS-1850:
------------------------------
Attachment: hdfs-1850-2.patch
Updated patch attached. Breaks out the testing of DFS_DATANODE_FAILED_VOLUMES_TOLERATED to
a new test so it's easier to add new tests of this functionality.
> 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, 0.23.0
>
> Attachments: hdfs-1850-1.patch, hdfs-1850-2.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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