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https://issues.apache.org/jira/browse/HDFS-6100?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-6100:
----------------------------
Resolution: Fixed
Fix Version/s: 2.4.0
Hadoop Flags: Reviewed
Status: Resolved (was: Patch Available)
I've committed the patch to trunk, branch-2, and branch-2.4. Thanks [~wheat9]
for the contribution.
> DataNodeWebHdfsMethods does not failover in HA mode
> ---------------------------------------------------
>
> Key: HDFS-6100
> URL: https://issues.apache.org/jira/browse/HDFS-6100
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha
> Affects Versions: 2.4.0
> Reporter: Arpit Gupta
> Assignee: Haohui Mai
> Fix For: 2.4.0
>
> Attachments: HDFS-6100.000.patch, HDFS-6100.001.patch
>
>
> In {{DataNodeWebHdfsMethods}}, the code creates a {{DFSClient}} to connect to
> the NN, so that it can access the files in the cluster.
> {{DataNodeWebHdfsMethods}} relies on the address passed in the URL to locate
> the NN. This implementation has two problems:
> # The {{DFSClient}} only knows about the current active NN, thus it does not
> support failover.
> # The delegation token is based on the active NN, therefore the {{DFSClient}}
> will fail to authenticate of the standby NN in secure HA setup.
> Currently the parameter {{namenoderpcaddress}} in the URL stores the host-ip
> pair that corresponds to the active NN. To fix this bug, this jira proposes
> to store the name service id in the parameter in HA setup (yet the parameter
> stays the same in non-HA setup).
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