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https://issues.apache.org/jira/browse/HDFS-6808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14138267#comment-14138267
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Colin Patrick McCabe commented on HDFS-6808:
--------------------------------------------
Hi Eddy. To summarize our offline discussion, we want this to be an async API.
The protobuf APIs should be something like:
{code}
ReloadDatanodeConfigGetStatusRequestProto { ... }
ReloadDatanodeConfigGetStatusResponseProto { long startTime, string status }
StartDatanodeReconfigRequestProto { ... }
StartDatanodeReconfigResponseProto { ... }
{code}
With corresponding command line arguments
{code}
startReconfiguration
listReconfiguration
{code}
This will make things a lot easier since we'll no longer have to worry about
the RPC timing out during reconfiguration. Make sure that we check if there is
a current reconfiguration before starting a new one (only one can be active at
once).
> Add command line option to ask DataNode reload configuration.
> -------------------------------------------------------------
>
> Key: HDFS-6808
> URL: https://issues.apache.org/jira/browse/HDFS-6808
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Affects Versions: 2.5.0
> Reporter: Lei (Eddy) Xu
> Assignee: Lei (Eddy) Xu
> Attachments: HDFS-6808.000.combo.patch, HDFS-6808.000.patch,
> HDFS-6808.001.combo.patch, HDFS-6808.001.patch, HDFS-6808.002.combo.patch,
> HDFS-6808.002.patch, HDFS-6808.003.combo.txt, HDFS-6808.003.patch,
> HDFS-6808.004.combo.patch, HDFS-6808.004.patch, HDFS-6808.005.combo.patch,
> HDFS-6808.005.patch
>
>
> The workflow of dynamically changing data volumes on DataNode is
> # Users manually changed {{dfs.datanode.data.dir}} in the configuration file
> # User use command line to notify DN to reload configuration and updates its
> volumes.
> This work adds command line support to notify DN to reload configuration.
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