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https://issues.apache.org/jira/browse/HDFS-9262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15042347#comment-15042347
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Arpit Agarwal commented on HDFS-9262:
-------------------------------------
Hi [~xiaobingo], we already have a cross-cast to Reconfigurable. Instead I
think a downcast to FsDatasetImpl will be easier to follow and we can remove
the unused functions from FsDatasetImpl.
Alternatively, FsDatasetSpi can extend {{Reconfigurable}} and DN delegates all
'unknown' properties to the dataset. Then we don't need any downcasts or
reflection. You can also avoid hard-coding
DFS_DATANODE_LAZY_WRITER_INTERVAL_SEC in DataNode#RECONFIGURABLE_PROPERTIES,
querying the list from the dataset and appending it to
#RECONFIGURABLE_PROPERTIES. This is better long term but I am fine with either.
> Reconfigure DN lazy writer interval on the fly
> ----------------------------------------------
>
> Key: HDFS-9262
> URL: https://issues.apache.org/jira/browse/HDFS-9262
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Affects Versions: 2.7.0
> Reporter: Xiaobing Zhou
> Assignee: Xiaobing Zhou
> Attachments: HDFS-9262.001.patch
>
>
> This is to reconfigure
> {code}
> dfs.datanode.lazywriter.interval.sec
> {code}
> without restarting DN.
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