[jira] [Work started] (HDFS-16062) When a DataNode hot reload configuration, JMX will block for a long time

["JiangHua Zhu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-16062?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HDFS-16062 started by JiangHua Zhu.
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> When a DataNode hot reload configuration, JMX will block for a long time
> ------------------------------------------------------------------------
>
>                 Key: HDFS-16062
>                 URL: https://issues.apache.org/jira/browse/HDFS-16062
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: JiangHua Zhu
>            Assignee: JiangHua Zhu
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> When executing the reconfig command on the DataNode, for example:
> hdfs dfsadmin -reconfig datanode hadoopxxxx.jd.163.org:8025 start
> At this time, the JMX of the DataNode is requested. At this time, JMX will still block after a long time.
> When this happens, it is mainly caused by some disk exceptions (such as disk unavailability) on the DataNode. At this time, DataNode#JMX will block.



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