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https://issues.apache.org/jira/browse/HDFS-16062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17399438#comment-17399438
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JiangHua Zhu commented on HDFS-16062:
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We have a 2000 node cluster, using this patch, it runs very well.
> 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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