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https://issues.apache.org/jira/browse/HDFS-16863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17655400#comment-17655400
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JiangHua Zhu commented on HDFS-16863:
-------------------------------------

[~yuyanlei], if FBR is reduced, will it have any new impact:
1. Some duplicates exist on Datanodes. NameNode should be notified but is not 
notified in time.
2. Complete the copy data saved by NameNode.

> Optimize frequency of regular block reports
> -------------------------------------------
>
>                 Key: HDFS-16863
>                 URL: https://issues.apache.org/jira/browse/HDFS-16863
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Yanlei Yu
>            Priority: Major
>         Attachments: HDFS-16863.patch
>
>
> like  HDFS-15162
> Avoid sending block report at regular interval, if there is no failover, 
> DiskError or any exception encountered in connecting to the Namenode.



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