Chackaravarthy resolved HDFS-10365.
    Resolution: Not A Bug

Closing this jira as the issue was resolved after increasing 
{{dfs.blockreport.initialDelay}} value. Thanks for all the inputs.

> FullBlockReports retransmission delays NN startup time in large cluster.
> ------------------------------------------------------------------------
>                 Key: HDFS-10365
>                 URL: https://issues.apache.org/jira/browse/HDFS-10365
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs
>    Affects Versions: 2.6.0
>         Environment: version - hadoop-2.6.0 (hdp-2.2)
> DN - 1200 nodes
>            Reporter: Chackaravarthy
>            Priority: Critical
> Whenever NN is restarted, it takes huge time for NN to come back to stable 
> state. i.e. Last contact time remains more than 1 or 2 mins continuously for 
> around 3 to 4 hours. This is mainly because most of the DN's getting timeout 
> (60s) in blockReport (FBR) rpc call and then it keep sending FBR again.

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