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From "Chackaravarthy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10365) FullBlockReports retransmission delays NN startup time in large cluster.
Date Wed, 04 May 2016 20:12:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15271353#comment-15271353
] 

Chackaravarthy commented on HDFS-10365:
---------------------------------------

Thanks [~arpitagarwal]

> 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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