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From "Chackaravarthy (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10365) FullBlockReports retransmission delays NN startup time in large cluster.
Date Wed, 04 May 2016 18:41:12 GMT
Chackaravarthy created HDFS-10365:
-------------------------------------

             Summary: 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
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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