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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6764) DN heartbeats may become clumped together
Date Mon, 28 Jul 2014 15:39:40 GMT
Daryn Sharp created HDFS-6764:

             Summary: DN heartbeats may become clumped together
                 Key: HDFS-6764
                 URL: https://issues.apache.org/jira/browse/HDFS-6764
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode
            Reporter: Daryn Sharp

DNs send heartbeats on a fixed schedule based on the last time a heartbeat was sent.  If the
NN takes longer to respond than the heartbeat interval then DNs do not sleep until the next
interval.  Instead, another heartbeat is immediately sent and all DNs begin heartbeating on
the same schedule.

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