Daryn Sharp created HDFS-6764:
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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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