Tsz Wo Nicholas Sze created HDFS-7264:
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Summary: Tha last datanode in a pipeline should send a heartbeat
when there is no traffic
Key: HDFS-7264
URL: https://issues.apache.org/jira/browse/HDFS-7264
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode
Reporter: Tsz Wo Nicholas Sze
Assignee: Tsz Wo Nicholas Sze
When the client is writing slowly, the client will send a heartbeat to signal
that the connection is still alive. This case works fine.
However, when a client is writing fast but some of the datanodes in the
pipeline are busy, a PacketResponder may get a timeout since no ack is sent
from the upstream datanode. We suggest that the last datanode in a pipeline
should send a heartbeat when there is no traffic.
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