Todd Lipcon created HDFS-4049:
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Summary: hflush performance regression due to nagling delays
Key: HDFS-4049
URL: https://issues.apache.org/jira/browse/HDFS-4049
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node, performance
Affects Versions: 2.0.2-alpha, 3.0.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Priority: Critical
HDFS-3721 reworked the way that packets are mirrored through the pipeline in
the datanode. This caused two write() calls where there used to be one, which
interacts badly with nagling so that there are 40ms bubbles on hflush() calls.
We didn't notice this in the tests because the hflush perf test only uses a
single datanode.
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