Ming Ma created HDFS-9259:
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Summary: Make SO_SNDBUF size configurable at DFSClient side for
hdfs write scenario
Key: HDFS-9259
URL: https://issues.apache.org/jira/browse/HDFS-9259
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Ming Ma
We recently found that cross-DC hdfs write could be really slow. Further
investigation identified that is due to SendBufferSize and ReceiveBufferSize
used for hdfs write. The test is to do "hadoop -fs -copyFromLocal" of a 256MB
file across DC with different SendBufferSize and ReceiveBufferSize values. The
results showed that c much faster than b; b is faster than a.
a. SendBufferSize=128k, ReceiveBufferSize=128k (hdfs default setting).
b. SendBufferSize=128K, ReceiveBufferSize=not set(TCP auto tuning).
c. SendBufferSize=not set, ReceiveBufferSize=not set(TCP auto tuning for both)
HDFS-8829 has enabled scenario b. We would like to enable scenario c to make
SendBufferSize configurable at DFSClient side. Cc: [~cmccabe] [~He Tianyi]
[~kanaka] [~vinayrpet].
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