Ming Ma created HDFS-9259: ----------------------------- 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]. -- This message was sent by Atlassian JIRA (v6.3.4#6332)