Brandon Li created HDFS-5563:
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Summary: NFS gateway should commit the buffered data when read
request comes after write to the same file
Key: HDFS-5563
URL: https://issues.apache.org/jira/browse/HDFS-5563
Project: Hadoop HDFS
Issue Type: Improvement
Components: nfs
Reporter: Brandon Li
Assignee: Brandon Li
HDFS write is asynchronous and data may not be available to read immediately
after write.
One of the main reason is that DFSClient doesn't flush data to DN until its
local buffer is full.
To workaround this problem, when a read comes after write to the same file, NFS
gateway should sync the data so the read request can get the latest content.
The drawback is that, the frequent hsync() call can slow down data write.
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