Xiaoyu Yao created HDFS-7291:
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Summary: Persist in-memory replicas using unbuffered IO should
only applies to supported Linux version
Key: HDFS-7291
URL: https://issues.apache.org/jira/browse/HDFS-7291
Project: Hadoop HDFS
Issue Type: Sub-task
Components: datanode
Affects Versions: 2.6.0
Reporter: Xiaoyu Yao
HDFS-7090 changes to persist in-memory replicas using unbuffered IO on Linux
and Windows. On Linux distribution, it relies on the sendfile() API between two
file descriptors to achieve unbuffered IO copy. According to Linux document at
http://man7.org/linux/man-pages/man2/sendfile.2.html, this is only supported on
Linux kernel 2.6.33+. This JIRA is to limit the usage of sendfile() for lazy
persist only on Linux distribution with kernel version higher than 2.6.33. For
unsupported version, lazy persist will fallback to normal buffered IO.
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