Support hsync in HDFS
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Key: HDFS-744
URL: https://issues.apache.org/jira/browse/HDFS-744
Project: Hadoop HDFS
Issue Type: New Feature
Reporter: Hairong Kuang
HDFS-731 implements hsync by default as hflush. As descriibed in HADOOP-6313,
the real expected semantics should be "flushes out to all replicas and all
replicas have done posix fsync equivalent - ie the OS has flushed it to the
disk device (but the disk may have it in its cache)." This jira aims to
implement the expected behaviour.
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