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HDFS >> mail # dev >> hsync is too slower than hflush

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hsync is too slower than hflush
Hi, all. Hadoop support hsync which would call fsync of system after 2.0.2. I have tested the performance of hsync() and hflush() again and again, but I found that the hsync call() everytime would spent nearly 50ms while the hflush call() just spent 2ms. In this slide(http://www.slideshare.net/enissoz/hbase-and-hdfs-understanding-filesystem-usage Page 18), the author mentions that hsync() is 2x slower than hflush(). So, is anything wrong? Thank you very much and looking forward to your help.

Best Regards,
Haosong Huang
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