can i use hdfs in this scenery ?

[kang hua]

Hi Todd Lipcon:I am developing a log structure -like filesystem on hdfs . I 
hope data will not be lost when machine that client on hanppen to crash, so I 
hope to flush operation log to hdfs as soon as possible for roll forword when 
back from crash. However , operation log is small , So I flush it very 
frequently 。 I use hflush methodfor above scenery ?  It is resonable?    and 
Can I use hdfsAvailable method(or others) to get file lenght that I hflush to 
but not close ? 
kanghuaThansk you