Hi friends: I has two question. first one is: I use libhdfs's hflush to
flush my data to a file, in same process context I can read it. But I find that
file unchanged if I check from hadoop shell ―― it's len is zero( check by
"hadoop fs -ls xxx" or read it in program); however when I reboot hdfs, I can
read that file's content that I flushed again。 why ? can I hflush data to
file without close it,at same time read data flushed by other process ？
second one is: does once close hdfs file, the last written block is
untouched. even open that file with append mode, namenode will alloc a new
block to for append data? I find if I close file and open it with append mode
again and again. hdfs report will show "used space much more that the file
logic size"
btw: I use cloudera ch2 Thanks a
lottttttttttttttttttttttttttttttttttttttkanghua
