I'm interested in distributed filesystems which have file's replicas. I read this sentences in the Hadoop definitive guide book.
*Multiple writers, arbitrary file modifications* Files in HDFS may be written to by a single writer. Writes are always made at the end of the file. There is no support for multiple writers, or for modifications at arbitrary offsets in the file.(*These might be supported in the future, but they are likely to be relatively inefficient.*) So, are you working to support for modifications at arbitarary offsets in the file now? What if some modifications succeed, but other's replicas modifications fail? How do I do? To support modification feature and to guarantee file system integrity at the moment, what are the matters that require attention for the developer. Please give me some ideas. -- 김재호 <http://www.petabytes.org/>
