What will happen if the box of hdfs client died with cached data?

[xiao li <xe...@outlook.com>]

According to the hdfs documents, the hdfs client will cache the data in local file system up to the block size before it send it to the hdfs cluster, until you close the file or flush it explicitly.
What will should we do if the box died for some reasons while it has cached data to prevent losing data?
Thanks
Xiao