1 Chunk meta data not loaded and then Write sync failed.
   When I move a big file (for example, 4g) to kfs, the error may occur.
   And then it will cause lease expired and should be renewed, this will make writing slowly.

2 Retiring write problem
   It will occur this problem when write a file to kfs sometimes.
   Why a ops does not be prcessed in 5 min after it arrives?
   When this situation will occur?

  thank you!