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MapReduce >> mail # user >> Why journalnode need to reformat when upgrade


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Why journalnode need to reformat when upgrade
Hi all

   A info log  got my questions :

----------------------------------------------------------------------------------------------------
13/11/15 10:03:40 INFO namenode.FSNamesystem: Finished loading FSImage in
261 msecs
Re-format filesystem in QJM to [10.7.23.122:8485, 10.7.23.125:8485,
10.7.23.124:8485] ? (Y or N) Y
......
 ----------------------------------------------------------------------------------------------------
  I do want know what is the information aim at?
Regard.