Hexiaoqiao commented on issue #1028: HDFS-14617 - Improve fsimage load time by 
writing sub-sections to the fsimage index
URL: https://github.com/apache/hadoop/pull/1028#issuecomment-521548200
   @sodonnel for OIV tools, based on branch-2.7 I got the different result 
IIRC. unfortunately I do not dig it deeply at that time. I would like to test 
it again later and report it if meet some exceptions.
   > Two future improvements we could do in a new Jiras, are:
   > Make the ReverseXML processor write out the sub-section headers so it 
creates a parallel enabled image (if the relevant settings are enabled)
   > Investigate allowing OIV to process the image in parallel if it has the 
sub-sections in the index and parallel is enabled.
   +1.  Thanks @sodonnel 

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