ovj opened a new issue #773: Updates to HoodieRecord are missing during 
MergeHandle with ExternalSpillableMap 
URL: https://github.com/apache/incubator-hudi/issues/773
 
 
   MergeHandle uses ExternalSpillableMap for storing all new inserts to a file. 
Today during merge handle if number of records which we are adding to a file 
are a lot then ExternalSpillableMap may end up writing it to disk and future 
updates done to in memory copy of HoodieRecord will not be reflected into on 
disk copy. This creates duplicate key issue if we are using HBaseIndex. 
Creating this issue to address this.
   
   
https://github.com/apache/incubator-hudi/blob/master/hoodie-client/src/main/java/com/uber/hoodie/io/HoodieMergeHandle.java#L211
 Here we are updating HoodieRecord after adding to the map.
   
   cc @vinothchandar @bvaradar @n3nash 

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