[GitHub] [incubator-pegasus] neverchanje commented on issue #723: Proposal: Redesign of Pegasus Scanner

[GitBox <gi...@apache.org>]

neverchanje commented on issue #723:
URL: https://github.com/apache/incubator-pegasus/issues/723#issuecomment-826645906


   First of all, we use the default ByteWiseComparator because we design the key schema based on it.
   We design the hashkey length ahead of the hashkey bytes in order to prevent key conflict like:
   
   1. hashkey = a, sortkey = xxx
   
   2. hashkey = ax, sortkey = xx
   
   With the default compactor, the two keys are seen as distinct:
   
   ```
   01axxx
   02axxx
   ```
   
   So we chose this method, but didn't consider that one day we would need prefix filtering of hashkey.


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