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  1. HBase
  2. HBASE-25642

Fix or stop warning about already cached block

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      Our logs have as a fairly common occurrence:

      2021-03-05 22:24:31,034 WARN  [StoreFileOpener-foo-1] hfile.BlockCacheUtil: Caching an already cached block: blah.bub. This is harmless and can happen in rare cases (see HBASE-8547)
      

      If this is really harmless, why do we log? If it's not actually harmless, let's take another pass at fixing this situation.

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              apurtell Andrew Kyle Purtell
              ndimiduk Nick Dimiduk
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