Vanlightly opened a new pull request #2909:
URL: https://github.com/apache/bookkeeper/pull/2909


   ### Motivation
   
   Throwing a NoEntryException from the entry logger
   for an entry that the index says should exist is
   unsafe. It can cause ledger truncation during ledger
   recovery. It only takes a single false NoSuchEntry
   response to trigger truncation.
   
   NoEntryException should only be thrown from inside
   ledger storage if the entry is not found in the index.
   
   ### Changes
   
   Do not throw NoEntryException from EntryLogger on failing to read entry from 
log file, throw IOException instead.
   
   Master Issue: #2908
   


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