zymap opened a new pull request, #4607:
URL: https://github.com/apache/bookkeeper/pull/4607

   ---
   
   # Motivation
   
   We observed numerous errors in the broker that failed to read the ledger 
from the bookkeeper; although the ledger metadata still exists, it was unable 
to read from the bookkeeper. After checking the data, we found the ledger 
located entry log was deleted by the bookkeeper. We have a data loss issue with 
the bookkeeper.
   
   The entry log file was deleted by the Garbage collector because the entry 
log file wrote a wrong file header.
   
   And there is an example that the shows the header is wrong:
   ```
   Failed to get ledgers map index from: 82.log : Not all ledgers were found in 
ledgers map index. expected: -1932430239 -- found: 0 -- entryLogId: 82
   ```
   


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